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New in 2.4.5
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What's new in 2.4.5?
• QuickTime dithering is now an option for color screens at 8bits or less depth.
QT dithering is slower than my fast dithering and uses more memory, but
looks a little better. The one great advantage it has is that is looks a lot
better when the picture is scaled larger.
• The format of the stored resources has changed. This should not affect you in
any way except that the first time you open your MPEGs, there'll be a slight
delay while the older resources are removed and the new resources created.
• Some bug fixes were made in the code that handles MPEGs with multiple sequence
headers (these are very rae except on CDi disks.)
• Some data structures were moved into temp mem. The main benefit is that
large CDi MPEGs that previosuly required you to up the Sparkle partition
to 5MB should now usually run OK in the default 2MB partition.
• Audio and video sync for CDi now works a lot better though it's still not perfect.
What's new in 2.4.3?
• There are some MPEG encoders that create (for who knows what reason) an MPEG
stream that starts not with a valid sequence start code but with a bunch
of zeroes. Sparkle will now display such MPEGs.
• Certain users (mainly BBS people and cross platform people) asked for
an option to not have resources created automatically. This is now
under the prefs menu.
• For a specific (and rare) type of image block, 2.4.2 would display a
slightly garbled image. Now fixed.
• When the sound of an MPEG/sound combo is muted, the sound data is no longer
read off disk while playing which reduces the CPU load a little.
• Parsing of AIFF files is now a little more robust. More general forms of
AIFF compression that MACE should be supported. If anyone has AIFF files
compressed in an alternative format (ACE or IMA) pleas try test them and
tell me if they work or don't.
• WAV files are now directly parsed and played IF YOU have Sound Manager 3.1.
As always I have zero tolerance for obsolete system software. Do not waste
my time by asking me to support WAVs under Sound Manager 3. Sound Manager
3.1 is avilable in beta form to some users and will be available in
general form soon enough.
• Now supports QT sound overdriving. To overdrive a sound track, shift-click
on the speaker button of the movie controller.
• The caching of disk data as it's read has been modified as has the main
event loop. This has some effect on reducing the occasional long pauses
that happen between frame displays.
• The suffixes and file types used by Sparkle have all been changed in accordance
with Phade's suggestions for sanely designed MPG suffixes.
• The MPEG splitter can now (with some caveats) read CDi disks. See the ReadMe CDi
doc for more details.
What's new in 2.4.2?
• Bug fixes:
In 2.4.1 the 68K version often didn't play. Damn uninitialized variable.
• Now supports the .M15 and .M75 MPEG suffixes. Also uses a better guess for
the frame rate when opening a movie with an invalid frame rate.
• Revamped MPEG playback prefs dialog which removes obsolete options, adds a
new option and is a little more cohesive.
• Playback is slightly faster with half pixels off and about 7% faster with
half pixels on. Essentially this means that the cost of using half pixels,
is not much more than the cost of not using it.
• Under certain rare conditions in previosu versions, the color conversion
tables were destroyed too soon and images were displayed in random
colors. I hope I have now fixed this.
What's new in 2.4.1?
• Yet more speed: 16bit playback is now more than THREE times as fast as
it was. Playback of resized images is MUCH faster.
NOTE: Some of the code changes I made to get this speed may well cause
the code to run slower on 68K macs. I am not going to work hard to
maintain two code bases for PPC and 68K. All my effort is going into
optimal PPC speed, with no concern for 68K.
As a result of the changes to make 16bit playback faster, two things are
now a little different:
(a) 16bit display in 16bit-fast mode is now higher quality (and the same
as the hybrid 16/24 bit option which will go away when I fix the
playback prefs dialog)
(b) If you move the window across two screens image quality may be
substantially reduced. I figure this doesn't matter much--you shouldn't
do that anyway cause it causes so much slowdown.
People interested in speed may be interested in the following:
on my 7100/80 with an accelerated 24bit card, 40% (!!!!!) of time in
24bit playback is now spent copying data to the screen. This is why we
need PCI and a faster bus!!!
• Now that I have some extra speed at my disposal, I have altered some of the
internal code (parsing and IDCT) to correctly handle some of the most
finicky details of the MPEG spec. The result is to slow the code down by
about 5% but, under certain circumstances, to improve the quality of the
image somewhat. Now that I have the CPU to do a good job, I want to
make the images Sparkel displays as good as possible, rather than the
somewhat amateurish quality they have sometimes had.
• Bug fixes to 2.4.0
* With 2.4.0 I switched to a new link system and forgot to weak link
against SpeechLib. This caused problems for people without SpeechManager
on their macs. Now fixed.
* The PPC assembly I was using to build a 24bit pixmap worked OK for my
video card but built a pixmap incompatible with the HPV motherboard
video on PPCs. This should now be fixed.
* There were a few typos in the PPC assembly I wrote for 2.4.0 resulting
in occasionaly visual glitches in the image. These are fixed.
• FINALLY: I now save the index Sparkle builds when it first opens an
MPEG, saving the lengthy startup while the index is calculated. Along
with this I now also allow a frame rate to be saved with the MPEG. This
is especially useful for the common MPEGs floating around the internet
that have been encoded with a non-standard MPEG rate like 6 or 8fps.
Along with this comes a new menu item under the edit menu for stripping
the resource fork from an MPEG. Read the ReadMe 2nd file for why you
might want to do this.
• Command-Y is now a shortcut for the Set Frame Rate menu item.
• In the past sometimes error messages were not reported to the user because
of a design flaw in the Think Class Library which I use to handle that
sort of thing. (Gee, thanks, Symantec.) I have made some patches to TCL
to try to rectify this---hopefully now you will always get an error message
when something goes wrong (especially when opening files) rather than
being left in the dark.
• Backward realtime playback sometimes played frames out of order. No
longer.
• If both MPEG and QT movies were open and memory ran low, Sparkle could
lock up. Fixed.
• The user interface to the MPEGSplit app was slightly altered, to give better
error message feedback, and to remove some confusion about what to do when
an error occurs.
What's new in 2.4.0?
• Bug fix: I made a dumb error in 2.3.4 or 2.3.5. The symptons varied
depending on your machine but most commonly were that if you grew the
document larger than a certain size the window would go blank.
• Bug fix: If you did some fiddling with the MPEG prefs, swapping bit
depths and such, you could get your windows to become munged. This bug
has been around for a year or so and no-one ever reported it (you have to
do a very precise set of things to trigger it) but now it's gone.
• Speed boost: I did profiling of the PPC code and based on that made
some changes to the C code, as well as moving certain loop routines into
PPC assembly. The resultant code can be as much as twice as fast as
Sparkle 2.3.5 if everything is right. But not everything is in PPC
yet---I only had time to do what I thought were the most common cases.
In particular only the 4x4 IDCT is in PPC, not the 8x8 IDCT, and
only 24bit display code is in PPC, not 8 or 16 bit code.
Those will come in time. There are also some other major algorithmic
modifications in the wings to boost speed, but those are further away.
Also going to PPC assembly has meant the app is now built with a crazy
quilt of Symantec C++ versions 7, 8 and Toolserver. The point is that I
am poised to switch to using the very high quality (and phenomenally
slow) C/C++ compilers from say Motorola at some point in the nearish
future. With luck these would give a speed boost that's reasonable and
yet easily achieved.
What's new in 2.3.5?
• I found that there are certain MPEGs floating around (examples are
flower.mpg and byrncad.mpg) that are not unusually MPEG encoded.
Specifically they contain a B-frame as the second frame, and it's not
clear how the I-frame before that B-frame should be interpreted---as
a past or as a future predictor. An MPEG like this would crash Sparkle,
now it does not.
Be warned, however, that the MPEGs I've seen like this are not very well
encoded---it seems that the encoder used shows a general lack of
knowledge of how MPEG frames are re-ordered when decoding, so the
resultant MPEG can be pretty awful in areas where there is a lot of
video motion.
• Bug fix related to releasing memory when Sparkle is closed.
• Sparkle does not work when Aladdin Shortcut (an INIT like Boomerang) is
installed. As far as I can tell, this is a problem with Shortcut.
I wrote to Aladdin a long time ago asking about this and never received
a reply. I then wrote a few days ago and have not received a reply. If
you use Shortcut and want this fixed, complain to Aladdin and tell them
to speak to me.
What's new in 2.3.4?
• Misc bug fixes---mainly on rare occasions things were set up to
trap to the debugger on an error. These situations are now
invalidated for release builds.
• MPEGSplitter 1.02 fixes:
* Code for testing if volumes were locked or not is now more robust.
* Code for selecting directories is more robust.
* Quite a bit faster.
What's new in 2.3.3?
• Bug fix: Sparkle now runs OK without Speech Manager present (just like
in 3.2.1 and earlier versions).
• Bug fix: Sparkle was writing to memory location 4 during startup.
The problem was some variables were being initailzed in the wrong
order. This caused a message for people who had LOBE installed.
What's new in 2.3.2?
• The new code for auto arranging windows when new files are opened
wasn't quite correct. Now fixed.
• Many people asked if I could return to picture based MPEG and QT
encoding (as opposed to time based encoding). To satisfy everyone I
now support both. To get time based encoding, choose a frame rate
of zero when encoding MPEGs or movies. (On the latest versions of QT
a frame rate of 0 is called Best in the popup list).
Also any frame rate is supported for MPEG encoding. Be aware,
however, that by choosing a frame rate not supported by the MPEG
standard you are creating an MPEG file that may not play on all
MPEG decoders, especially those based on special purpose hardware.
• QT encoding using a specified data rate (only possible with the Cinepak
encoder) didn't work correctly. Now fixed. If you have a PowerMac I
would recommend using this option.
What's new in 2.3.1?
• The bug where opening some MPEgs gave an error -2014 is fixed.
• Sound now works with looping.
• MPEG encoder bugs fixed:
* For sources that are not a multiple of 16 in width and height, motion
vectors could go in the range between the real height/width and the
height/width rounded up to a multiple of 16, which is not allowed by
the DIS. (Every other encoder I know also screws up this way, but we
might as well get it right.)
* When skipping macroblocks in P & B pictures, DC DCT coefficients weren't
being reset to midgrey.
* When skipping macroblocks in P pictures, motion vectors were not being
reset to zero.
* Half pixels now work again (by mistake I had disabled them in 2.3.0).
• The code for auto arranging windows across screens when you open a new
document has been changed. This new code is a little more flexible and
I hope it'll be more likely to come up with optimal placements of new
windows.
• The progress bar now flips down automatically when you're encoding then
hides itself once encoding is done.
• The way low memory situations are reported has been changed. This should
work a little better with QT. Let me know if it behaves strangely.
• Selecting portions of a movie is now supported. Select a portion of a
movie using the shift key in conjunction with the mouse button or
arrow keys. You can use a selection for two purposes:
* You can limit playback to within the selection.
* Only the selection will be used when creating a new QT/MPEG movie.
What's new in 2.3?
• The MEG2Decoder had problem where it screwed up display of MPEGs that were
not a multiple of 16 in width. Fixed
• A serious problem with MPEGEncoding that often produced garbage MPEGs is
fixed.
• All encoding (QT and MPEG) is now done based on time. not frame number.
This makes audio support much easier.
• Preliminary audio support has been added for MPEGs. See the ``Readme Sound''
file for details.
• Opening QT movies (especially long ones) is faster.
• Some minor user interface tweaks.
• Some cosmetic bugs fixed.
• You can now choose the frame rate at which to play MPEGs and PICT
pseudo-movies.
What's new in 2.2.3?
• Bug fixes:
* Under certain circumstances an MPEG would stop playing just before the
very last or first frame was displayed.
• Speed tweaks.
What's new in 2.2.1?
• Bug fixes:
* In very special circumstances (a slightly corrupt MPEG that was missing
a SequenceEndCode, I was writing a few bytes over the end of a memory
block. This lead to crashes on 020/030 class macs.
* When encoding an MPEG, I (very stupid, I know) landed up aliasing the file
reference number associated with the MPEG file, then closing that
fileReferenceNumber twice, something Apple warn is not a great idea.
* At startup if the user had a corrupt prefs file and tried to quit,
Sparkle would crash---I was ForgetHandle()ing a resource handle. Grrr!
* Fixed Yet Another problem with the SC++ BEL macros. This one involved
crummy Symantec code for testing if an object's on the stack that fails
when threads are active.
* Was setting the bkPixPat of a window to NULL when closing it--dumb.
* Was disposing of a handle that was disposed of in some library code
written by someone else. Taligent have a nice naming convention for
libraries to prevent this sort of thing---it can't happen a moment too
soon.
* Fixed a few anomalies I noticed in the way things are drawn on 1 and 2
bit screens (like anyone uses Sparkle on one :-) ).
• Tweaks to make the progam feel snappier:
* Wherever I was calling FlushVol() to dump the disk cache to disk, I now
do that asynchronously. Async IO is also used in a few other places. It's
not yet used for reading files, but that will come.
Note that QuicKeys, for reasons that (I'll be charitable and not state my
true feelings) make no sense to me, disables asynchronous IO so you won't
see any effect. If you think this sucks, call CE Software and tell them.
* I now preload QuickTime stuff at startup to avoid latencies later when
I need it.
* When building a PICT pseudo-movie, a much faster algorithm for
scanning for the files of the movie is used.
* When displaying a PICT pseudo-movie, the disk should be accessed rather
less often than before
• MPEG encoding has been sped up. I have dropped the Berkeley
encoding algorithms and used my own algorithms. (Where these are similar to
the Berkeley algorithm, I use the same name simply for consistency.)
My algorithms are not only faster but produce slightly smaller files
and use more elegant, shorter code---a perfect win win win situation.
The Technical Readme file contains brief descriptions of the properties
of the new algorithms.
What's new in 2.2?
• The usual cleanups of course.
• Substantially improved building of the index when an MPEG is opened.
The new code is about five times the speed of the old code, and the
interleaving of CPU and file access is done more carefully.
This should make windows popup more snappily when you open an MPEG file.
(Unfortunately if you're pulling the MPEG off a slow hard drive, CD-ROM
or network this speed is limited anyway by the file system, not the CPU
calculations.)
• I should have had a TRY/CATCH handler in place for if an error occurred
while the dialog boxes were being popped up for saving an MPEG or QT
movie. This could have led to crashes (more likely just strange error
dialogs), but is now fixed.
• If you ran Sparkle in the background on an 8-bit color screen while a
foreground app kept creating a number of different palettes, then when
Sparkle was quit an error message could occur (I was running down an
array associated with each new palette destroying items but I should
have run down the array starting from the end not the beginning of the
array.)
• Thread synchronization is now done ``properly'' using a number of
semaphores. This replaces the old method of using a very carefully
orchestrated dance to move between threads. The new method is
theoretically safer (and makes it a lot easier to alter the code) but
being new I may have forgotten something in one routine or two. Bear
with me and report any strange bugs---machine locking up, strange error
messages, garbled images.
• Some (very strange) QT movies may have multiple superimposed video tracks.
In this case when Sparkle created an MPEG or QT movie from the original
QT movie parts of the image you saw could have random colors in them.
This is now fixed.
• Other strange QT movies could be encoded with not a fixed frame rate but
every frame lasting a different amount of time. When creating an MPEG
nothing can be done about that, but when creating a new QT movie I allow
a frame rate of zero which will create all frames at whatever time they
should be created at.
• When a movie was being encoded to some other format the movie controller
was not drawn with all decorations suppressed. Now it is.
• When an MPEG window was opened said window displayed some flicker as pieces
of it were drawn. This has been cleaned up. Likewise for PICT-sequence
windows.
• In a few places certain variables that should gave been initialized to NULL
or zero were not. In theory if an exception ocurred in these blocks of
code a crash might occur. Anyway now fixed.
• A bug in CustomGetFile() in the MacOS leads to a loss of 64 (or so) bytes
every time a file selection dialog box is displayed if there is an `ictb'
associated with the dialog box. (It looks like the `ictb' is read in and
DetachResource'd() then the handle created that way is never disposed of.)
This was fixed by removing the `ictb's associated with these dialogs.
The same holds true for `mctb's if the dialog contains a popupmenu. I would
guess it also holds for `cctb's, but it does NOT hold for `dctb's.
• New look---windows with grey background, can shrink video as small as you like.
a startup splash screen.
• If you decide partway through startup you don't want to run Sparkle, hit
command-. (command-period) to abort.
• PowerMac native (and very fast). A 6100/60 gives three times the
playback rate of my Quadra 610.
• Rewritten MPEG encoder to use way less memory.
• MPEG decoding code has been restructured so as to present a block of
code that can easily be dropped into other environments. This will form
the basis for various QT components/drivers I'd like to write to give
much tighter integration with QT.
• All large memory allocation is done through temp mem. Basically this
means you shouldn't ever need to increase the size of Sparkle's
partition but you can open and save files limited only by all the
memory on your mac.
• Foundations have been laid for AppleScripting. You probably can't do
any useful scripting with this release but that will change soon.
• User interface has been tweaked a little. I hope you like the changes.
• The most common problem with the 2.1 versions was that the preferences
file would become corrupted leading to random errors. The prefs file
handling has been changed in this version to make that much less likely.
If this release gives you problems, destroy the Sparkle prefs file then
try again.
• Many many bug fixes.
What's new in 2.1.5?
• Somewhere in the cleanups of code of the last few revs I landed up
dividing some color motion vectors by two too often resulting in
misaligned color on MPEGs created without half-pixels. This is fixed.
What's new in 2.1.4?
• Many many internal cleanups of the code as part of my cleanup for
PowerPC. If these cleanups broke anything, please tell me.
• There was in bug in some earlier versions so that when you opened Sparkle
on a system without QuickTime rather than quitting gracefully it could
crash when quitting. Now fixed.
• Minor changes have been made to better support Macintosh Easy Open.
• When saving an MPEG or QT movie in an alternative form the play button
of the movie controller is hidden which I think looks better.
• When a movie saving was in progress and was paused, if the relevant
window was covered then uncovered (generating an update event)
Sparkle would hang. This was because Sparkle tries to switch to
a thread that has been put to sleep. This has been fixed.
• If an MPEG were opened and immediately command-S were typed, once the
saving was done it was possible for Sparkle to popup an error message.
The problem was that the very first update event for the MPEG window,
used to initialize some variables, would be discarded is a save were
begun immediately. The code used when an MPEG is opened has been fiddled
a little to prevent this.
• I was asked by some people doing Sparkle for batch conversion of MPEG
and QT for a way for Sparkle to indicate when it is done converting a
file. I won't have AppleScriptability in place for a few months but I
did put in a quick hack to allow this for users of QuicKeys. Look in the
ReadMe 2nd file for details (do a search for QuicKeys).
• In the code I added to 2.1.3 to support halfPixels I made a typo which
under rare circumstances would set the color of a block incorrectly or
(if you were unlucky) crash. This is fixed.
• Memory used for MPEG encoding MPEGs has been dramatically reduced.
For the case of encoding MPEGs with only I-frames, the memory
required is 1/6th of what was required in 2.1.3 and earlier versions.
For MPEGs using P and/or B frames, memory required is about .4 of
what required earlier (actually 15/36). These memory requirements
will be shrunk further in later versions of the code.
• The MPEG Playback prefs dialog has cleaned up a little and behaves a
little more intuitively. Now the options under the 8bit color section
always apply when the screen is 8bit color, regardless of the 8bit
dithering method used.
There is now a tryout button. Click there to see how the changes you
make alter what you see.
• Two further options have been added to the MPEG Encoding dialog to give
you a little more control over this behavior.
You can now specify whether half-pixel encoding is used or not
(in the past half-pixels were always used).
Likewise you can specify whether or not to compare against raw
reference frames or reference frames decoded from the MPEG stream being
created (in the past decoded reference frames were always used).
What's new in 2.1.3?
• There was a bug in 2.1.2 that prevented one (usually) from playing MPEGs
in play all frames mode. So sorry about that. This is fixed.
• I have (FINALLY) fiddled the P and B frame calculations to be EXACT at
highest quality settings (ie when saving an MPEG to a secondary file.)
The last few touches involved doing all the finicky details specified
in the MPEG DIS (which in the worst case can involve compositing a single
image point from values spread over nine different places. The differences
are very subtle but are visible---large areas of smooth texture in
particular in the past tended to develop a slight granularity which is
now cured.
This code involved coding a huge number of special cases and I may have
made a mistake in a case or two. I have run all my example MPEGs through
and they look good but if you see a block that looks misaligned or has a
different color from what it should have, please tell me so I know I
need to fix a mistake.
• There was a bug in 2.1.2 and earlier versions where, if an MPEG was playing
and you closed the window there was a small chance of an error message
popping up. This bug was due to what's called a race condition.
It should have been fixed, but if not please tell me.
What's new in 2.1.2?
• In 2.1 when a window was first opened and the Video menu selected, the
menu showed Palindrome looping as on even though it was not. This is fixed.
• In 2.1 I had a serious (crashing) possible bug that could occur when a
window was closed. This was because the life cycles of video encoding
threads and video playing threads are different. I must rationalize
these to one model, but till then I've applied a quick and dirty fix.
• Long complicated pathways through about six auxiliary functions, used when
threads died and a holdover from the Sparkle 1.x days, have been removed to
use a much simpler virtual function based scheme. This is slightly faster
and, more important, much simpler hence, hopefully, less buggy.
• Deactivating/activating of the ``Change file type to MPEG'' radio button in
the open file dialog was a little erratic. This has been fixed.
• Rudimentary balloon help has been added.
• When memory is very low and a window starts being opened, but fails
partway, the cleanup code was slightly wrong. Now fixed.
• Improved the display on 4-bit color screens. It was very blocky.
• Changed the progressbar to display properly on 4-bit color screens.
The two colors used for foreground and background were being mapped onto
the same color.
• Change the progress bar to update itself better when parts of the window are
uncovered. Before parts would be drawn quite a while before other parts
giving a result that looked silly.
• Added a menu option to allow operation without ever yielding time to
WaitNextEvent. If you don't need to give time to background applications,
use this option for faster, less jerky, playback.
• Speech manager code used to announce a delay when encoding an MPEG
could, if timing was just wrong, crash. I think the problem was that the
Speech Manager was building internal data structures on the stack, and
that stack disappeared when the the MPEG encoding thread died. Anyway
I've modified the speech code so this can't happen.
• Discovered a serious problem in my video encoding code. When an MPEG
window was resized while it was being converted to another MPEG or QT
movie, the result could be a munged image for a few frames. The fix
involved a major structural readjustment of Sparkle---ALL video
manipulations now pass through ThreadEvent queues---but the result is
that for the first time I feel confident about the theoretical
underpinnings of Sparkle---that while minor bugs may remain, there are
no conceptual nasties waiting to bite me.
• When windows are resized, the resizing is done in a manner that leaves
no gunk in the window in the moments before the resizing is complete.
• I discovered yet another way in which things could crash---The MacOS call
DrawPicture() will crash if it runs out of memory---thanks Apple.
There's nothing I can do about this, so what I did do is try to trap
situations that form a pattern of using DrawPicture() while memory is
getting lower and warn you that memory is running low. This doesn't
catch all situations but catches some.
• The play/pause button no longer toggles between states when you start a
movie saving or pause it. This is because what I was doing to get this
to work in QT 1.x no longer works nicely in QT 2.0 --- flickering frames
result. I guess this is a consequence of DataPipe or something.
Anyway I've replaced this with indicators in the title bar.
• I made a few changes to allow easier more sensible playback of QT movies that
consist of only sound. This is at present rudimentary but is a start.
What's new in 2.1?
• Yet again memory management has been fiddled with. Previous tinkering with
memory management was to ensure that my own code never crashed for lack
of memory. Building on top of that, I've tried to ensure that calls to
the operating system won't crash for lack of memory. This is more
difficult because, obviously, I don't know just what the memory
requirements of each call are. However I've done the best I can, and
the resultant code seems even more robust than 2.02.
• The scheduling has been revamped based on the threading. I now make
intelligent decisions about which thread to schedule when. Also calls to
the main event loop, which were very expensive in time, have been cut
dramatically. the result is about a 15% speed boost all round.
• MPEG playback is now based on genuine timing, not on simply playing
every frame as fast as possible. Like QuickTime movies, you can play
MPEGs back in real time or play every frame. I also now support the
movie controller variable speed controls obtained by control-clicking
on the forward/backward stepper buttons.
• You can now set QT and MPEG movies to loop.
• You can now grow or shrink MPEG and QT movie windows.
• The cursor is now hidden when movie playback starts, until you move it.
This seems to be a reasonable compromise for preventing flickering cursor
when starting a movie using the keyboard, but atill allows the user
easily to find the cursor when needed.
• When files are opened, windows are now tiled in a vaguely intelligent fashion,
attempting both to use the available screens with best depth, and to
avoid window overlap.
• Dragging windows is now aligned to a grid of optimal window placement. This
gives better movie playback.
• Can now show/hide the progressPane, movie controller and frame count with the
tab key using tab, shift-tab, control-tab.
• The drawing of the progress bar has been altered slightly, to fix cosmetic
defects and to make the appearance closer to that of the movie controller.
• Support for MPEGs with a pixel aspect ratio not equal to one has been added.
At present this isn't switched on because some dumb MPEGs out there
have a bogus aspect ratio encoded in them. However if someone wants
this feature right away, I'll add a user interface to access it.
• Support for MPEGs with multiple sequence headers has been added, not
that I have ever seen such an MPEG.
• Playback is now much faster through a variety of mechanisms. However
this has, as a consequence, lower quality playback. You may set through
preferences which optimizations you're willing to accept for faster
playback and which you're not willing to accept. All optimizations are
turned off when converting an MPEG to another format so that you'll get
the best possible quality.
Playback speed is now about 1.6 times faster for 24 bit screens, about
2.5 times as fast for 8 bit grey screens, and improvements in between for
other screen depths.
• Special purpose display code is used for
24 bit, 16 bit and 8 bit color screens and 8 bit grey screens.
All other screens are sent through one of the above special purpose codes
then use QuickTime to convert the pictures to the appropriate screen depth.
Obviously special purpose code is faster. If I get lots of calls for
screen depths other than the one's I'v supported directly, I'll look into
adding more special purpose code.
• In 2.0 I broke the support for adding files called name.mpg, but without
a file type of MPEG so you could open files of that type but nothing
would happen. Sorry about that. It's been fixed.
• When files are opened and are not of the default Mac types (for example
files imported from a UNIX box, or files on a PC CD ROM) Sparkle uses
more intelligence in deciding whether to open these files as MPEGs, QT
movies or pictures. If this mechanism is still not general enough for
some users (I image mainly users sharing data with PCs), let me know.
• The ``official'' MPEG encoding pattern of IBBPBBPBBPBB is now a pre-defined
option. Some people asking for this as a pre-defined option have given me
slightly different patterns as the ``official'' pattern. However what I
have used is, to the best of my knowledge correct, and I'm assuming these
people who wrote to me simply made typos. If you have comments on this,
please mail me.
• I twiddled the RGB to YCrCB conversion code that is the first step in
encoding MPEGs. The changes won't affect anyone except people creating
MPEG movies whose width or height is odd, in which case the very last
row or column of pixels will have more accurate color. The important
change, however, was that I no longer read beyond the end of some arrays,
so I'm ready for when Apple give us protected memory a year from now.
• Under certain rare circumstances, depending on the number of frames int the
input file and the IPB pattern used, the last frame or two of the input
would not be saved in the output MPEG. This is fixed.
• MPEG encoding now can specify a frame rate (in the past this was always
30 fps). Sure the range of choices is limited---blame the people who
wrote the MPEG spec---those are, basically, the only choices.
1) Can people with MPEG hardware verify that this works for me?
On my mac with 10fps max playback, it's tough to see if this works.
2) There are some frame rates I've omitted that are very close to those
I give, for example 29.97 fps. At some point i'll get the finicky
time right to support these but it's a pretty low priority compared
to sound.
What's new in 2.01?
• Implemented padding YUV macroblocks with a repeat of the last value of
each YUV triplet when macroblocks at the edge of a frame spill over
the edge. The most common case of this is a 120 pixel high movie with a
macroblock height of 128. In the past this spillover was filled randomly.
The result of this is that MPEGs created are about 15% smaller.
• Some diddling with the code used by the IDCT algorithm gives a speed boost
of about 5% to both playing and encoding MPEGs.
• Fixed a serious bug that prevented you from playing an MPEG if you started
playing it then interrupted it. A nice byproduct of this is that I got
jogging of MPEGs fully operational. You can now repeatedly view a section
of the MPEG by hitting command-right-arrow then command-left-arrow to keep
the MPEG moving forwards then backwards.
• Altered the alert popped up when the Thread Manager is not present to make
it more palatable to corporate and institutional users.
• Fixed the MPEG buffering which would give problematic results for very small
MPEGs (say three frames or less).
• Finally went through all resources, marking them purgable or not and removing
the unnecessary ones.
• Fixed the "PBBIBB" default frame set to make it correspond to the user view
of things, not my programmer's view.
• Fixed a bug that prevented a temporary movie created by the movie controller
handling an MPEG file from being destroyed.
• Fixed two bugs in the Think Class Library dealing with the loading of dialogs
then manipulating them without setting their memory blocks to non-purgable.
• Fixed a long-standing bug in the MPEG player buffer-handling code that
would cause the MPEG frame index to be incorrect if it was created while
memory was short. This probably never caused problems except for very long
MPEGs.
• When converting a QT movie into a different movie form, the dialog that comes
up asking you for compression options will have the frame rate and key
frame rate set at what the original movie used, sparing you from having to
guess. I will eventually have this working across all file conversions,
not just movie-->movie.
• The Think C 6 compiler contains a bug when performing code-motion optimization
on complex loops. If you run through the assembly it produces in this case,
it performs some very nifty register coloring and creating induction
variables for the loop. It then leaves out one crucial instruction to
update one of the induction variables each pass through the loop and so
the code is garbage.
As far as I can tell, this only affects one function in my code and I have
used a #pragma there to prevent it happening, but the fact that bugs like
this exist in the compiler is a little worrying.
• Revised all memory allocation so that it is more likely to not to use up all
memory reserves and leave nothing for toolbox.
• Found an especially nasty bug involving grabbing frames from a QT movie
which, when memory ran low, would leave the system GrafPort/GDevice
environment in an inconsistent state.
• Revised all uses of GWorld to use tempMem, but fallback to local heap if
tempMem is unavailable.
• Altered the strings used to popup error messages at startup if QuickTime
is not available. These got mixed up when I moved code around.
• The code to build the MPEG index when an MPEG is opened would run out of space
when a very large MPEG was opened---one of a thousand frames or more. Now
memory is allocated for this a little more flexibly.
• Fixed a bug I inserted when I changed from Sparkle 1.6 to 1.7. I rewrote the
Berkeley motion vector code to speed it up and in the process made one
little typo, shifting a variable right by 1 not 2. The effect of this, in
Sparkles 1.7 and 2.0 was that, under very rare occasions, blocks of color
would appear a few pixels off from where they should be. The only place I
ever saw this was three or four frames of the MPEG sales110.mpg.
This is not related to a separate problem.
The motion estimation code in the MPEG encoder (at present the Berkeley code
with practially no changes) is not perfect. It sometimes creates
blocks that appear to be wildly off from where they should be (by quite a few
pixels). This is not very obvious in real life, but is very obvious in animation.
This is largely a quantization artifact---it goes away if you lower the
quantizations. But obviosly you don't want to do that always, just where
necessary, so you really want a smarter quantizer that is adaptive.
I'll work on issues like this as soon as I can.
• When converting a movie with sound to MPEG or QT, occasionally pops of sound could
be heard. This is fixed.
• When converting movies with very low keyframe rates (say 20 or more dependent
frames per keyframe) occasionally the display of the movie would get confused
and appear to alternate between two different frames. This is fixed.
What's new in 2.0?
• The structure of the code has been completely altered to be based on
threads. This makes it much easier for me to add new features to the code
while having it retain MultiFinder friendliness.
• Now opens and plays QT movies.
• Now can create MPEG files. General conversion from
{QT or MPEG}--->{QT or MPEG} is possible.
• Many minor changes to the way files are opened, named and such.
• Makes minor use of the speech manager if installed.
• You can now play MPEGs backwards.
What's new in 1.71?
• The progress bar now updates itself properly at the very end of saving
each frame to Quicktime. It also draws itself better on b/w screens.
• More of the default QT movie player keystrokes now work.
• The app notes if an MPEG file has many errors and if so warns you that
it has probably been transferred to the mac incorrectly.
• I have incorporated a workaround to make Sparkle work with the QT VM
extension. However I do not recommend you use the two together. If you do
use QT VM you will find Sparkle's memory usage a little less efficient
than without using QT VM. This is because of the way QT VM works.
• Fixed a bug that caused unusually sized MPEGs to display as distorted.
• Sparkle should now cope a little better with low memory situations.
• Added a small tweak to improve drawing on 16bit screens under low
memory conditions.
• Uses the most recently released version on the floating windoid.
• I have learned of an app that will convert QT to MPEG on the mac. It's
not the easiest thing to use and I recommend this only for people
who really need this, not for people who just want to play around.
See the README file for details.
What's new in 1.7?
• Opening files is much faster.
• Fixed the size of the checkboxes in the Open File dialog to the correct
size for all those millions of people who use Chicago as their system
font cause they have no sense of aesthetics. Oops.
• Now when Sparkle changes the file-type of an file, the Finder will update
the icon immediately, instead of forcing you to open and close the
folder to see a new icon. Thanks to Jamie McCarthy for telling me how
to do this.
• Added an "About Sparkle" dialog box to quieten the constant stream of
complaints about this.
• Changed the way progress is reported. I think the new scheme feels
rather more elegant. (If you have a fast machine and only use small
MPEGs, you may not notice this change much.)
• Adde random access. You can now use the step backward stepper, or
simply click in movie controller where you want to go. All standard
movie controller clicks and keystrokes are supported.
• Restructured the internal code vastly. This is what took most of the
time and while it doesn't directly help you users, it gives me
a framework that's much easier to build on. For example it should be
trivial to add Apple Event support when I get round to that.
• Three or four minor bugs were squelched, mostly involving Sparkle crashing
when it encountered MPEGs with invalid data in them.
• Now quits gracefully when started on a 68000 mac like a Classic, rather
than crashing. I'm sure lots of people care about this.
• Added better multi-tasking support. This takes two forms.
One is that the length of the timeslices Sparkle uses before giving up
the CPU are now absolute times. Before they were numbers that worked
well for my SE/30, but probably not optimally for slower or faster
machines.
The second is that you can now context switch out of Sparkle while it
is doing slow QT conversions (especially converting to Compact Video).
The way I have implemented this is not wonderful, but the best I can
do given the present way the code is structured. The next version
will use the Thread Manager and will do this rather better.
This second form of timeslicing is done through the
SetSequenceProgressProc() call which is new in QT1.6 and which is why
I now require use of QT1.6. Also QT does not yield the CPU very often,
and (as far as I know) there is no way to make it yield more often.
So while your machine is no longer completely frozen as it does its
conversion, it's still not too pleasant to use for typing. I can't do
much about this---complain to Apple and tell them to change this part of
QT, or better yet the whole OS.
What's new in 1.6?
• I became tired of continually having to explain to people about mac
file types, so I wrote a file filter function for the Open File dialog
box which displays ALL files with a .mpg suffix. This should make use a
lot easier for novices.
• Fixed a bug that involved writing to NULL.
• Fixed a bug that prevented IBP type MPEGs from rewinding when they
reached the end and the play button was hit twice.
What's new in 1.5.2?
• I was disposing of a handle twice (specifically I was disposing of a
pixmap and then its colortable, not realizing that DisposPixMap took
care of the colortable for me.) Thanks to Dan Sears for pointing this out.
I never noticed a problem due to this bug, but it's probably good to
have killed it.
Whats new in 1.5.1?
• One part of my speed optimizing code was not being initialized properly.
This caused a very specific type of MPEG file to show parts of its first
frame as greenish blobs. Now fixed.
• The code to detect errors in a corrupted MPEG file has been made even
more robust. Substantially better recovery from such errors, by
rebuilding the lost parts of a frame from the previous frame, has been
introduced. Thanks to a wonderfully corrupt MPEG file I pulled off
usenet with about 15 misc errors in it for pointing out new and
ingenious ways to fail.
• New icons, courtesy of Richard Lim in Britain. I hope you like them.
You will have to rebuild the desktop to see them.