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• m3u8 contains only the last indexes of generated files

  5 février 2018, par Blurry Script

  this is the generated m3u8 file :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:11
  
  #EXT-X-MEDIA-SEQUENCE:1372
  
  #EXTINF:10.427089,
  
  720p_1372.ts
  
  #EXTINF:10.427100,
  
  720p_1373.ts
  
  #EXTINF:10.427089,
  
  720p_1374.ts
  
  #EXTINF:10.427089,
  
  720p_1375.ts
  
  #EXTINF:9.009011,
  
  720p_1376.ts
  
  #EXT-X-ENDLIST

  this is the command I used

   ffmpeg -i film.avi -hls_time 4 -hls_segment_filename test/720p_%03d.ts test/720p.m3u8

  my question is why the m3u8 file contains only the last ts indexes, as there are 1376 of them, but only 1372-1376 were written in the file

• How to replace all frames of video to one image ?

  8 février 2018, par YuriyPryyma

  I have some film
  I want to replace all frames from that video to my static image.
  So that video duration, resolution(width, height), sound and other properties stay the same.

• ffmpeg : concat videos and images

  23 mai 2016, par Yosko

  I have 2 videos (same resolution, same encoding) files that I want to concat and I want to insert some text for 3 seconds between them, as a splitter. I’m doing this with ffmpeg on Windows.

  Optional ideas that I would be interested in :

  • avoid reencoding the video in the process
  • having a fade in / fade out at the intersection of each part

  For now, I made the text as an image (but I am open to other suggestions). Let’s say I have :

  • video1.mp4 : 6:33
  • splitter.png (same resolution as video1.mp4)
  • video2.mp4 : 16:44

  I have tried a few things, but I always end up with the same problem : the video is 23:20 (video1 + 3 seconds + video2), but the 3 seconds gap is just the last video1 frame frozen instead of my image/text...

  Any Idea what I did wrong or how I should achieve this ?

  Here is what I tried so far :

  Method 1 : image to video

  Turn the image into a 3 seconds mp4 film, then concat (demuxer) it with the others :

  ffmpeg -loop 1 -f image2 -i splitter.png -r 30 -t 3 splitter.mp4
  
  ffmpeg -f concat -i input.txt -codec copy output.mp4

  Where the input.txt looks like :

  file 'E:\video1.mp4'
  
  file 'E:\splitter.mp4'
  
  file 'E:\video2.mp4'

  The content of splitter.png is visible in the splitter.mp4, but not in the output.mp4. Also I’m not entirely sure the splitter.mp4 respects the exact same encoding as the 2 videos, and I don’t know how to verify that.

  Method 2 : insert image frames

  Directly run the concat (demuxer) 90 times (30fps -> 3 seconds) on the image

  ffmpeg -f concat -i input.txt -codec copy output.mp4

  Where the input.txt looks like :

  file 'E:\video1.mp4'
  
  file 'E:\splitter.png'
  
  ...
  
  file 'E:\splitter.png'
  
  file 'E:\video2.mp4'

  Edit : possible solution ?

  Since all I’m doing is screencasting, I might as well screencast my splitter image. This way I would be sure of the audio & video encoding and wouldn’t have any problem merging and it wouldn’t need any reencoding... I know it might sound dumb, but it would probably do the trick...

  Note : I didn’t have try it, since I already worked through Openshot.