[FFmpeg-user] read out DCT-Coefficients

[kapraf]

What about data in AVFrame.dct_coeff ? But I don't know what its structure
is, i.e., it's just a pointer to the matrix but I don't know where are
stored Y, Cb, Cr DCT coefficients for each macroblock. If you have any
information about that please let me know since I'm struggling with it
recently.

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