[FFmpeg-devel] [PATCH]v308 and yuv4 encoders and decoders

Derek Buitenhuis derek.buitenhuis at gmail.com
Fri Dec 30 19:41:19 CET 2011

On 30/12/2011 1:24 PM, Carl Eugen Hoyos wrote:
> Then it is probably the language barrier that makes it impossible for me to
> understand your last mail (both parts).
> Perhaps you could try to rephrase?
> Thank you, Carl Eugen

So I checked libquicktime's source code. The part you copied the ^0x80
from is yuv2. yuv2 can have signed chroma (i.e. can have a negative
value), and that's why it xors with 0x80. yuv4 has unsigned chroma, so
I do not think you should be xoring with 0x80.

Can you, say, compare output of libquicktime with your

- Derek

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