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• Variable segment size while converting mp4 to HLS VOD

  31 janvier 2021, par dravit

  I am working on a project and am following https://gist.github.com/mrbar42/ae111731906f958b396f30906004b3fa to convert a mp4 file to a HLS m3u8 playlist. So far everything worked out. What I am trying to do now is an optimisation of the stream such that initial segment(s) can be of smaller size than the rest of them.

  


  What I have already tried is :

  


  

  1. hls_init_time, as per the documentation, this flag does the job. But when I say -hls_playlist_type vod, it forces hls_list_size to be 0 (again, as per the documentation). It made sense to me cause in a VOD, the playlist/manifest should have this info available always (cmiiw).

  


  2. played with ffmpeg and bash commands to get the playlist in the desired format, i.e. have segments with variable lengths. As a result, the video had an added pause after the variable segments (before the lengthier segments started to play).

  


  


  looks like a std problem
What I am stuck at is :

  


  

  1. Is this even possible to have segments in the m3u8 file with variable length ?

  


  2. Is there any other way I can achieve the above mentioned optimisation (changing playlist type/passing some other existing flag) ?

  


  


• Incorporating ffmpeg in a bash script

  12 septembre 2014, par Voprosnik

  I have a very large audio mp4 file that contains several songs.

  I have generated a script which reads a text file with the times and the song names and successfully assigns starttime, endtime and songtitle in 3 variables. The script successfully echoes the variables and returns the following format :

  00:00:00 00:10:15 Song1
  
  00:10:15 00:14:20 Song2

  and so on...

  Now I am intending to use this script with ffmpeg and crop each part of the big file into smaller audio files.

  The script thus, after feeding the variables in a while loop, it reaches to the command

  ffmpeg -ss $START -t $END -i ${1} -acodec copy $SONGNAME.mp4

  Once I run the script, the first two songs are cropped, but then the whole process stops with

  Press [q] to stop, [?] for help
  
  error parsing debug value
  
  debug=0

  I checked the generated files and they play ok, but there is no way for me to know why the script stopped there and did no proceed to the rest of the file (considering that when in the script I replace ffmpeg with echo, the script echoes the variables flawlessly).

  In other words I don’t know if there is a problem in my script, ffmpeg, or the source music file.

• Incorporating ffmpeg in a bash script

  22 novembre 2017, par Voprosnik

  I have a very large audio mp4 file that contains several songs.

  I have generated a script which reads a text file with the times and the song names and successfully assigns starttime, endtime and songtitle in 3 variables. The script successfully echoes the variables and returns the following format :

  00:00:00 00:10:15 Song1
  
  00:10:15 00:14:20 Song2

  and so on...

  Now I am intending to use this script with ffmpeg and crop each part of the big file into smaller audio files.

  The script thus, after feeding the variables in a while loop, it reaches to the command

  ffmpeg -ss $START -t $END -i ${1} -acodec copy $SONGNAME.mp4

  Once I run the script, the first two songs are cropped, but then the whole process stops with

  Press [q] to stop, [?] for help
  
  error parsing debug value
  
  debug=0

  I checked the generated files and they play ok, but there is no way for me to know why the script stopped there and did no proceed to the rest of the file (considering that when in the script I replace ffmpeg with echo, the script echoes the variables flawlessly).

  In other words I don’t know if there is a problem in my script, ffmpeg, or the source music file.