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  • ffmpeg how to make same streams for videos

    30 septembre 2022, par bogdaryan

    The documentation says that

    


    


    All files must have the same streams (same codecs, same time base,
etc.)

    


    


    I tried this, I thought it would help to make the same streams for all videos

    


    ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -filter_complex "[0]setdar=16/9[a];[1]setdar=16/9[b];[2]setdar=16/9[c]; [a][b][c]concat=n=3:v=1:a=1" output.mp4


    


    Is there any way to make all video the same streams to do then by the method with txt file ?

    


    ffmpeg -f concat -safe 0 -i mylist.txt -c copy mergedVideo.mp4 


    


    It would be very convenient, first do the conversion in one stream all the videos, then take their paths and combine. Just if I immediately do concat through the method with txt, some parts of the video just freezes the screen. I read, and they said to do same streams (same codecs, same time base, etc.)

    


  • Revision 62da0bf162 : Make reset_frame_context an enum. In vp9, [0] and [1] had identical meaning, so

    8 septembre 2015, par Ronald S. Bultje

    Changed Paths :
     Modify /vp10/common/entropymode.c


     Modify /vp10/common/onyxc_int.h


     Modify /vp10/decoder/decodeframe.c


     Modify /vp10/encoder/bitstream.c


     Modify /vp10/encoder/encoder.c



    Make reset_frame_context an enum.

    In vp9, [0] and [1] had identical meaning, so merge them into a
    single value. Make it impossible to code RESET_FRAME_CONTEXT_NONE
    for intra_only frames, since that is a non-sensical combination.

    See issue 1030.

    Change-Id : If450c74162d35ca63a9d279beaa53ff9cdd6612b

  • fluent-ffmpeg How to make video rendering synchronous with code ?

    12 avril 2020, par wongz

    I want to make the code run only after ffmpeg has finished rendering the videos. Currently, the code runs faster than the videos can render.

    



    videos.forEach((vid, i) => {
  ffmpeg(`${process.cwd()}/video/tmp/${vid}`)
  .outputOptions(['-r 30', '-filter:v scale=w=720:h=1280', '-crf 20'])
  .save(`${process.cwd()}/video/tmp/${vid}`)
  .on('end', ()=> console.log(`Video ${i} rendered`));
});
console.log("Fully Completed");


    



    The console shows :

    



    Fully Completed
Video 0 rendered
Video 1 rendered


    



    The execution should be opposite. How can I make the code wait for video to finish rendering before continuing ?

    


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