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• lavu/timer.h : add Linux Perf API support

  2 septembre 2017, par Clément Bœsch

  lavu/timer.h : add Linux Perf API support
  Refer to "checkasm : use perf API on Linux ARM*" commit for the
  
  rationale.
  The implementation is somehow duplicated with checkasm, but so is the
  
  current usage of AV_READ_TIME(). Until these implementations and
  
  heuristics are made consistent, I don't see a way of sharing that code.
  Note : when using libavutil/timer.h, it is now important to include
  
  before any other include due to the _GNU_SOURCE requirement.
  

  • [DH] libavutil/timer.h

• How to restream an RTSP stream without processing anything on linux computer ?

  16 août 2016, par user2365252

  I am working with Embedded Linux machine which can get the RTSP stream from other source. Now if I configure my FFMPEG and try to restream it, the CPU usage reaches very high. This probably is due to Embedded Hardware capability.

  Is there any possible way we can simply restream the incoming stream with out processing it at all using any type of library ?

• FFmpeg : Windows vs Linux issues

  16 octobre 2022, par Chris

  I have run into an issue that I am pretty sure I have narrowed down to FFmpeg.

  


  I have a Flask app that restreams live streams using FFmpeg.

  


  ...

@app.route("/play/", methods=["GET"])
def play():
    def streamData():
        try:
            with subprocess.Popen(
                ffmpegcmd,
                stdin=subprocess.DEVNULL,
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
            ) as ffmpeg_sb:
                while True:
                    chunk = ffmpeg_sb.stdout.read(1024)
                    if len(chunk) == 0:
                        break
                    yield chunk
        except:
            pass
        finally:
            ffmpeg_sb.kill()

    return Response(streamData())

...



  


  I am using the following command.

  


  ffmpeg -loglevel panic -hide_banner -i <url> -vcodec copy -acodec copy -f mpegts pipe:</url>

  


  When I run my Flask app on Windows, both VLC and TVHeadend play the piped output perfectly.
However under Linux only VLC will play the piped output. I can get TVHeadend to play the stream from Linux, but it requires me to enable the AV Library option in TVHeadend, which I want to avoid. I have tested this using WSL (Ubuntu) and Docker (alpine + Ubuntu) on my Ubuntu server where the app will live.

  


  I can only assume its because FFmpeg behaves differently between Windows and Linux ? I have tried several different version of FFmpeg... So I don't think its a version issue.

  


  The version of FFmpeg I am currently using on Windows is this one https://www.gyan.dev/ffmpeg/builds/ but I experienced the same success on older versions, so again, I don't think its a version number issue.

  


  Can anyone suggest how I can go about finding out what the cause is ?
Is it possible that some default values differ between Windows and Linux ?

  


  Any advice is appreciated !