[Libav-user] Extract the count of particular macro block types(I, P and S) from the frames

[manu sitara]

How can I extract the count of particular macro block types(I, P and S)
from the frames in the video (H.264 and MP4)?
Also, I would like to extract the prediction residual of each of the P and
B frames (computed from its corresponding reference frame) in the video
from the encoded version itself while the package is decoding it.
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