[FFmpeg-user] Poor quality output when converting avi to mp4

Ute Willmore uwillmore at remotegeo.com
Wed Jul 26 22:28:28 EEST 2017

Carl Eugen,

My supervisor told me that this happens only when we save the video to a
DVR after recording it, and then download it to a PC to play it. If the
video is NOT saved to the DVR, i.e. downloaded to the PC from the video
camera, the video is fine and conversion/scaling is no problem.

I hope this helps to narrow down the problem for you.
Thanks for filing the bug report.


On Tue, Jul 25, 2017 at 1:12 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com>

> 2017-07-24 20:55 GMT+02:00 Gyan <gyandoshi at gmail.com>:
> > As best as I can tell, ffmpeg does have issues with parsing non-standard
> > H.264 bitstreams. It's certainly not as resilient as other decoders.
> Could you elaborate?
> FFmpeg decoders (and demuxers) were written with the intent to
> read as many non-standard files as possible and this is what we
> have been experiencing (for a decade) - bugs such as the one
> described in this ticket are of course possible.
> Do you have (many) samples that fail with FFmpeg but work with
> other decoders?
> Or do you mean that error resilience for damaged (as opposed to
> non-standard) H.264 is not as good as expected? Use
> single-threaded decoding for improved error resilience with FFmpeg.
> (Multi-threaded error resilience is non-trivial, and multi-threaded
> decoding seemed - much - more important a few years ago than
> error resilience.)
> Carl Eugen
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