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

[Vadim Kantorov]

Hi,
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?

Thanks,
-- 
Vadim Kantorov