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• Using ffmpeg to encode web dash and audio drift

  1er octobre 2016, par John Joske

  I’m trying to use ffmpeg to create webm-dash encoded files from a usb web cam. Adapted from this example http://wiki.webmproject.org/adaptive-streaming/instructions-to-do-webm-live-streaming-via-dash

  I have managed to get something nearly works with the following command :

  ffmpeg -f video4linux2 -framerate 30 -s 640x360 -i /dev/video0
  -thread_queue_size 512 -f alsa -ar 44100 -ac 2 -i hw:2 -map 0:0 -pix_fmt yuv420p -c:v libvpx-vp9 -s 640x360 -keyint_min 60 -g 60 -speed 6 -tile-columns 4 -frame-parallel
  1 -threads 8 -static-thresh 0 -max-intra-rate 300 -deadline realtime
  -lag-in-frames 0 -error-resilient 1 -f webm_chunk -header video_360.hdr" -chunk_start_index 1 video_360_%d.chk -map 1:0 -c:a libvorbis -b:a 128k -ar 44100
  -f webm_chunk -copytb 1 -audio_chunk_duration 2000 -header video_171.hdr -chunk_start_index 1 video_171_%d.chk

  However over a period of time the audio chunks slowly get behind the video chunks, can anyone suggest a way to ensure they stay the same.

• Dash JS Player Cross Browser Compatibility

  21 mai 2015, par JJ The Second

  I am conducting a research for my company streaming service. I found dash.js for adaptive streaming which is a perfect solution along with ffMpeg for transcoding.

  So how this solution works is to create bunch of files served in .mpd format. Now the questions I have :

  1. Do you think this a early stage and I should wait before start using DASH.JS ? Do you think there is a better solution for safe and fast streaming ?

  2. Player options : So far the only player I found was this http://dashif.org/reference/players/javascript/1.0.0/

     I have no idea how compatible it is with browsers and what limits I’ll be facing if I chose it. Is there any other solid solution for this ?

  3. Do you guys think I’m going wrong direction for this ?

  4. What are my server requirements to run these technologies ? I have a 500MBs, 64GB Ram, 24 Core, 2TB beast, does this do the job ?

• dashenc : Write out DASH manifest immediately in streaming mode

  8 juin 2021, par Kevin LaFlamme

  dashenc : Write out DASH manifest immediately in streaming mode
  When streaming mode is enabled with fMP4/CMAF for DASH output, the
  
  segment files are available to read by players as soon as the first byte
  
  is written instead of only after the file is fully written. The DASH
  
  manifest currently only gets written when the final write to the segment
  
  file occurs. This means that players cannot stream the first segment
  
  while it is being written.
  When -lhls is enabled with MP4 segments the HLS manifest is written
  
  immediately to advertise the in-flight segments. This change adds the
  
  same behavior for the DASH manifest so players can stream it
  
  immediately.
  

  • [DH] libavformat/dashenc.c