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MacWorld 1996 July
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Macworld (1996-07).dmg
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Sparkle245
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ReadMe CDi
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1995-07-23
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The MPEGSplitter that comes with this version of Sparkle can now handle
CDI disks. However I have only just added this and it is not perfect.
The problem with CDi disks is that the data format of the MPEG files on
the disk makes use of sectors with extra padding that have to be removed
before the file can be decoded. QuickTime 2.1 contains a Data Handler
component that does this, so this readinf of CDI disks will only work on
systems with QuickTime 2.1. You'll have to wait until that is released.
The next problem is finding out which is the MPEG file. The one and only
CDi disk I have has a bunch of files on it, but the two that are MPEG files
have a suffix of .DAT. Because of that, I have set the MPEGSplitter file
filter to accept files with a suffix of .DAT.
However suppose you have a CDi disk with a file on it with a different
suffix, say .MVX. The MPEGSplitter will not recognize this suffix and will
not disply the file in the Open File dialog box. So you have to tell me
if there are alternative suffixes out there for CDi MPEGs.
The alternative to this is to allow files with any suffix to appear in
the File Open dialog box but that's nasty because the dialog box becomes
cluttered with junk.
The third problem is that you'll be splitting these files to a hard disk.
You may want to have up to a gigabyte free. The MPEG video part will
probably take about 400MB. The MPEG audio will be about 80MB which will
expand to about 500MB when you turn it into an AIFF file. The good news is,
of course, that disks are cheap---a GB should cost you about US$350.
The splitting may take two or three hours during which your mac is useless
for anything else so don't try this when you're impatient to do something
else.
Once you have your video and (optionally) audio you can view with Sparkle.
The index building will take five or ten minutes, but
only has to be done once. Then the text track is built, about a minute, and
then you're set---you can play your video.
CDi quality is MUCH better than any other MPEG I have seen. However it seems
to posterize a lot more on a 16bit screen than net MPEG video.
The most serious problem is that the MPEG audio seems be set at a time offset
from the video and so when playing the result is a serious disparity between
them---a lag of maybe a minute. With luck I'll find a way to fix this in
the next release.
Many thanks to Frank Hauptmann who sent me a CDi disk giving me something
to experiment with to get this to work.