[FFmpeg-user] Asking for help about FFmpeg

mohammed bey ahmed khernache mohbeyinfo at gmail.com
Sat May 5 09:15:38 EEST 2018

Thank you for your reply.
Yes, I don't need an output video. I just want to decode a video at 25 fps
and then calculate the miss rate. So I don't want to skip anything.


                        Mohammed BEY AHMED KHERNACHE
                                PhD student at Lab-STICC
                      Université Bretagne Sud, Lorient, France
                 mohammed.bey-ahmed-khernache at univ-ubs.fr

                             mohbeyinfo at gmail.com


On Sat, May 5, 2018 at 1:39 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> 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>​ -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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