[Libav-user] motion vectors using FFmpeg gives lots of noise

[Taha Ansari]

I have a video recorded from an IP surveillance camera. Link:
https://www.dropbox.com/s/4gtcbge08nlv9rx/motion0.mp4?dl=0

I want to extract motion info, so I use following command:

ffmpeg -vismv pf -i motion0.mp4 -y output.mp4

This converts the original file, marking motion vectors as well (as
required). But the end result is: it is marking stationary places as noise
as well (random arrows everywhere).

I want to know why this is happening. I have already tried this command
with other video(s), and random noise does not show there.

Any help is much appreciated...
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