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• 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()

• 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

  


• how to remove PTS gap within a file when transcoding with ffmpeg ?

  18 juillet 2017, par jsBaek

  i have a video which is from rtmp streaming.

  Since the broadcasting is on and off frequently,

  the archived file has PTS like below

  (assume that this is sec)

  0—10—20—30—40 120—130—140

  there’s discontinuity between 40 and 120 sec.

  duration of this file must be 60sec since there’s 80sec gap between 40 120.

  but when i transcoded this file, final duration became 140sec with 80sec of pausing parts.

  how can i transcode this file without "not existing" 80 sec so that output file became 60sec without redundant pausing 80 sec.

  i tried "+getpts" or "+igndts" options but they don’t work at all.