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• How should I configure FFmpeg to restrict the size and duration of dash chunks ?

  30 juillet 2022, par CodingIsMagic

  There is a .mp4 file of 35 MB and 51 seconds. I want to create 51 dash chunks, each corresponding to 1 second with a size of less than 1MB (the total size should be almost the same as the original file). Please note that I want to implement lossless converting.

  


  ffmpeg -re -i Animated-Background_Bidirection.mp4 -map 0:0 -c:v libx264 -crf 1 -profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 -use_timeline 1 -use_template 1 -seg_duration 1 -window_size 60 -adaptation_sets "id=0,streams=v id=1,streams=a" -f dash ./dashTest/out.mpd


  


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• 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 ?

  


  


• 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.