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• Generate single MPEG-Dash segment with ffmpeg

  25 août 2021, par woubuc

  I've been trying to implement a Plex-like video player that transcodes an arbitrary video file on-demand, and plays it with MPEG-Dash on a webpage. I was able to implement the client side player with the dash.js reference implementation, so it will dynamically request segments from the server (using SegmentTemplate in the mpd file).

  



  But I'm having some problems generating these chunks in real-time. Ffmpeg lets me set -ss and -t to define the boundaries of the segment I need, but they don't play properly in the player because they're "full" video files rather than Dash segments.

  



  So how do I adjust my ffmpeg command to transcode just the part I need as a Dash segment, without having to generate the segments for the entire video file in advance ?

  



  The input video file can be any format, so it cannot be assumed it's in an mp4/dash-compatible codec. So transcoding (with ffmpeg or similar tool) is required.

  



  My current ffmpeg command looks like this (after lots of trying) :

  



  ffmpeg -ss 10 -t 5 -i video.mkv -f mp4 -c:a aac -c:v h264 -copyts -movflags empty_moov+frag_keyframe temp/segment.mp4


  



  The client-side player should be able to buffer the next X segments, and the user should be able to view the current position on the duration bar and seek to a different position. So treating it as a live stream isn't an option.

  


• Youtube DASH stream through to iOS format

  29 juillet 2014, par viperfx

  I have a stream link of a DASH codec format audio file using youtube-dl. It plays fine in the browser but on iOS the DASH codec is not supported. I am wondering how I can use ffmpeg to transcode the HTTPS stream live and then resend it out an AAC encoded m4a file or something that the iOS SDK supports through streaming - mp3 also works. I think using something such as nginx as the middleware inbetween would be a good idea. I can use python app to receive the request /videoID, it would grab the stream link and transcode it live feed it to nginx which would serve the correctly transcoded format back to the iOS app.

  Does anyone have any suggestions/ideas on how to achieve this ? I am stuck on the details on the ffmpeg bit.

• Add subtitles and storyboards to mpeg dash [closed]

  19 janvier, par ahamid555

  I need to stream a youtube video in my website and I need to do it not using the embed mode. I tried several steps and I failed to make it work completely. Please provide me any solutions for each step if you know.

  


  

  1. I tried to download the video in mpeg-dash format (with manifest and all chunk files) and I failed. Is it possible at first place ?

  


  2. I downloaded the video using ytdlp and I transcoded the movie to mpeg-dash format using ffmpeg, but I couldn't add subtitles and storyboards during the transcode, because the vvt subtitles are not compatible with mp4 containers.

  


  3. I decided to transcode the video first and then add the subtitles and storyboards using other tools (MP4Box) which I failed, too. Do you know any tool that does it as I want ?