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• Low Latency DASH Nginx RTMP

  3 août 2017, par Kenan Christian

  I use arut nginx-rtmp-module (https://github.com/arut/nginx-rtmp-module) on the media server, then I tried to stream using FFmpeg to the dash application, then I test the stream by playing it using VLC.

  And it waits around 30secs to start playing, and it plays from the beginning, not the current timestamp.

  This is my current config on the RTMP block

  rtmp {
  
      server {
  
          listen 1935;
  
  
  
          application live {
  
              live on;
  
  
  
             exec ffmpeg -re -i rtmp://localhost:1935/live/$name
  
                -c:a libfdk_aac -b:a 32k  -c:v libx264 -b:v 128K -f flv rtmp://localhost:1935/hls/$name_low
  
                -c:a libfdk_aac -b:a 64k  -c:v libx264 -b:v 256k -f flv rtmp://localhost:1935/hls/$name_mid
  
                -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 512K -f flv rtmp://localhost:1935/hls/$name_hi
  
                -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 512K -f flv rtmp://localhost:1935/dash/$name_dash;
  
          }
  
  
  
          application hls {
  
               live on;
  
  
  
               hls on;
  
               hls_path /tmp/hls;
  
               hls_nested on;
  
  
  
               hls_variant _low BANDWIDTH=160000;
  
               hls_variant _mid BANDWIDTH=320000;
  
               hls_variant _hi  BANDWIDTH=640000;
  
          }
  
  
  
          application dash {
  
              live on;
  
  
  
              dash on;
  
              dash_path /tmp/dash;
  
              dash_nested on;
  
          }
  
      }
  
  }

  This is the command I use for streaming

  ffmpeg -re -i 2014\ SPRING.mp4 -c copy -f flv 
  
  rtmp://52.221.221.163:1935/dash/spring

  How can I reduce the delay, and make it play from the same timestamp as the streamer ?

  Can I achieve under 5s latency ?

  UPDATE

  Tried to change the playlist length and fragment length, using this directive

  dash_playlist_length 10s;
  
  dash_fragment 2s;

  But still got some latency problem, sometimes it’s smaller than before, sometimes it’s the same

• How to convert an rtmp stream to HEVC DASH/HLS using nginx ?

  17 juillet 2019, par Hakan Murat Aksüt

  exec_push /usr/bin/ffmpeg -re -i rtmp://localhost:1935/$app/$name -ar 44100 -vcodec libx264 -g 25 -f flv rtmp://localhost/live/$name_hi

  I can broadcast h264 video on my nginxg server. but it doesn’t work when I want to make h265 instead of h264. I found out that this is because rtmp does not support h265. Is there a way to do this using rtmp if possible ?
  if not, what else can be used to stream h265 video in nginx instead of rtmp.

  rtmp {
  
      server {
  
              listen 1935;
  
              chunk_size 4096;
  
  
  
              application src {
  
                  live on;
  
                  exec_push /usr/bin/ffmpeg -re -i rtmp://localhost:1935/$app/$name -ar 44100 -vcodec libx264 -g 25 -f flv rtmp://localhost/live/$name_hi;
  
              }
  
  
  
              application live {
  
                      live on;
  
                      hls on;
  
                      hls_path /usr/share/nginx/hls; #file path for save
  
                      hls_fragment 1;
  
                      hls_playlist_length 10; 
  
                      hls_cleanup on;
  
                      dash on;
  
                      dash_path /usr/share/nginx/dash; #Sets MPEG-DASH playlist and fragment directory. If the directory does not exists it will be created.
  
                      dash_fragment 1; #Sets MPEG-DASH fragment length. Defaults to 5 seconds.
  
                      dash_playlist_length 10; #Sets MPEG-DASH playlist length. Defaults to 30 seconds.
  
  
  
                      dash_cleanup on; `
  
                     } 
  
  }

• FFMpeg : Adding subtitles to Dash MPD

  19 juillet 2022, par Solaris

  TL ;DR How to include subs while generating mpd with ffmpeg dash

  


  I am trying to convert mkv multi audio/subs files to dash mpd. Referring to the ffmpeg docs for dash Current progress is I have working mpd with multiple audio. But no clue on how to include subs/captions.

  


  ffmpeg -re -y -i input.mkv -map 0:0 -map 0:1 -map 0:2 -c:a aac -c:v libx264 \ -b:v:0 800k -b:v:1 300k -s:v:1 1280x720 \ -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \ -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \ -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=1 id=1,streams=2" \ -f dash out4/out.mpd


  


  What have I tried ?

  


  ffmpeg -re -y -i input-kaisen.mkv -map 0:0 -map 0:1 -map 0:2 \
-map 0:3 -c:s webvtt \
-c:a aac -c:v libx264 \
-b:v:0 800k -s:v:0 1280x720 \
-bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \
-b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
-window_size 5 -adaptation_sets "id=0,streams=0 id=1,streams=1 id=2,streams=2 id=3,streams=3" \
-f dash outNull/out.mpd


  


  Throws error Could not find tag for codec webvtt in stream #0, codec not currently supported in container

  


  Reference for Stream mapping :

  


    Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  Stream #0:2 -> #0:2 (opus (native) -> aac (native))
  Stream #0:3 -> #0:3 (ass (ssa) -> webvtt (native))


  


  Edit1 : Made some progress , ffmpeg is not recognizing webvtt cause its using mp4 container , thus changed the container to webm with -dash_segment_type webm and switched vcodec to vp9 , acodec to opus
But that aint a solution as I need to support x264 vcodec.
Multiple -dash_segment_type didnt help