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• MPEG-DASH not working. MPD validation fails

  16 novembre 2017, par Marko36

  I am trying to serve video using MPEG-DASH. No success. I have tried the following :

  Following the instructions on webproject.org, using FFMPEG, I have created several variants of the original video and the DASH MPD manifest, containing metadata. However, the manifest does not validate using http://dashif.org/conformance.html. This validator itself is quite useless, as it provides unusable info about the error. I have found in a post from 2014, that one of the errors generated by FFMPEG is capital letters in some metadata (not a critical one, but could have been fixed for years !). Other errors detected, but not described. No tangible info from any of these other validators either : http://www-itec.uni-klu.ac.at/dash/?page_id=605 (produces rubbish info), https://github.com/Eyevinn/dash-validator-js (throws an exception)

  Following instructions on mozilla.org, produces the same non-working result, as the instructions are nearly identical (including same resolution*bitrate sets), except that Mozilla omits the use of dash.js, which is deemed necessary by the rest of the internet.

  This guide on Bitmovin, utilizing x264 and MP4Box does not work either. Going by the instructions, I have to recode the original x264 video twice. The final version of videos are in some cases twice the size of their intermediate versions and 720p video is actually larger than its 1080p, higher bitrate counterpart. No need to go further. (Yet, this is the only way that actually produced segments..)

  I have spent 3 days on the above, read about all there is on the web from the other frustrated adopters, and ran out of options. I would really apreciate some pro tips ! Thanks !

• Does not work -hls_playlist in ffmpeg in the -dash section

  18 mars 2019, par jidckii

  I will use this assembly ffmpeg
  https://hub.docker.com/r/jrottenberg/ffmpeg/

  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 6.2.1 (Alpine 6.2.1) 20160822  

  I’m trying to do dash and hls at the same time.

  In the documentation from here http://ffmpeg.org/ffmpeg-all.html#dash-2

  the key is :

  -hls_playlist hls_playlist
  
  
  
  Generate HLS playlist files as well. The master playlist is generated
  
  with the filename master.m3u8. One media playlist file is generated for
  
  each stream with filenames media_0.m3u8, media_1.m3u8, etc.

  those. mpd and m3u8 must be created at the same time.

  Running :

  ffmpeg -re \
  
  -analyzeduration 20000000 \
  
  -i udp: //239.0.0.1: 1234? overrun_nonfatal = 1 \
  
  -map 0 \
  
  -c copy \
  
  -f dash \
  
  -min_seg_duration 5000000 \
  
  -window_size 10 \
  
  -extra_window_size 10 \
  
  -remove_at_exit 1 \
  
  -hls_playlist 1 \
  
  -use_timeline 1 \
  
  -use_template 1 \
  
  -vtag avc1 \
  
  -atag mp4a \
  
  cam01.mpd

  and get an error :

  Unrecognized option 'hls_playlist'.  
  
  Error splitting the argument list: Option not found`

  without the -hls_playlist
  everything works correctly ...

  What could be the problem ?

• Changing start number in segment name - ffmpeg mpeg dash encoder

  4 mars 2019, par Trycoder

  I’m trying to implement MPEG dash live streaming using FFmpeg dash encoder and shaka player.

  Is there any way to set the start number to any value other than 1 ?

  For example, chunk-stream0-00009.m4s instead of the default starting segment chunk-stream0-00001.m4s