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• maintainers : adding myself as a maintainer to webm dash

  22 mai 2014, par Vignesh Venkatasubramanian

  maintainers : adding myself as a maintainer to webm dash
  adding myself as a maintainer to webm dash (part of matroskaenc.c)
  Signed-off-by : Vignesh Venkatasubramanian <vigneshv@google.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] MAINTAINERS

• FFmpeg dash manifest '-window_size'

  14 novembre 2018, par edwinbradford

  In the FFmpeg DASH documentation I don’t understand the purpose of -window_size which is explained as :

  Set the maximum number of segments kept in the manifest.

  If my video is 30 seconds long, the GOP size is 4 seconds and the segment length is 4 seconds, what is the meaning and purpose of a parameter to control the maximum number of segments kept in the manifest, when does this parameter need to be used and how do you determine valid values ?

  I’m guessing that the stream is being loaded into memory and the number of segments in the manifest controls how much is kept in memory at one time but it’s just a wild guess and I can’t find any further explanation.

  I am not live streaming in case it’s relevant.

• Convert m3u8 (HLS) to mpd (MPEG-DASH)

  24 mai, par Almog

  I have Live stream of HLS [https://82-80-192-30.vidnt.com/ipbc_IPBCchannel11LVMRepeat/definst/IPBCchannel11LVM_3.stream/playlist.m3u8] and I want to convert it to MPEG-DASH.

  



  What is the best practice ?

  



  The stream is already h264 aac therefore I understand I do not need to reencode and I just need to transmux.

  



  What should I use ?
ffmpeg ? mp4box ?

  



  Notes :

  



  


  1. I used nginx-rtmp-module (https://github.com/ut0mt8/nginx-rtmp-module/) in order to create DASH from RTMP stream according to this tutorial : https://isrv.pw/html5-live-streaming-with-mpeg-dash
But nginx-rtmp-module can get as input just rtmp streams and it did not work for me with HLS stream.

  


  2. I used ffmpeg in order to create dash from m3u8 as following :

     



     ffmpeg -i https://82-80-192-30.vidnt.com/ipbc_IPBCchannel11LVMRepeat/_definst_/IPBCchannel11LVM_3.stream/playlist.m3u8 -strict -2 -min_seg_duration 2000 -window_size 5 -extra_window_size 5 -use_template 1 -use_timeline 1 -f dash out.mpd

  


  



  But this is very limited. I can't control the segment duration.
The min_seg_duration parameter of ffmpeg does not work very well for me, and also it can set the minimum duration while I want to limit the maximum duration of each segment (the segment comes out with 10 seconds, while I need it to be 2-4 seconds as I'm playing live).