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• Why does audio stop when rewinding video collected using ffmpeg ?

  12 mai 2020, par Vlad F

  The resulting video correctly plays only sequentially. If you jump to an arbitrary point, audio and subtitles fall off.

  



  The timing of the video files are identical.

  



  ffmpeg.exe -y -i as.mkv -i hd.mkv -codec copy -map 1:v -map 0:a -map 0:s final.mkv


  



  Log - pastebin.com/pihPfHTq

  


• Python FFmpeg : Single static image coupled with audio outputs massive file size

  15 décembre 2019, par Cryptonaut

  I’m using this Python library to programmatically generate a video using a single static image (.PNG - 3.05 MB - 1920 x 1080) and an audio track (.WAV - pcm_s24le (24 bit) - 48000 Hz - 34.6 MB) as input.

  I’m using this technique to speed up the video generation process.

  However, the final file size of output_video_final is 2.33 GB. Considering my input file sizes (.PNG - 3.05 MB / .WAV - 34.6 MB), why is the final .MOV output so large ?

  Here’s my code :

      '''
  
      Generate .MOV using static image as input
  
      '''
  
      image = ffmpeg.input(input_image, loop='1', t='00:00:1', framerate='24000/1001', probesize='42M')
  
  
  
      output = ffmpeg.output(image, output_video,
  
      f='mov',
  
      vcodec='prores_ks',
  
      vprofile='3',
  
      pix_fmt='yuv422p10le',
  
      g='120',
  
      video_track_timescale='24000',
  
      movflags='use_metadata_tags',
  
      timecode='00:00:00:00',
  
      color_primaries='bt709',
  
      color_trc='bt709',
  
      colorspace='bt709',
  
      qcomp='1',
  
      preset='veryfast',
  
      bsf='prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709',   
  
      vf='scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt709')
  
  
  
      output.run()
  
  
  
      '''
  
      Generate .MOV using static image .MOV in previous output
  
      and combine with audio input
  
      '''
  
      audio = ffmpeg.input(input_audio, filter_complex='channelsplit')
  
      video = ffmpeg.input(output_video, t='00:02:06', stream_loop='126')
  
  
  
      output = ffmpeg.output(video, audio, output_video_final,
  
      vcodec='copy',
  
      acodec='pcm_s24le',
  
      audio_bitrate=bitrate)
  
  
  
      output.run()

• Concat three videos with one audio [duplicate]

  26 septembre 2018, par Михаил Безуглый

  This question already has an answer here :

  • FFmpeg concatenation, no Audio in Final Output
    
    1 answer
    
  • FFmpeg : concat multiple videos, some with audio, some without
    
    1 answer
    
  • Vertically or horizontally stack several videos using ffmpeg ?
    
    2 answers
    

  Thank you for coming here.
  I have three video clips (the first is 3 seconds, the second is 20 seconds, the third is 2 seconds), I connect them using the following command :

  ffmpeg -i opening.mp4 -i middle.mp4 -i ending.mp4 -filter_complex "[0:v] [1:v] [2:v] concat=n=3:v=1 [v]" -map "[v]" output.mp4

  Since all three videos do not have audio tracks, I do not need to include [a]. And then the day came when I needed it. I have an audio track,
  duration of 35 seconds(which is much larger than the output.mp4 video) and I need this audio to be connected to the whole video.
  1) Do I need to crop the video to the length that is obtained by merging all three videos ?
  2) Is it possible to do this with one command, or i need first have to concatetate all together with my command, and then merge video and audio track ?