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• FFMPEG UDP to DASH I am wondering if it could be written more efficiently ?

  18 mars 2019, par c7borg

  I have the below working but it is quite cpu intensive I’ve just moved to ffmpeg 3.4 and was wondering if it could be written more efficently ?

  The below takes a multicast stream from our local LAN avoids the choppy footage by using the scenecut then adjusts the audio with the async to keep it in time and uses the yadif to deinterlace to provide better quality. This command/script also trims the maximum number of segments otherwise with a live stream it would fill up the directory.

  If anyone has any improvements I’d much appreciate it

  I also add subtitles using -filter_complex "[0:v][0:s]overlay" but this conflicts with the -vf yadif option.

  ffmpeg -i \
  
  "udp://@239.192.4.5:1234?overrun_nonfatal=1&fifo_size=50000000" \
  
  -acodec aac -strict -2 -vcodec libx264 \
  
  -vf yadif \
  
  -af aresample=async=1 \
  
  -x264opts 'keyint=25:scenecut=-1' \
  
  -window_size 10 -extra_window_size 10 \
  
  -f dash /var/www/html/stream/out.mpd

  If it can’t be written more efficiently at least this may help others as it took me a long time to get this far. For reference I use shaka player in chromium for the client side

• FFMPEG DASH Issues

  5 octobre 2022, par user726720

  I have a couple of questions regarding ffmpeg.

  


  


  1. First is i can't seem to get the frame rate correctly.

     


     

     


     I'm expecting 25, i have tried both , both give me the same result.

     


     -r 25 and -filter:v fps=25


     


     Here is my complete command im using

     


     ffmpeg -re -i file.mxf -pix_fmt yuv420p -vsync 1 -map 0:v:0 -map 0:a:0 -c:a aac -c:v libx264 -use_template 1 -use_timeline 1 -init_seg_name  "init-stream$RepresentationID$-$Bandwidth$.mp4" -media_seg_name "chunk-stream$RepresentationID$-$Number%05d$.$ext$" -b:v 2000k -b:a 48k -ac 2 -profile:v main -level:v 3.0 -s 640x360  -filter:v fps=25 -vsync passthrough -increment_tc 1 -adaptation_sets "id=0,streams=v id=1,streams=a" -g 100 -keyint_min 100 -seg_duration 5 -frag_duration 5 -dash_segment_type auto -f dash stream.mpd


     


  


  2. My second question is related to the use of audio, with the above command im acheiving the below results, with the use of AAC

     


     

     


     But my target is to acheive the below, how do i go about this

     


     

     


     

     3. How do i change the muxing mode to dash

     


     


     

     


     Like the below

     


     

     


  


  


• avformat/{isom,mov,movenc} : add support for CMAF DASH roles

  15 juillet 2021, par Jan Ekström

  avformat/isom,mov,movenc : add support for CMAF DASH roles
  This information is coded in a standard MP4 KindBox and utilizes the
  
  scheme and values as per the DASH role scheme defined in MPEG-DASH.
  
  Other schemes are technically allowed, but where multiple schemes
  
  define the same concepts, the DASH scheme should be utilized.
  Such flagging is additionally utilized by the DASH-IF CMAF ingest
  
  specification, enabling an encoder to inform the following component
  
  of the roles of the incoming media streams.
  A test is added for this functionality in a similar manner to the
  
  matroska test.
  Signed-off-by : Jan Ekström <jan.ekstrom@24i.com>
  

  • [DH] libavformat/isom.c
  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c
  • [DH] libavformat/movenc.c
  • [DH] libavformat/version.h
  • [DH] tests/fate/mov.mak
  • [DH] tests/ref/fate/mov-mp4-disposition-mpegts-remux