[FFmpeg-user] Asking for help about FFmpeg

Carl Eugen Hoyos ceffmpeg at gmail.com
Sat May 5 02:39:34 EEST 2018


2018-05-04 20:02 GMT+02:00, mohammed bey ahmed khernache <mohbeyinfo at gmail.com>:

> When I try to decode a video which is encoded with HEVC
> (using ffmpeg) at a certain  fps (e.g fps=25), the result is a
> decoded video but at a different fps.

This sounds as if your problem is that your output video
has a different fps than your input video.

> How can I decode a video at exactly 25 fps, even if I get
> high miss rate ?
> I am using this command for decoding:
> ffmpeg -benchmark -i <file_name>‚Äč -f null out.null

But this command does not produce an output video...

Or are you only discussing the decoding speed?
FFmpeg generally decodes as fast as possible,
depending on your hardware (and video resolution), it
is possible that real-time decoding is not possible.

There are options to skip the loopfilter, skip B-frames
and even skip P-frames to speed up decoding:
-skip_loop_filter all
-skip_frame bidir / -skip_frame noref
-skip_frame nokey

Carl Eugen


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