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• configure : pass windows-path to nvcc whenever cygpath is available

  26 février 2019, par Timo Rothenpieler

  configure : pass windows-path to nvcc whenever cygpath is available
  It might be using cl.exe on Windows, which does not understand Unix-Paths.
  Signed-off-by : Timo Rothenpieler <timo@rothenpieler.org>
  

  • [DH] configure

• ffmpeg and windows command line

  6 janvier 2013, par Kasper DK

  I am trying to use ffmpeg for windows to convert thousands of images and sounds to a single video file.

  ffmpeg -i apples.jpg -i oranges.jpg -i orangessound.wav -i bananas.jpg -vcodec mpeg4 test.avi

  My delphi program generates the command line as a string, and I use shellexecute to call it.

  But is it true that a command line cannot be longer than 8191 characters ? If so, can ffmpeg read the parameters from a file instead ?

  It is not possible in this case to rename the pictures with consecutive numbers

• 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 !