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Sur d’autres sites (15417)

  • Python/FFMPEG command line issues

    1er mars 2019, par 12hys

    I have a problem with running an FFMPEG command from within a Python script. When I run the following command from the terminal, I can stream video and audio from my attached webcam (Logitech C310) and output to file "out.avi" without any errors.

    ffmpeg -f alsa -i default -itsoffset 00:00:00 -f video4linux2 -s 1280x720 -r 25 -i /dev/video0 out.avi

    When I run the same command in a Python script below,

    def call_command(command):
    
    subprocess.Popen(command.split(' '))
    

    
call_command("ffmpeg -f alsa -i default -itsoffset 00:00:00 -f video4linux2 -s 1280x720 -r 25 -i /dev/video0 out.avi")

    it gives me the error :

    Input #0, alsa, from 'default':
    
  Duration: N/A, start: 1317762562.695397, bitrate: N/A
    
  Stream #0.0: Audio: pcm_s16le, 44100 Hz, 1 channels, s16, 705 kb/s
    
[video4linux2 @ 0x165eb10]Cannot find a proper format for codec_id 0, pix_fmt -1.
    
/dev/video0: Input/output error

    Could anyone shed some light on what could be going on here ? I’ve tried using os.system() as well as subprocess.call() and it gives me the same errors. I’m not sure where to start on what could be going wrong here. I tried searching for the "video4linux2 Cannot find a proper format for codec_id 0, pix_fmt -1" error, but couldn’t find anything consistent.

    I’ve also tried putting the "ffmpeg -f..." command in a shell script "test.sh", and giving it executable permissions. I then open terminal, and run "./test.sh", and it works. When I try calling the command "./test.sh" from within my Python script, I’m left with the original error as before. This is the Python command I tried with the test.sh script :

    subprocess.call(["./test.sh"])

  • Python/FFMPEG command line issues

    5 octobre 2011, par 12hys

    I have a problem with running an FFMPEG command from within a Python script. When I run the following command from the terminal, I can stream video and audio from my attached webcam (Logitech C310) and output to file "out.avi" without any errors.

    ffmpeg -f alsa -i default -itsoffset 00:00:00 -f video4linux2 -s 1280x720 -r 25 -i /dev/video0 out.avi

    When I run the same command in a Python script below,

    def call_command(command):
    
    subprocess.Popen(command.split(' '))
    

    
call_command("ffmpeg -f alsa -i default -itsoffset 00:00:00 -f video4linux2 -s 1280x720 -r 25 -i /dev/video0 out.avi")

    it gives me the error :

    Input #0, alsa, from 'default':
    
  Duration: N/A, start: 1317762562.695397, bitrate: N/A
    
  Stream #0.0: Audio: pcm_s16le, 44100 Hz, 1 channels, s16, 705 kb/s
    
[video4linux2 @ 0x165eb10]Cannot find a proper format for codec_id 0, pix_fmt -1.
    
/dev/video0: Input/output error

    Could anyone shed some light on what could be going on here ? I've tried using os.system() as well as subprocess.call() and it gives me the same errors. I'm not sure where to start on what could be going wrong here. I tried searching for the "video4linux2 Cannot find a proper format for codec_id 0, pix_fmt -1" error, but couldn't find anything consistent.

    I've also tried putting the "ffmpeg -f..." command in a shell script "test.sh", and giving it executable permissions. I then open terminal, and run "./test.sh", and it works. When I try calling the command "./test.sh" from within my Python script, I'm left with the original error as before. This is the Python command I tried with the test.sh script :

    subprocess.call(["./test.sh"])

  • m3u8 on ios and safari, firefox

    9 octobre 2013, par user2741735

    I'm implementing the HTTP Live Streaming protocol. I have successfully created .ts and .m3u8 files using ffmpeg and mediastreamsegmenter(using terminal) from IP Camera input. Now, when I play these files on ios using MPMoviePlayerViewController the m3u8 file doesn't play. Do I need to do some additional stuffs to play these files so that the simulator and browser could understand those file types.

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