Re: [FFmpeg-user] ffplay error
> 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 wrote: > 2018-06-17 22:40 GMT+02:00, Mohammed Bey Ahmed Khernache < > mohbeyi...@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 > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffplay error
2018-06-17 22:40 GMT+02:00, Mohammed Bey Ahmed Khernache : >> 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 ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffplay error
Yes exactly. > 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. > 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. > You are doing performance tests, right? Yes, exactly. Thank you. On Sun, Jun 17, 2018 at 10:26 PM Carl Eugen Hoyos wrote: > 2018-06-17 21:16 GMT+02:00, Mohammed Bey Ahmed Khernache < > mohbeyi...@gmail.com>: > > > I am trying to play (decode) a video with *ffplay*. Unfortunately, > > I got this error, given below. > > Can anyone guide me to fix this issue? > > You have told us in the last thread that ffplay does not work > with video via ssh which I don't consider very worrying. > > Anything wrong with using ffmpeg (which to the best > of my knowledge works fine via ssh) to do performance > tests? You are doing performance tests, right? > > Carl Eugen > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffplay error
2018-06-17 21:16 GMT+02:00, Mohammed Bey Ahmed Khernache : > I am trying to play (decode) a video with *ffplay*. Unfortunately, > I got this error, given below. > Can anyone guide me to fix this issue? You have told us in the last thread that ffplay does not work with video via ssh which I don't consider very worrying. Anything wrong with using ffmpeg (which to the best of my knowledge works fine via ssh) to do performance tests? You are doing performance tests, right? Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
