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• create video with fluctuated background color and drawbox with fluctuated color ?

  27 mai 2019, par Wang

  Is there anyway to create a video with fluctuated background color choosing from a list for example [R, G, B] the background color along time will be R,G,B,R,G,B .... I might use nullsrc with geq. But seems the geq is quite slow which apply to each pixel.

  I would also like to change the color of drawbox too, is there any easy way to do it ? I knew we might be able to use openclsrc but it seems overkill for this simple task.

  Update, for drawbox I found a way, which is kind of abuse the timeline editing :

  ffmpeg -f lavfi -i smptebars=r=30:d=30:size=800x600 -vf "drawbox=enable='eq(mod(n,3),0)':x=0:y=0:t=20:c=red,drawbox=enable='eq(mod(n,3),1)':x=0:y=0:t=20:c=green,drawbox=enable='eq(mod(n,3),2)':x=0:y=0:t=20:c=blue" /tmp/test_box.mp4

• ffmpeg copy stream results in output file with twice the bitrate [closed]

  19 août 2023, par Karl-Johan V. Jensen

  ffmpeg noob here so sorry if I missed something fundamentally. I have a video from a camera which is not recognized by browsers for playback.

  


  To fix I ran it through "ffmpeg -c copy" in an attempt to fix the meta-data - it works but the bit rate is different in the output file.Command run :

  


  >ffmpeg -i c:\tmp\some-file638280751798189644.mp4 -c copy c:\tmp\output-copied22.mp4


  


  Here is the output of ffprobe on the two files. Notice that the bitrate has gone from 869 kb/s to 1676 kb/s. Is there a way to prevent the "-c copy" command variation to not change the bitrate ?

  


  C:\src\internal_audit_project\ffmpeg-n6.0-latest-win64-gpl-6.0\bin>ffprobe -hide_banner -i c:\tmp\some-file638280751798189644.mp4
Input #0, mpeg, from 'c:\tmp\some-file638280751798189644.mp4':
  Duration: 00:02:35.46, start: 4085.173844, bitrate: 869 kb/s
  Stream #0:0[0x1e0]: Video: hevc (Main), yuvj420p(pc, bt709), 2688x1520, 25.08 tbr, 90k tbn

C:\src\internal_audit_project\ffmpeg-n6.0-latest-win64-gpl-6.0\bin>ffprobe -hide_banner -i c:\tmp\output-copied23.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'c:\tmp\output-copied23.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf60.3.100
  Duration: 00:01:20.42, start: 0.000000, bitrate: 1676 kb/s
  Stream #0:0[0x1](und): Video: hevc (Main) (hev1 / 0x31766568), yuvj420p(pc, bt709), 2688x1520, 1675 kb/s, 18.05 fps, 25.08 tbr, 90k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]


  


  Attempted the following command. Expected the bitrate to be the same but the meta-data of the video file to be re-written, allowing me to play the output file on a browser based player.

  


  >ffmpeg -i c:\tmp\some-file638280751798189644.mp4 -c copy c:\tmp\output-copied22.mp4


  


• Heroku build failed & state changed from crashed to down

  5 décembre 2020, par Cal9233

  2020-12-05T08:10:45.000000+00:00 app[api]: Build started by user calvin.m71@hotmail.com
2020-12-05T08:11:38.587758+00:00 app[api]: Deploy 4fca112e by user calvin.m71@hotmail.com
2020-12-05T08:11:38.587758+00:00 app[api]: Release v6 created by user calvin.m71@hotmail.com
2020-12-05T08:11:38.635964+00:00 heroku[web.1]: State changed from crashed to down
2020-12-05T08:11:41.000000+00:00 app[api]: Build succeeded
2020-12-05T08:32:12.000000+00:00 app[api]: Build started by user calvin.m71@hotmail.com
2020-12-05T08:32:50.304709+00:00 app[api]: Release v7 created by user calvin.m71@hotmail.com
2020-12-05T08:32:50.304709+00:00 app[api]: Deploy 4fca112e by user calvin.m71@hotmail.com
2020-12-05T08:32:52.000000+00:00 app[api]: Build succeeded


  


  Before it was that there was no ffmpeg buildpack on heroku, I added it with
https://elements.heroku.com/buildpacks/jonathanong/heroku-buildpack-ffmpeg-latest

  


  But now I just get state changed and see no errors. Any help would be greatly appreciated !