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• ffmpeg : simple RTMP streaming

  2 avril 2013, par sajad

  I am trying to launch up a rtmp transcoder server using ffmpeg ; that receives udp MPEG-TS streams as input, transcodes it ; and generates an rtmp output to a URL, that can be accessed by users to receive and play the rtmp stream. All these are expected to be performed in a LAN and the output be accessed by all users.

  1) First I don't know where the URL should point to. Is it enought to specify the IP of the system and some optional port ? Is it neccessary that a program should be listening on that port ?

  2) How I can play the stream on the URL ?

  I use a linux ubuntu machine whith IP=10.1.1.229 and I want to transcode multicast stream on this URL : udp://@224.10.1.1:2001.

  here is the command used to transcode input stream and generate rtmp url "rtmp ://10.1.1.229:2020".

  ffmpeg -y -f mpegts -i "udp://@224.10.1.1:2001" -re -vcodec libx264 -maxrate 700k -r 25 -s 640x360 -deinterlace -acodec libfaac -ab 64k -ac 1 -ar 44100 -f flv "rtmp://10.1.1.229:2020"

  and here is the command by which I am trying to play rtmp stream :

  ffplay rtmp://10.1.1.229:2020

  Any guidance would be helpfull. Thank you.

• ffmpeg output 0 second with wrong coordinates and hidden text

  18 juillet 2023, par Abdullah Mohamed

  I'm trying to add some Text and Images to the video

  


  Code

  


  -i 'input.MOV' -i 'image.jpg'         -filter_complex "[0]crop=1181.25:2100.0:1089.375:0.0[v];
          color=black[c];
          [v]colorchannelmixer=0.39:0.769:0.189:0:0:0.349:0.686:0.168:0:0:0.272:0.534:0.131:0:0:0:0:0[v];
          [c][v]scale2ref[t][v];
          [t]setsar=1,
          colorkey=black,
          split=2[t1][t2];
                  [t1]drawtext=
          text=Abdullah Muhammad T1
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#2196f3
          :fontcolor=#f44336,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=400.0:y=300.0:shortest=1[v],
          
          
                  [t2]drawtext=
          text=Abdullah Muhammad T2
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#ffeb3b
          :fontcolor=#000000,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=-90.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=30.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=200.0:y=600.0:shortest=1
          
          
          " -c:a copy -preset ultrafast -y 'output.mp4'


  


  My Issues

  


  

  1. First image should be at 0,0 coordinates but it's not.

  


  2. There should be 2 Texts but 1 of them is hidden and the other is not fully shown.

  


  3. the video is 13 seconds and the output is only 0 second.

  


  


  Expected

  


  


  Texts should be shown and images should be in the right position and video output should be 13 seconds.

  


  


  Actual


  


  Another issue

  


  


  If I trimmed the video the output will still be the same duration

  


  


  -i 'input_video.MOV' -ss 0:00:00.000000 -t 0:00:16.216000 -i 'input_image.jpg'         -filter_complex "[0]crop=1181.25:2100.0:1089.375:0.0[v];
          color=black[c];
          [v]colorchannelmixer=0.39:0.769:0.189:0:0:0.349:0.686:0.168:0:0:0.272:0.534:0.131:0:0:0:0:0[v];
          [c][v]scale2ref[t][v];
          [t]setsar=1,
          colorkey=black,
          split=2[t1][t2];
                  [t1]drawtext=
          text=Abdullah Muhammad T1
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#2196f3
          :fontcolor=#f44336,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=400.0:y=300.0:shortest=1[v],
          
          
                  [t2]drawtext=
          text=Abdullah Muhammad T2
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#ffeb3b
          :fontcolor=#000000,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=-90.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=30.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=200.0:y=600.0:shortest=1
          
          
          " -c:a copy -preset ultrafast -y 'output.mp4'


  


• avcodec/x86 : add avx512icl function for v210dec

  14 décembre 2022, par James Darnley

  avcodec/x86 : add avx512icl function for v210dec
  Ice Lake (Xeon Silver 4316) : 2.01x faster (1147±36.8 vs. 571±38.2 decicycles) compared with avx2
  

  • [DH] libavcodec/x86/v210-init.c
  • [DH] libavcodec/x86/v210.asm
  • [DH] tests/checkasm/v210dec.c