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• Create muted video and black screen video with FFmpeg

  2 mars 2021, par user2685832

  I'm trying to use FFmpeg to generate the following from a local mp4 file :

  



  

  • A copy of the original video with no audio

  


  • A copy of the original video with audio but without visuals (a black screen instead). This file also needs to be in mp4 format.

  


  



  After reading through the documentation I am struggling to get the terminal commands right. To remove the audio I have tried this command without any success :

  



  ffmpeg -i file.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy


  



  Could anyone guide me towards how to accomplish this ?

  


• Directory conversion with ffmpeg, filename edit (Windows)

  17 avril 2021, par Aussie iTV

  Being new here, I don't have the reputation to comment directly on the post.

  


  I am trying to use ffmpeg to convert *.mkv files to *.mp4 files in a directory.

  


  The below question had the answer I was looking for, but only one answer related to Windows, but doesn't seem to adjust for the fact that the outputting file will be labelled

  


  `%name%.mkv.mp4`


  


  I've seen elsewhere for single file bat files that you can use

  


  `"!name~0,-4~".mp4`


  


  which removes the 4 characters, but this didn't work in the code provided.

  


  How do I edit the code to remove the .mkv file

  


  `for %i in (*.mp4) do ffmpeg -i "%i" "%~ni.mp3`


  


  Additionally, how is a bat file ran via powershell ? The original answer says shift+left click, this does nothing for me.

  


  Thanks for the help !

  


  Original question post : How do you convert an entire directory with ffmpeg ?

  


• How can I pass chapter data to multiple streams with tee muxer

  11 février 2021, par jonnywishbone

  I'm trying to transcode several videos from their original format into 4K and 1080p HD MKV and/or MP4 containers. The original contains chapter info, but no matter how many incarnations of ffmpeg flags/settings I've tried, the chapter data doesn't wind up in either output stream.

  


  Here's a redacted version of the command I'm using (PowerShell 7.1) :
...

  


     ffmpeg -i "XXXXXxxxx.mkv" `
   -loglevel repeat+warning -stats  -hide_banner -y -benchmark `
   -flags +global_header -filter_complex `
   "[0:v]split=2[s0][s1]; `
   [s0]null[v2160]; [s1]scale=1920:-1[v1080]" `
   -to 00:01:05 -map "[v2160]" -map "[v1080]"  -map 0:1 -map_metadata 0 -map_chapters 0 -movflags use_metadata_tags `
   -c:v libx265  -x265-params  `
   "log-level=error" -pix_fmt yuv420p10le   `
  -b:v:0 3100K -b:v:1 2200K -minrate 400K -bufsize 8M  `
   -c:a:0 aac  -ac:a:0 2   -ar:a:0 48000 -af:a:0 dynaudnorm  -b:a:0 192k -disposition:a:0 default+original `
   -metadata:s:a:0 language=eng -metadata:s:a:0 title="aac-stereo" -metadata:s:a:0 handler="aac-stereo" `
   -metadata comment=" "  -metadata title=""XXXXXxxxx"  `
   -f tee "[select=\'v:0,a\':f=matroska]`""XXXXXxxxx [2160p].mkv`"|[select=\'v:1,a\':f=matroska]`""XXXXXxxxx [1080p].mkv`""


  


  ...

  


  What's the secret sauce for getting chapter info passed to the output streams ? Is it a tee select of some sort ? A different -map_metadata -type setting ?

  


  Please forgive the odd code formatting - the editor really didn't know what to do with PowerShell back-tick escape characters that delimit quotes and other literals in PS scripting !