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• Low Latency DASH Nginx RTMP

  10 mai 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

• Create dash manifest-file for mp4-videos

  10 juillet 2020, par Werner

  I took a video and created 3 versions of it in different sizes (including a watermark, no audio here) with :

  


  ffmpeg -i "input.mov" -i "watermark.png" -an -c:v libx264 -x264opts "keyint=24:min-keyint=24:no-scenecut" -b:v 2400k -maxrate 2400k -bufsize 1200k -filter_complex "overlay=24:960,scale=640:480" -y "output_640_480.mp4"

ffmpeg -i "input.mov" -i "watermark.png" -an -c:v libx264 -x264opts "keyint=24:min-keyint=24:no-scenecut" -b:v 3200k -maxrate 3200k -bufsize 1600k -filter_complex "overlay=24:960,scale=800:600" -y "output_800_600.mp4"

ffmpeg -i "input.mov" -i "watermark.png" -an -c:v libx264 -x264opts "keyint=24:min-keyint=24:no-scenecut" -b:v 5300k -maxrate 5300k -bufsize 5300k -filter_complex "overlay=24:960,scale=1920:1080" -y "output_1920:1080.mp4"


  


  Now I want to create the manifest mpd file. The problem is that MB4Box is not available on the target-system, so I tried to do it with ffmpeg :

  


  ffmpeg
-f dash -i "output_640_480.mp4"
-f dash -i "output_800_600.mp4"
-f dash -i "output_1920_1080.mp4"
-c copy -map 0 -map 1 -map 2
-f dash -adaptation_sets "id=0,streams=0,1,2"
-y
"manifest.mpd"


  


  But I get errors :

  


  [dash @ 0000015ed965db40] Manifest too large: 6654253
output_640_480.mp4: Invalid data found when processing input


  


  The single videos do play without problems, but how do I create the manifest-file correctly ?

  


• lavf/dashdec : add 3GPP TS26.247 probe in dash demuxer

  19 février 2020, par Jun Zhao

  lavf/dashdec : add 3GPP TS26.247 probe in dash demuxer
  Enabled the 3GP-DASH Release-10/Relase-11(3GPP TS26.247) profile
  
  to dash demuxer probe.
  Signed-off-by : Jun Zhao <barryjzhao@tencent.com>
  

  • [DH] libavformat/dashdec.c