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• Working example on live streaming using FFMPEG+MP4Box+Dash.js

  27 février 2017, par BartMao

  I’m stucked on this issue for a couple of days, couldn’t find a perfect working example.

  Here’s my current method :

  Step 1.

  ffmpeg -re -i sample.mp4 -threads 0 -y \
  
  -map 0:1 -vn -acodec aac -strict -2 -ar 48000 -ac 2 \
  
  -f segment -segment_time 4 -segment_format mpegts Dash\audio_%d.ts \
  
  -map 0:0 -vcodec libx264 -vprofile baseline -preset veryfast \
  
  -s 640x360 -vb 512k -bufsize 1024k -maxrate 512k -level 31 -keyint_min 25 -g 25 \
  
  -sc_threshold 0 -an -bsf h264_mp4toannexb -flags -global_header \
  
  -f segment -segment_time 4 -segment_format mpegts Dash\video_%d.ts

  Step 2.

  mp4box -add Dash\audio_%d.ts Output\audio_%d.ts.mp4
  
  mp4box -add Dash\video_%d.ts Output\video_%d.ts.mp4

  Step 3.

  mp4box -dash-ctx Output\dash-live.txt -dash 4000 \
  
  -rap -ast-offset 12 -no-frags-default -bs-switching no \
  
  -min-buffer 4000 -url-template -time-shift 1800 \
  
  -segment-name live_$RepresentationID$_ -out Output\live \
  
  -dynamic -mpd-refresh 2 -subsegs-per-sidx -1 Output\audio_%d.ts.mp4:id=audio Output\video_%d.ts.mp4:id=video

  I played the live.mpd generated using Dash.js, the player paused a long time before actually playing, and freeze every time getting a new m4s file.

  Are there any wrong on my commands ? Or it would be great if can provide any other good examples.

• Converting a .flac or .mp3 file into an .mp4 to be DASH compatible

  13 juillet 2022, par TotomInc

  I would like to know if it's possible to convert a .flac or a .mp3 file into a .mp4 file (without image or video) in order to be DASH compatible.

  


  The goal is to make my audio files (.flac or .mp3) segmented and compatible with the DASH spec so I can stream audio segments with a web-server.

  


  I already tried to use GPAC MP4Box and ffmpeg but both doesn't seem to support really well audio-only.

  


  I would like some guidance if someone already has experience with this.

  


• Create one mpeg-dash segment

  19 février 2018, par Yuriy Pryyma

  I have video encoded in mpeg-dash(*.mpd, init segments, video segments)
  Task is to replace one of video segments with segment generated by me. And so video is still can be played.

  I read properties of one segment(combining init segment and video segment) using

  avformat_open_input
  
  avformat_find_stream_info

  1) I have tried to use dash muxer to generate new segment.

  avformat_alloc_output_context2(&avFormatContext, NULL, "dash", filename)

  But the problem is it creates mpd manifest, and other segments. So how to force it to create one segment ?

  2) When I parsed segment I noticed that it had format "QuickTime / MOV".

  avformat_alloc_output_context2(&avFormatContext, NULL, "mov", filename);

  So my another idea was to use "mov" encoder. And set properties same as in initial segment(start time, duration, resolution).
  But here the question is how to remove init header ? Because I already have init segment.

  Are there any other approaches to generate one mpeg-dash segment and how to solve my problems ?