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• Extracting subtitles of a mkv file using ffmpeg while downloading

  19 août 2020, par Tim Untersberger

  I am trying to stream a mkv file to a webpage, which is being downloaded using WebTorrent. The video file has ASS/SSA embedded subtitles. I am using electron to display the video, which uses chromium without proprietary codec support, so I have to use the following html :

  


  <video controls="controls">&#xA;  <source src="video.mkv" type="video/webm">&#xA;<video></video>&#xA;</source></video>

  


  Since chrome supports webm and they use the same container, I can watch the video with audio. Webm doesn't support embedded subtitles, so the subtitles of the video get ignored.

  


  I am extracting the subtitles using the following command :

  


  ffmpeg -i video.mkv -map 0:2 sub.vtt


  


  This works fine, but requires the file to be downloaded completely. Is it possible to extract the subtitles while the file is being downloaded, so that I can begin streaming the video together with the subtitles as soon as possible ?

  


• run ffmpeg commands from my own project

  28 octobre 2013, par bruno

  I'm starting a project where I want ppl to upload videos of a talk and a the video of slides for that talk and want to merge them (to play at the same time) and then show results.

  My question is :
  Is it possible to do that from code ? if it is, can you point me to the right doc ?
  I was able to do it running command line, but as I want this to run on a server with different ppl uploading their videos I think this would not be the best approach.
  I have a preference for Java if it's possible to do it, but I can manage to use other languages what do you guys suggest ?

  The idea would be to have a service where I can point the urls of the videos stored in my server and it would merge them and save file where I can later stream. With different ppl uploading videos at the same time and being able to watch the result in a reasonable amount of time.

  I used this tutorial to test :
  https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

  Thanks for your time

• Alternatives to Facebook 360 Encoder for Spatial + Headlock Encoding ?

  31 juillet 2023, par Robert N

  Unfortunately FB 360 Encoder is no longer being worked on with no alternatives that I can find & right now I cannot get it to work on mac.

  


  I am looking to combine two stems as per the tutorial here - 1 spatial audio (16channel) with 1 headlock audio (stereo) for a 180 stereo (side by side) video in the highest quality allowed for a Meta Quest 2 headset.

  


  FFMPEG recipes are preferred but paid alternatives are welcome. So far the best I could find for encoding was "use the old software" but even if it worked, I do not trust out of date/dead software for production : Facebook 360 Encoder Error - FFmpeg libavdevice.57.dylib (not a mach-o file)