[Libav-user] Decoder detects wrong framerate

Carl Eugen Hoyos ceffmpeg at gmail.com
Mon Aug 20 00:18:36 EEST 2018

2018-08-19 19:22 GMT+02:00, Vasiliy Volkov <volk.vasiliy at gmail.com>:

> While working on application based on libav* we've encountered strange
> decoder behavior: it detects wrong input framerate when we specify more
> than 1 thread to it. So it looks like a bug, but maybe we do something
> wrong?
> The problem with framerate detected by decoder: when we set 1 decoder
> thread it detects framerate correctly, but when we set 2 or more it doubles
> the framerate.
> Here is a minimal code with h264 sample bitstream for reproduce such
> behavior: https://yadi.sk/d/SBC1mv_L3aNJKK

While H.264 timestamps (and therefore framerate) can be wrong with
FFmpeg (this is a long-standing issue), I always get "50fps" for the
given sample with current FFmpeg, no matter the number of threads,
so I suspect the issue is in your code.

Carl Eugen

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