[Ffmpeg-devel] lzw compression in tiff encoder (qualification task for GSoC)

Michael Niedermayer michaelni
Fri Apr 6 18:38:58 CEST 2007


On Fri, Apr 06, 2007 at 04:53:27PM +0200, Baptiste Coudurier wrote:
> Hi
> Michael Niedermayer wrote:
> > Hi
> > 
> > On Fri, Apr 06, 2007 at 03:30:43PM +0200, Baptiste Coudurier wrote:
> >> Hi
> >>
> >> Bartlomiej Wolowiec wrote:
> >>> Hi,
> >>> As a supplement to my qualification task for GSoC I implemented LZW 
> >>> compressor. I think that my code is fast, universal and it can be easily used 
> >>> in other encoders. My implementation use hash table with simple hash function 
> >>> (I've used LZW prefix code and xor to calculate new hash value). So, I'm 
> >>> sending two files: one with lzw encoder (lzw.patch) and one with patch to 
> >>> tiffenc.c (tifflzw.patch). 
> >> Good, you may be interested in using your lzw encoder with gif also,
> >> which atm does not use lzw compression.
> >>
> >> I also quickly tested tiff encoder, and unfortunately it does not play
> >> in quicktime, if you can have a look.
> > 
> > i think tiff in QT support is very low priority ...
> That is a suggestion, and you already know that my goal differ.

yes but my feeling says that this is a QT bug not a ffmpeg-tiff bug
generall IMHO QT is very unreliable at best for playing anything but apple
developed stuff and tiff falls in this category i think


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I do not agree with what you have to say, but I'll defend to the death your
right to say it. -- Voltaire
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