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• Revision 916aff66330ab03114ba37289f50458dcd55ecad : Ameliorer la modification de chemin : bouton "Deplacer" et non "Changer" ...

  24 septembre 2010, par Cerdic — Log

  Ameliorer la modification de chemin : bouton "Deplacer" et non "Changer" En float right pour ne pas faire croire qu’il est associe a l’objet, mais au chemin en general placeholder pour l’animation ajax git-svn-id : svn ://trac.rezo.net/spip/spip@16250 (...)

• Pipe ffmpeg output to named pipe

  9 novembre 2016, par user3657114

  I’m trying to get ffmpegs output to a named pipe, where I could read from another shell. I do not need the video stream piped, just the informations below to get a state of the conversion process back. I am not able to achieve the piping behavior in any way, but I can write the data to a file with the following command :

  ffmpeg -i vid.mov -vcodec h264 -acodec aac -strict -2 -y vid.mp4 > fflog.txt 2>&1

  This leads to the following output in fflog.txt

  Stream mapping:
  
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Stream #0:0 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=   50 fps=0.0 q=0.0 size=       0kB time=00:00:03.20 bitrate=   0.1kbits/s
  
  frame=   73 fps= 70 q=28.0 size=     230kB time=00:00:04.05 bitrate= 465.4kbits/s
  
  frame=  100 fps= 65 q=28.0 size=     462kB time=00:00:05.44 bitrate= 695.3kbits/s

  Afterwards I can get lines via

  tail -f -1 fflog.txt

  out of the file. But the lines are not escaped correctly, I think. Vi shows me the following :

  frame=   50 fps=0.0 q=0.0 size=       0kB time=00:00:03.20 bitrate=   0.1kbits/s
  
  ^Mframe=   73 fps= 70 q=28.0 size=     230kB time=00:00:04.05 bitrate= 465.4kbits/s
  
  ^Mframe=  100 fps= 65 q=28.0 size=     462kB time=00:00:05.44 bitrate= 695.3kbits/s
  
  ^Mframe=  125 fps= 61 q=28.0 size=     608kB time=00:00:06.48 bitrate= 767.5kbits/s

  So the questions are :

  1. How to convert the CRLF to UNIX like LF to return data correctly via tail -n ?
  2. Or even better : How to pipe the ffmpeg results correctly to a mkfifo named pipe ?
  3. Or the most general : Is there a different way to achieve my goal in a more clever manner ?

• Any equivalent to '-c:v copy' for changing container of webm to mp4 video client-side in JS ?

  15 mars 2020, par programmingisphun

  Exploring the Mediarecorder API and really hope to get an mp4 output instead of webm. Prefer to stay client-side to reduce server resources and ffmpeg.js at 17mb doesn’t seem viable for online use.

  Discovered that one can create (Chrome/Firefox) a webm/h.264, which converts without re-encoding to an mp4 using FFMPEG. The resulting file opens fine in Quicktime MacOS (snippet source) :
  ffmpeg -i _inputfile_.webm -c:v copy _outputfile_.mp4

  Whereas this clever hack works to display the video maybe as an mp4 in the browser, but the downloaded file won’t open in Quicktime (just VLC, same for webm) :

  new Blob(recordedBlobs, {type: 'video/mp4'});
  
  video.src = window.URL.createObjectURL(superBuffer);

  Therefore, wondering if there’s another JS hack to do what FFMPEG’s -c:v copy does, but to the blob bytes of the MediaRecorder’s recordedBlobs and give it the same mp4 container that’s accepted by Quicktime/etc ?

  Pastebin of current setup