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• Extracting parts of video and make a new video with them [on hold]

  13 février 2014, par Filippo

  I need to extract parts of a video and make a video (in order to make a summary).
  My videos are mostly mpg, sometimes avi.

  I'm using ffmpeg to do it :

  Extraction : ffmpeg -ss XX -t XX -i video.mpg -vcodec copy -acodec copy partX.mpg

  Concatenation : ffmpeg -i concat:part1.mpg|part2.mpg|... -vcodec copy -acodec copy summary.mpg

  I have two problems :

  • ffmpeg only let me set position by time reference and not by frame number. I will prefere to set it by frame number, but it's not a big deal
  • the resulting video is...bad. The transitions between extracted parts are not smooth at all.

  What is the best way to do that ?
  I guess I need some kind of non-linear editing library : gnonlin, gtreamer-editing-services (but no package for Fedora 16 ?), MLT...

  But how I can do that easily ? (in preference in python)

  I can't find any good example.

  Thanks.

• FFMPEG Video to still images and back to video loss less

  4 novembre 2012, par Rigoni

  I'm trying to extract image from an uncompressed AVI video using ffmpeg with the command :

      ffmpeg -i sorce.avi -f image2 -pix_fmt bgr24 images/%1d.bmp

  All is ok, but now I need to revert these images back to a video file.
  I'm trying using this command :

      ffmpeg -f image2 -r 24 -i marked/%1d.bmp -y -vcodec ffv1 -pix_fmt bgr24 test.avi

  But, the output video is compressed and with bad quality.

  Is there any way to extract the images in RGB format and than back to a lossless video ?

  I also tryed to use -vcodec rawvideo, but the quality still bad.

  Best regards.

• Subtitles aren't being burnt into the video | embedding srt into video frames [closed]

  29 février 2024, par X3R0

  Describe the bug

  


  I'm trying to burn a subtitles.srt file onto the video (having the subtitle embeded within the frames themselves)

  


  To Reproduce

  


  both `input.mp4` and `subtitles.srt` are available to the WASM FFMPEG FS
const converted = await ffmpegRef.current.exec([
    '-i', "input.mp4", // Input File
    '-i', 'subtitles.srt',  // Burn subtitles into video
    '-vf', 'subtitles=subtitles.srt',  // Burn subtitles into video
    "output.mp4" // Output File
]);


  


  Expected behavior

  


  The Subtitles should be burned into the video.

  


  Desktop :

  


  

  • OS : Windows 10

  


  • Browser Chrome

  


  • Version 122.0.6261.94 (Official Build) (64-bit) (cohort : M122 Rollout)

  


  


  Additional context

  


  Example extract from the subtitles.srt file

  


  1
00:00:00,280 --> 00:00:01,379
Hi,

2
00:00:01,379 --> 00:00:01,679
and

3
00:00:01,679 --> 00:00:01,980
welcome

4
00:00:01,980 --> 00:00:02,200
to

5
00:00:02,200 --> 00:00:03,220
ClipDrop.

6
00:00:03,799 --> 00:00:03,919
Congratulations

7
00:00:03,919 --> 00:00:04,400
on

8
00:00:04,400 --> 00:00:04,719
being

9
00:00:04,719 --> 00:00:05,040
selected

10
00:00:05,040 --> 00:00:05,259
to

11
00:00:05,259 --> 00:00:05,480
do