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• Force FFMPEG to use TCP protocol when reading a RTSP Stream

  7 juin 2016, par gary_star

  I’m running ffmpeg (Windows 7, 64bit) from command line to get a frame from a RTSP stream (second channel from my DVR) :

  ffmpeg  -i "rtsp://xxx.xxx.xxx.xxx:554/user=xxxx&password=xxxx&channel=2&stream=0.sdp" -rtsp_transport tcp -y video.jpg

  After running, it waits for about 10 seconds and then i get :

  [rtsp @ 026fd840] UDP timeout, retrying with TCP

  After another long wait (2 minutes or so), i get :

  [rtsp @ 028dd840] Could not find codec parameters for stream 0 (Video: h264): unspecified size

  I read somewhere that I have to force using TCP, because changing from UDP to TCP will not work.

  I don’t understand why -rtsp_transport tcp is not working.

  I’m using ffmpeg version N-62509-g97751e1 built on Apr 17 2014 22:01:31 with gcc 4.8.2 (GCC).

  Please help me.
  Thank you.

• Retranslating video stream using ffmpeg

  6 mai 2014, par zdimon77

  I want to redirect video stream from rtmp to hls format using nginx rtmp-module.

  This my nginx config

      server {
  
      exec_options on;
  
      listen 1936;
  
      chunk_size 4000;
  
  
  
  
  
      application myapp {
  
       live on;
  
       exec /usr/bin/avconv -loglevel verbose -re -i rtmp://localhost:1936/myapp/$name -vcodec libx264 -vprofile baseline -acodec libmp3lame -ar 44100 -ac 1 -f flv rtmp://localhost:1935/hls/$name;
  
  
  
  
  
  }
  
  
  
  
  
  }
  
  
  
  server {
  
  
  
     listen 1935;
  
      chunk_size 4000;
  
  
  
      application hls {
  
          live on;
  
          hls on;
  
          hls_path /tmp/hls;
  
      }
  
  
  
  
  
  
  
  }

  But it doesnt work.
  When I try to publish my stream in console (without exec command in nginx.conf)

  ffmpeg -loglevel debug -re -i rtmp://localhost:1936/myapp/test -vcodec libx264 -vprofile baseline -acodec libmp3lame -ar 44100 -ac 1 -f flv rtmp://localhost:1935/hls/test

  I see this in console

  root@dcv23 :/usr/share/nginx/html# avconv -i rtmp ://localhost:1935/myapp/testname -vcodec copy -an -f flv rtmp ://localhost:1936/hls/testname

  avconv version 0.8.10-6:0.8.10-1, Copyright (c) 2000-2013 the Libav developers

  built on Feb 5 2014 17:15:30 with gcc 4.7.2

  [flv @ 0x98a3800] invalid stream

  [flv @ 0x98a3800] Estimating duration from bitrate, this may be inaccurate

  Input #0, flv, from ’rtmp ://localhost:1935/myapp/testname’ :

  Duration : N/A, start : 448.536000, bitrate : N/A

  Stream #0.0: Audio: nellymoser, 8000 Hz, mono, s16
  
  
  
  Stream #0.1: Video: flv, yuv420p, 800x600, 1k tbr, 1k tbn

  Output #0, flv, to ’rtmp ://localhost:1936/hls/testname’ :

  Metadata :

  encoder         : Lavf53.21.1
  
  
  
  Stream #0.0: Video: flv, yuv420p, 800x600, q=2-31, 1k tbn, 1k tbc

  Stream mapping :

  Stream #0:1 -> #0:0 (copy)

  Press ctrl-c to stop encoding

  ^Cframe= 200 fps= 7 q=-1.0 Lsize= 1031kB time=35.44 bitrate= 238.2kbits/s

  And process going but m3u8 files dont create.
  Can someone help me please ?
  Thank you.

• FFMPEG 2 Channel AIF files = fail

  23 avril 2014, par ImaginedDesign

  I wonder if anyone has a solution for AIF files that are "2 Channels", which do not compile in ffmpeg. But if you take the same aif file and open it up in a editor and recompile it as Stereo (L R), it works as expected.

  My ffmpeg command and console output :

  $ ffmpeg -i input.aif -ar 44100 -ab 128k -acodec libmp3lame -ac 2 -y output.mp3
  
  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Mar  2 2014 19:58:58 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-gpl --enable-version3 --enable-shared --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
  
    libavutil      52. 38.100 / 52. 38.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.100 / 55. 12.100
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 79.101 /  3. 79.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [aiff @ 0x1d94940] ID3v2.32 tag skipped, cannot handle version
  
  input.aif: Input/output error