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• Bash, ffmpeg and pipe musings

  4 septembre 2016, par nick

  I am trying to run Monit with this script. This script is running perfectly under root from command line however, when I try to run it from shell environment, it does not work after pipe sign, i.e. when I debug I can see it runs till pipe sign and ffmpeg command after pipe sign is not running neither from root nor any other user. Your help would be appreciated.

  #!/bin/sh
  
  pid_file="/home/tester/radio1.pid"
  
  name="radio1"
  
  
  
  case "$1" in
  
   start)
  
  
  
      echo "Start radio";
  
      rtl_fm -f 93.2970M -M wbfm | /opt/ffmpeg_qsv/ffmpeg/ffmpeg -f s16le -ac 1 -i pipe:0  -acodec libmp3lame -ab 128k -f flv rtmp://localhost:1935/live/test" &
  
          ch_pid=$!
  
      echo $ch_pid
  
      echo $ch_pid > $pid_file
  
      echo `( >>/dev/null )&`;
  
           ;;
  
  
  
   stop)
  
      echo "Stop radio";
  
      PID=`cat $pid_file 2>/dev/null`
  
      kill $PID >/dev/null 2>&1
  
          rm -f $pid_file
  
           ;;
  
          *)
  
      echo "Usage: /etc/init.d/$name {start|stop}"
  
           exit 1
  
           ;;
  
   esac
  
  
  
  
  
  exit 0

• Error writing trailer of feed1.ffm Broken pipe

  28 août 2016, par Bullgod

  i’m using ffserver to streaming videos but i have a problem when i create the playlist to stream.
  The problem is :

  av_interleaved_write_frame(): Broken pipe
  
  Error writing trailer of http://localhost:8090/feed1.ffm: Broken pipe

  The Command with the problem is :

  # ffmpeg -i 16portrait.mp4 http://localhost:8090/feed1.ffm
  ffmpeg version git-2016-08-27-dc7e5ad Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
  configuration : —prefix=/root/ffmpeg_build —extra-cflags=-I/root/ffmpeg_build/include —extra-ldflags=-L/root/ffmpeg_build/lib —bindir=/root/bin —extra-libs=-ldl —enable-gpl —enable-nonfree —enable-libfdk_aac —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libfreetype —enable-libspeex —enable-libtheora
  libavutil 55. 29.100 / 55. 29.100
  libavcodec 57. 54.100 / 57. 54.100
  libavformat 57. 48.100 / 57. 48.100
  libavdevice 57. 0.102 / 57. 0.102
  libavfilter 6. 57.100 / 6. 57.100
  libswscale 4. 1.100 / 4. 1.100
  libswresample 2. 1.100 / 2. 1.100
  libpostproc 54. 0.100 / 54. 0.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’16portrait.mp4’ :
  Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : isomiso2avc1mp41
  date : 2013-11-29T13:19:09+0100
  encoder : Lavf57.41.100
  location-fra : +48.8789+002.3376+48.927994/
  location : +48.8789+002.3376+48.927994/
  Duration : 00:00:02.12, start : -0.025057, bitrate : 1226 kb/s
  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p, 320x568, 978 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  (default)
  Metadata :
  handler_name : VideoHandler
  Stream #0:1(und) : Audio : mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 256 kb/s (default)
  Metadata :
  handler_name : SoundHandler
  [tcp @ 0x3f08e20] Connection to tcp ://localhost:8090 failed (Connection refused), trying next address
  [tcp @ 0x3f29ee0] Connection to tcp ://localhost:8090 failed (Connection refused), trying next address
  [libvpx @ 0x3f15cc0] v1.6.0
  [ffm @ 0x3f8c640] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  Last message repeated 1 times
  Output #0, ffm, to ’http://localhost:8090/feed1.ffm’ :
  Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : isomiso2avc1mp41
  date : 2013-11-29T13:19:09+0100
  creation_time : now
  location-fra : +48.8789+002.3376+48.927994/
  location : +48.8789+002.3376+48.927994/
  encoder : Lavf57.48.100
  Stream #0:0(und) : Audio : vorbis (libvorbis), 22050 Hz, mono, fltp, 64 kb/s (default)
  Metadata :
  handler_name : SoundHandler
  encoder : Lavc57.54.100 libvorbis
  Stream #0:1(und) : Video : vp8 (libvpx), yuv420p, 720x576, q=10-42, 400 kb/s, 29.97 fps, 1000k tbn, 25 tbc (default)
  Metadata :
  handler_name : VideoHandler
  encoder : Lavc57.54.100 libvpx
  Side data :
  cpb : bitrate max/min/avg : 0/0/0 buffer size : 800000 vbv_delay : -1
  Stream mapping :
  Stream #0:1 -> #0:0 (mp3 (native) -> vorbis (libvorbis))
  Stream #0:0 -> #0:1 (h264 (native) -> vp8 (libvpx))
  Press [q] to stop, [?] for help
  av_interleaved_write_frame() : Broken pipe
  Error writing trailer of http://localhost:8090/feed1.ffm : Broken pipeframe= 3 fps=0.0 q=0.0 Lsize= 60kB time=00:00:00.08
  bitrate=6143.9kbits/s dup=1 drop=0 speed=0.44x
  video:50kB audio:0kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead : 19.768417%
  Conversion failed !

• Pipe opencv frames to ffmpeg

  17 juillet 2016, par baci

  I am trying to pipe opencv frames to ffmpeg using rawvideo format, which should accept the input as BGRBGRBGR... encoding the frame before piping is not an option.

  cv::Mat frame;
  
  cv::VideoCapture cap("cap.avi");
  
  
  
  while(1)
  
  {
  
      cap >> frame;
  
      if(!frame.data) break;
  
  
  
      // some processing
  
  
  
      cv::Mat array = frame.reshape(0, 1); // to make continuous
  
      std::string output((char*) array.data, array.total() * array.elemSize());
  
      std::cout << output;
  
  }

  with command

  cap.exe | ffplay -f rawvideo -pixel_format bgr24 -video_size 1920x1080 -framerate 10 -i -

  gives this kind of distorted result

  I think problem is not related to ffmpeg/ffplay, but something is wrong with my frame to raw conversion

  how to convert mat with 3 channels to rawvideo bgr24 format ?