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• avcodec/mpeg12enc : Don't initialize unused parts of RLTable

  22 octobre 2022, par Andreas Rheinhardt

  avcodec/mpeg12enc : Don't initialize unused parts of RLTable
  ff_rl_init() initializes RLTable.(max_level|max_run|index_run) ;
  
  max_run is unused by the MPEG-1/2 encoders (as well as SpeedHQ).
  
  Furthermore, it initializes these things twice (for two passes),
  
  but the second half of this is never used.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg12enc.c

• avcodec/speedhqenc : Don't initialize unused parts of RLTable

  22 octobre 2022, par Andreas Rheinhardt

  avcodec/speedhqenc : Don't initialize unused parts of RLTable
  ff_rl_init() initializes RLTable.(max_level|max_run|index_run) ;
  
  max_run is unused by the SpeedHQ encoder (as well as MPEG-1/2).
  
  Furthermore, it initializes these things twice (for two passes),
  
  but the second half of this is never used.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/speedhqenc.c

• fluent ffmpeg => how to trim and concate parts of video into one output file without writing many output files. Make a most efficient solution

  30 avril 2024, par Shreyansh Gupta

  I'm currently working on a online video website and i need to make a quick preview of videos using random timestamps and duration of the video.

  


  Suppose the video is of 15 min then i want to cut out some parts like ->

  


  1. from 00:00:40 take out next 2s 
2. from 00:01:20 take out next 2s 
3. ... and so on until the new video becomes 15s


  


  How can i do this with fluent-ffmpeg in the nodejs project

  


  Can i get the most efficient way of doing this without writing many output files and then concating them separately and removing then later

  


  Only concating the trimmed videos in one output file and save when it is done.

  


  I also came through a solution that uses complex filters but i don't know how to use it

  


     ffmpeg("video.mp4")
  .complexFilter([
    ....// some filters here

  ])
  .on('end',  function () {
    console.log('files have been merged and saved.')
  })
  .on('error',function (err){
    console.log(err)
  }
  .saveToFile("output.mp4")```