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• Quickest way to convert HD videos to webm

  27 mars 2014, par Daniel7912

  I'm currently using the following command to convert .mp4 videos into .webm.

  ffmpeg -i input.mp4 -vpre libvpx-720p -b 3900k -an -f webm -y output.webm

  I appreciate that I'm converting in HD format, but the conversion takes a very long time. Is there anything I can do to speed it up ? I'm running it directly on my web server and trying to tie it in with Node.js as part as a content management system

  Thanks for any help

• What resolution would be best for processing videos in firebase functions ? [closed]

  11 janvier 2020, par Nathan

  I’m making an app that is mainly used for sharing videos of maximum 30 seconds long. One video example could be a screen recording of someone’s computer screen or a game. I have this code that checks whether the uploaded video that has just been uploaded to firebase storage has been processed or not and if it hasn’t then I use ffmpeg to process the video (change the resolution etc.) with this command :

  const promise = spawn('./ffmpeg', ['-i', tempFilePath, '-vf', 'scale=1280:720', targetTempFilePath]);

  Now with these commands, the firebase function is giving me a timeout error when I upload 30 second clips since I’m only converting the video to 720. I was just wondering what compression settings would be sufficient enough for the video to :

  1. Be still a high enough quality in my app
  2. Not take ages processing the video in the function (10-20 second clips works perfectly well).

  I know the better option would be to use Googles App engine or something similar to process videos but I’d prefer it to avoid that at the moment, if I can’t process videos to a good enough quality without sacrificing efficiency then I will go to something like Google’s App engine, just need some advice and some pointers for it otherwise.

  EDIT :

  I’ve seen instagram compresses their videos to a resolution of 640x640 ? Would that be reasonable or is it dependent on the original clip’s resolution ?

  Thanks

• [SOLVED]how do I apply watermark on multiple videos in the current directory with ffmpeg

  22 octobre 2017, par Ariane Martins Gomes Do Rego

  Linux + ffmpeg

  I have a folder with 300 videos. I need to apply the same watermark on all these videos, so in the folder I have 300 video files + 1 png file which is my watermark, how do I convert all with different names, so that the next file does not overwrite the previous one ?

  Answer :

  for f in *.mp4; do ffmpeg -i "$f" -i watermark.png -filter_complex 'overlay=10:10' -strict -2 "$f-marked.mp4"; done

  Thank you so Much. [SOLVED]