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• Why the Target Duration of the created segments are not the one i specified

  12 mars 2013, par Anand

  I am using the following command

  ffmpeg -i Apple.ts -map 0:0 -map 0:1 -c copy -f segment -segment_time 10 -segment_list test.m3u8 -segment_format ts 'fileSequence%d.ts'

  The files do get segmented but the values are not precise. see in the .m3u8 generated below the target duration is 12 but i specified 10

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOWCACHE:1
  
  #EXTINF:11.478100,
  
  fileSequence0.ts
  
  #EXTINF:10.410400,
  
  fileSequence1.ts
  
  #EXTINF:11.745067,
  
  fileSequence2.ts
  
  #EXTINF:7.841167,
  
  fileSequence3.ts
  
  #EXTINF:8.024678,
  
  fileSequence4.ts
  
  #EXT-X-TARGETDURATION:12
  
  #EXT-X-ENDLIST

  Also if i dont want the floting point duration how do i do it ?

• Supporting HEVC/H.265 videos in Electron

  1er mars 2021, par Elmo

  Chrome/Electron don't normally support H.265 videos. I want the user to be able to play .mov files recorded by Apple devices in my app. How can I do this ?

  


  Possible approaches :

  


  

  1. Use ffmpeg to transcode to H.264 in real-time, which will be resource intensive (not ideal)

  


  2. Use WebAssembly to render the video in a <canvas></canvas> tag (not ideal)

  


  3. Fork and manually add H.265 codec support to Chrome/Electron (overkill)

  


  4. Use a native module that renders the video in a <canvas></canvas> or BrowserView

  


  


• FFMPEG : How to mix different types of image sequence inputs when creating multiple streams

  9 août 2021, par chutlies

  I am using a piece of software that generates a .txt files with rendered images. The list within that txt files is printed with the word 'file' at the beginning of the file path.

  


  Ex : file 'file:C :/Users/User/Desktop/test/Test.0001.png'

  


  I am attempting to input another image sequence as an overlay. Everything works fine if I just overlay, scale, and render. So this works fine :

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i C:/test/input.txt -i "C:/test/BALL.%04d.png" -filter_complex "overlay[4K_in];[4K_in]scale=1920:1080[hdOut]" -map [hdOut] hd.mp4


  


  But when I start to split the stream to create different outputs it will only render the overlayed stream [1:v] and not the composited image.

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i C:/test/input.txt -i "C:/test/BALL.%04d.png" -filter_complex "overlay,split=3[mp4HD_in][mxf720_in][mov4K_in];[mp4HD_in]scale=1920:1080[mp4HD_out];[mxf720_in]scale=1280:720[mxf720_out];[mov4K_in]scale=3840:2160[mov4K_out]" -crf 16 -vcodec libx264 -map [mp4HD_out] C:/test/hdMP4.mp4 -vcodec prores -map [mov4K_out] C:/test/MOV4K.mov -vcodec dnxhd -pix_fmt yuv422p -b:v 75M -map [mxf720_out] C:test/MXF720.mxf


  


  If I remove 'file' from the frames file path in the .txt file it works.

  


  Ex : file 'C :/Users/User/Desktop/test/Test.0001.png'

  


  Unfortunately, I am unable to change this as it's being generated and run within a piece of software. Are there any flags or something that I need to add to get around this ? Any other possible techniques beyond starting another &&ffmpeg call to generate the streams over the overlay ?

  


  I do get this in the logs :&#xA;[concat @ 0000024a0eacf280] DTS -230584300921369 < 0 out of order&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;[image2 @ 0000024a0eadd140] Thread message queue blocking ; consider raising the thread_queue_size option (current value : 8)

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