[FFmpeg-devel] P/B - frames coeffs
g.milano87 at gmail.com
Sat Nov 19 15:09:38 CET 2011
I am decoding a video stream in h264 using ffmpeg, and printing out the DCT
coeff after dequantification. To corroborate this I am using VisualMpegPRO
and checking out wether coefficients per macroblock have the same value
(between ffmpeg print outs and VisualMpegPRO) and going over the order in
which they are stored.
I could check all this for I macroblocks: all coeff are stored in h->mb and
I noticed that DC coefficients are not dequantized. Why does this happen???
However, I couldn't conclude the same thing for P and B macroblocks (print
outs don't match with VisualMpegPRO results). Are DCT coeff stored in the
same structures for P and B macroblocks as in for I??? If this is so, how
are they stored?
Thanks in advance!
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