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  • Unknown Decoder in ffmpeg

    17 mars 2020, par user6782547

    I have a script, that is called from Plex after the recording of a movie. This script just crops the black borders of the movie.

    When I call it directly from the command line, it works flawlessly. But when Plex calls it, it says : "Unknown decoder", even if I call it with the key word "auto" for the decoder.

    There’s another problem, that might give a hint to solve my problem. It also says : "WARNING: library configuration mismatch". (Only when being called from Plex.) This is probably, because I compile ffmpeg from the Debian source package (so that I can add the whole CUDA functionality).
    I had a look at the dynamic linker path, but it is empty on the command line.

    What is so different, when this command is called from Plex, than when I call it manually from the command line ?

    Thanks for any help

  • Ending a video segment on a non-key frame while preserving codec

    13 août 2020, par painfulenglish

    I want to extract a segment from the middle of a video while keeping the original encoding. I understand that I need to start that segment on a keyframe. However, I would think that it should in principle be possible to end the segment on an arbitrary frame. Can anyone confirm that and provide an example for how to achieve this using ffmpeg ? It seems that -c:v copy enforces key frames at both ends and the same is true when using the -segment option.

    


    My current commands have the form (times and frames are examples and do not match)

    


    ffmpeg -ss 00:00:05 -i test.mp4 -to 00:00:10 -c:v copy test_cut.mp4


    


    or

    


    ffmpeg -i test.mp4 -codec copy -map 0 -f segment -segment_frames 80,140 test_%03d.mp4


    


  • ffmpeg with multiple live inputs [closed]

    9 juin 2013, par maddanio

    we are trying to get ffmpeg to combine multiple live streams into one. In principle we got it to work by mosaicing the streams like so :

    ffmpeg -rtsp_transport tcp -r 25 -i rtsp ://root:password@192.168.178.91:554/axis-media/media.amp \
    -rtsp_transport tcp -r 25 -i rtsp ://root:password@192.168.178.92:554/axis-media/media.amp \
    -filter_complex "[0:0]pad=iw*2:ih[a] ;[a][1:0]overlay=w" ...

    the problem though is that ffmpeg seems to start the input streams at significantly different times, so that there is about a 1 second shift between the streams, that remains throughout. Now we do have correct time stamps (pts) on both streams. Can we somehow tell ffmpeg to respect those and use them to align the streams correctly ?

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