[FFmpeg-user] Visualize / extract motion vectors for VP8

Vadim Kantorov vadimkantorov at gmail.com
Tue Feb 5 20:42:52 CET 2013

I've learned to visualize motion vectors through "ffplay -vismv 1
video.avi" or to extract them through the "motion_val" field.

However, neither of the methods work when I use a VP8 video. I selected the
ffvp8 decoder through "avcodec_find_decoder_by_name". Both "motion_val" and
"mb_type" fields are empty.

Is there a way to access the motion vectors without hacking into ffvp8?

Vadim Kantorov

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