[FFmpeg-devel] Google Summer of Code participation

Reimar Döffinger Reimar.Doeffinger
Sat Mar 28 14:29:11 CET 2009

On Sat, Mar 28, 2009 at 01:55:38PM +0100, Thilo Borgmann wrote:
> Reimar D?ffinger schrieb:
> > On Sat, Mar 28, 2009 at 12:20:32PM +0100, Thilo Borgmann wrote:
> >   
> >> no. 12: "16-bit Interplay Video Decoder"
> >> Sounds interesting and as there is a working 8-bit decoder, wich throws 
> >> some errors if operating on the 16-bit demo file, there seems to be a 
> >> good starting point. Unfortunately, the section about 16-bit opcodes is 
> >> far from useful, if opcodes would have to be changed, this task becomes 
> >> very difficult...
> >> http://wiki.multimedia.cx/index.php?title=Interplay_Video
> >>     
> >
> > I doubt the opcodes changed much, though the code to implement them will
> > probably be quite different, since it (probably) operates on 16-bit
> > data, I doubt there are dsputil functions for that.
> > You can extract the video frames into separate files via:
> > ./ffmpeg -i interplay-logo.mve -an -vcodec copy -copyinkf -f image2 test%04d.raw
> > You can then try decoding a single one like this:
> > ./ffmpeg -f image2 -vcodec interplayvideo -s 432x320 -i test0001.raw test.bmp
> > Though you will have to comment out some of the interplayvideo code that
> > expects a palette first - I assume that the 16 bit variant does not use
> > a palette...
> >
> >   
> Thank you for these hints!
> May be, I will inspect this issue later, as this seems to be a thing 
> where I can also support the project, but for the time being, I decided 
> to get on with the CorePNG problem.

Probably a good choice, we do not have automated regression tests for
that interplay format yet, and due to this I have not yet improved the
huge amount of needlessly complex code in it either. So there is a
chance that task will be easier to do in the near future.
Still if anyone wants to work on this I'll try to give them hints on how
to "reverse engineer" this.

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