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• Convert video.ts file into video.mp4 using ffmpeg

  11 juillet 2020, par HorizonBloom

  So I tried to convert a file named video.ts into video.mp4 in Python and am getting the error :

  


  FileNotFoundError: [WinError 2] The system cannot find the file specified

  


  Assuming video.ts is already loaded into the program and subprocess already imported.

  


  This is due to the line :

  


  >>> subprocess.run(['ffmpeg', '-i', 'video.ts', 'video.mp4']) but I don't know what's the problem.

  


  I've opened the video.ts file and it seem to be working fine. Python version (3.8.2)

  


• How to know the delay of frames between 2 videos, to sync an audio from video 1 to video 2 ?

  8 janvier 2021, par jaimepm

  world.

  


  I have many videos that I want to compare one-to-one to check if they are the same, and get from there the delay of frames, let's say. What I do now is opening both video files with virtualdub and checking manually at the beginning of video 1 that a given frame is at position, i.e., 4325. Then I check video 2 to see the position of the same frame, i.e., 5500. That would make a delay of +1175 frames. Then I check at the end of the video 1 another given frame, position let's say 183038. I check too the video 2 (imagine the position is 184213) and I calculate the difference, again +1175 : eureka, same video !
The frame I chose to compare aren't exactly random, it must be one that I know it is exactly one I can compare to (for example, a scene change, an explosion that appears from one frame to another, a dark frame after a lighten one...) and I always try to check for the first comparison frames within the first 10000 positions and for the second check I take at the end.
What I do next is to convert the audio from video 1 to video 2 calculating the number of ms needed, but I don't need help with that. I'd love to automatize the comparison so I just have to select video 1 and video 2, nothing else, that way I could forget forever virtualdub and save a lot of time.

  


  I'm tagging this post as powershell too because I'm making a script where at the moment I have to introduce the delay between frames (after comparing manually) myself. It would be perfect that I could add this at the beginning of the script.

  


  Thanks !

  


• Load only the next 10min of HTML video when it is playing - not the entire video

  13 avril 2016, par W3Ape

  I have videos on my website with duration of almost 2h (=> large file size).

  I have managed to convert them to h265 to reduce server load. To further reduce server load I also want the video to only load e.g. the next 10min from the point the user currently is at in the video (and not the entire video). Youtube is doing it this way.

  The HTML preload attribute does not have this option. Is there such a feature in ffmpeg (or anywhere else) ?

  Thanks for a hint