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• Rotate mp4 videos without re-encoding

  3 novembre 2015, par stedes

  I’m looking for a way to rotate videos shot with my Nexus 4 on my Debian Wheezy sytem. The videos are shot in portrait mode and I would like to rotate them to landscape mode. Preferably the rotation is command-line driven.

  I have found several previous questions which are hinting at a good solution but I can’t seem to manage to get it working.

  To begin with there was this question :
  Rotating videos with FFmpeg

  But it indicates that ffmpeg is outdated and that I should use avconv. I found this question detailing the way to go forward.
  http://askubuntu.com/questions/269429/how-can-i-rotate-video-by-180-degrees-with-avconv

  This made me using following command :

  avconv -i original.mp4 -vf "transpose=1" -codec:v libx264 -preset slow -crf 25 -codec:a copy flipped.mp4

  However, this is painstakingly slow (last test took me more than 6 hours for less than 3 minutes of footage) and does not result in a playable movie. I also get an error in logging output which states Mb Rate > level limit.

  Is there an issue here with the re-encoding ? Should I first re-encode the videos from my phone to another, more "workable" encoding before applying the rotations ? Or am I missing another important point ?

  Thanks in advance

• Split videos to chunks using Rails and streamio-ffmpeg

  29 septembre 2021, par Nasser FN

  I've followed this tutorial both parts 1 & 2,https://www.randygirard.com/how-to-create-a-video-upload-platform-using-ruby-on-rails-part-2/

  


  so now I am able to upload videos, convert them to mp4 and display them to the user, but the problem is I want to split the uploaded videos to chunks of 30 seconds each and

  


  return them to the user so he/she can use them for whatsapp status.

  


  This' my main goal !

  


  As I've mentioned earlier, i followed the tutorial above, all I need is how to integrate

  


  and use https://github.com/streamio/streamio-ffmpeg in my rails code for splitting videos

  


  to chunks. Thanks !

  


• How to merge multiple videos end-to-end with yt-dlp or ffmpeg [closed]

  12 juillet 2024, par Pengu

  We want to download a bunch of small sections of videos then stitch them all together into one big video. How would we go about this ? Is there a way to bulk-stitch together videos from a particular folder ? We're planning to have thousands of clips, so the more automated it can be, the better.

  


  We are already using yt-dlp and ffmpeg for downloading the sections, so we would prefer if the solution was using those as well.

  


  The closest thing we could find was this https://github.com/yt-dlp/yt-dlp/issues/6595 which, when we try it, runs fine but the resulting clip is the same length as the parts used and doesn't seem to join them together.