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• yt-dlp and ffmpeg CLI : dynamically naming output file using ${}

  14 juin 2022, par garson

  I'm trying to dynamically name the output created by running yt-dlp and piping to ffmpeg for further processing. Ideally I'd also like to preserve other metadata from the Youtube in the output mp4 file.

  


  What I have tried (working example)

  


  yt-dlp "https://www.youtube.com/watch?v=PtkqwslbLY8" -o - | /
ffmpeg -i - -vcodec libx264 -crf 23 -preset fast -profile:v /
baseline -level 3 -refs 6 -vf "scale=640:-1,pad=iw:480:0:(oh-ih)/2,/
format=yuv420p" -acodec copy ${%(title)s}out.mp4


  


  What the current result is

  


  However, this just creates a file called out.mp4, without anything of the earlier video title in the file name.

  


  What I want the result to be

  


  I want the result to be a file called something like Jupiter_101_National_Geographicout.mp4 (based on the title of the Youtube Video).

  


• php streaming video : can tmp file be accessed before move_uploaded_file ?

  5 août 2019, par Jintor

  My question is about accessing file while they are being uploaded to the server.

  Can I perform "live" video streaming but BEFORE move_uploaded_file ???

  because move_uploaded_file have to wait until the video is completely finished.

  <?php
  
  // Can I access tmp before move_uploaded_file ?
  
  move_uploaded_file('tmp_name','new_location');

  Is there a way to access the tmp file during upload and perform ffmpeg ?

  I was considering upload by chunk via xhr request... but it seems .mp4 from a mobile don’t necessarily apply a fast start...

  how live streaming services companies do it ?

  ---

  **** More clarifications :
  Live streaming. Example User X take his phone and want to go live, he hit a button "stream yourself" than the camera starts recording and while uploading, the server begins to save it to the server and other users like Y, Z, A, B begin to watch while X is still begin live

• how can i insert an empty subtitle

  22 avril 2020, par Ginso

  i have a bunch of mp4 files and i would like to convert them to mkv, so that the automatic selection auf audio and subtitle track of vlc works.
the thing is some of them have 4 subtitles (first german and english only for foreign languages and then german and english for all) and some of them only 2 (because in those episodes there are no foreign languages). Can i insert 2 empty subtitle tracks before them so that i can set my vlc to select the first or second subtitle when i watch them ?

  



  i convert the episodes with 4 subtitles like this :

  



  ffmpeg -i in.mp4 -map 0:0 -map 0:1 -map 0:2 -map 0:3 -map 0:4 -map 0:5 -map 0:6 out.mkv

  



  0:0 is of course the video

  



  0:1 and 0:2 are audio tracks

  



  the rest are the subtitles

  



  BTW : is there a language code for forced subtitles ? -metadata:s:s:1 language=?