[FFmpeg-devel] Accessing compressed domain data

[guido manfredi]

Hi,

I'm running a research project using H.264 video codec.
I would like to use ffmpeg in order to retrieve frames ( I-frames especially
) in compressed domain.
My goal is to get the DCT coefficients of each I-frame, with only partial
decoding of the frame.

Is there a way to stop frame decoding before IDCT, so i can retrieve DCT
coefficients and btw save computation time ?

I suppose i should change some lines in h264.c : hl_decode_mb_internal(), is
that right ?

Thanks for your help,

Guido