[FFmpeg-user] ffplay error

[Mohammed Bey Ahmed Khernache]

>  Did you try another application that uses sdl?
Yes, I tried VLC, I also got problems.
I think about using Gstreamer, but I am looking for how to use it to do
decoding.

You are right. I agree with all your comments. But, I still don't know what
the source of these issues is.

Thank you

On Sun, Jun 17, 2018 at 11:17 PM Carl Eugen Hoyos <ceffmpeg at gmail.com>
wrote:

> 2018-06-17 22:40 GMT+02:00, Mohammed Bey Ahmed Khernache <
> mohbeyinfo at gmail.com>:
> >> ffplay does not work
> >> with video via ssh which I don't consider very worrying.
> >
> > This time, I am connecting the board directly to the screen
> > via Micro-HDMI, and I got the same issue. That's why, I
> > am sure that problem didn't come from ssh connection.
>
> Did you try another application that uses sdl?
>
> >>  Anything wrong with using ffmpeg
> >
> > FFmpeg works fine, without any problem. But, it can not do anything to
> > reach the requested framerate (fps). For example, if a video is encoded
> at
> > 25 fps, FFmpag can decode it at 5 fps if we use for example only one
> core,
> > or at 60 fps if we use 8 cores. Therefore, FFmpeg decodes at the capacity
> > of the hardware. I consider this as a constraint, because I can not
> > calculate miss rate which is an important metric to evaluate a video
> > decoder.
>
> I may misunderstand but please believe me that ffplay is nearly
> unsuitable for performance tests, many people use ffmpeg -i
> input -f null - to measure libavcodec (and libavformat) performance.
> You can specify what number of threads libavcodec should use for
> decoding, both when using ffplay and ffmpeg.
>
> In your example, libavcodec is not (nearly) fast enough to decode
> the given video in real-time using one cpu core, from what you write
> it is possible using multiple cores. While decoding (h264) often
> scales badly, using more than one core is not unusual, especially
> to reach a given performance.
>
> Please remember not to top-post here, it is considered rude.
>
> Carl Eugen
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