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• 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 ?

• minimum delay for mpeg-dash stream using ffmpeg

  9 février 2017, par evan

  I am trying to stream my video files using MP4Box and ffmpeg and using mpeg-dash, I transcoded my video using this command for video :

  ffmpeg -i main720.MTS -movflags faststart -vcodec libx264 -r 24 -tune zerolatency -tune fastdecode -bf 0 -slices 0 -x264opts intra_refresh=1 -g 96 -b:v 700k -maxrate 700k -bufsize 400k -an -s 640*360 -ss 00:00:00 -t 00:02:00 main720_700_video.mp4

  and this for audio :

  ffmpeg -i main720.MTS -movflags faststart -acodec libmp3lame -b:a 128k -vn -ss 00:00:00 -t 00:02:00 main720_700_audio.mp4

  and this to make the mpeg-dash file :

  MP4Box -dash 4000 -frag 4000 -profile onDamand -rap -segment-name %s_ -out manifest.mpd main720_300_video.mp4 main720_700_video.mp4 main720_300_audio.mp4

  but I am NOT getting a fast stream and it has got some delay, any suggestions on how to make this delay lower ??

• I-Frames replacement in MPEG DASH

  7 mars 2019, par Hangil Kang

  We are conducting a research which requires to change only I-Frames in the middle of MPEG DASH service.

  Based on my knowledge, each segment of a full video contains one I frame and related B and P frames. For our research, we want to do something with only I frames and re-encode the frames into the corresponding segment and during the decoding process, we want to do something with the I frames again.

  Any ideas how to do this ?

  I appreciate all comments.