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• Why doesn't this live audio streaming from ffmpeg to ffserver work ?

  21 décembre 2015, par awidgery

  I have a USB mic plugged in, and it works :

  ffmpeg -f alsa -i plughw:1,0 -acodec libmp3lame -t 15 out.mp3

  out.mp3 contains audio from the mic.

  I have an ffserver config :

  Port 8090
  
  <stream>
  
  Format status
  
  </stream>
  
  
  
  <feed>
  
  </feed>
  
  
  
  <stream>
  
  Feed feed1.ffm
  
  Format mp3
  
  AudioCodec libmp3lame
  
  AudioBitRate 128
  
  AudioChannels 1
  
  AudioSampleRate 44100
  
  NoVideo
  
  </stream>

  If I start ffserver and then run :

  ffmpeg -i out.mp3 http://localhost:8090/feed1.ffm

  I can then access http://mydevice.local:8090/test.mp3 and I can hear out.mp3 being streamed.

  However, I want live audio streaming from the mic. So, I instead run :

  ffmpeg -f alsa -i plughw:1,0 http://localhost:8090/feed1.ffm

  In this instance I can connect to http://mydevice.local:8090/test.mp3 and it connects and plays, but I hear nothing (I’ve waited . When, however, I go back and kill (either Ctrl-C or pressing q) the ffmpeg command above, I hear a brief (<1s) bit of audio that is coming live from the microphone.

  Any ideas why ?

  ffmpeg info :

  ffmpeg version N-77183-g9553689 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration: --enable-libfreetype --enable-gpl --enable-nonfree --enable-libass --enable-libmp3lame --bindir=/usr/local/bin
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 19.100 / 57. 19.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 20.100 /  6. 20.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100

  ffserver info :

  ffserver version N-77183-g9553689 Copyright (c) 2000-2015 the FFmpeg developers

• ffmpeg rtmp streaming process exit

  12 août 2013, par Samson

  I'm using ffmpeg to capture jpeg images from an rtmp stream. Here is the command I use :

  /usr/local/bin/ffmpeg -threads 4 -i rtmp://..../chat/mp4:<variable>.mp4 
  
  -q:v 0.6 -r 15 -s 320x240 /frames/10021237_data/frame-%0999d.jpg
  
  
  
  ffmpeg version N-55388-g9386f33 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug  8 2013 14:07:38 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  
    configuration: 
  
    libavutil      52. 41.100 / 52. 41.100
  
    libavcodec     55. 24.100 / 55. 24.100
  
    libavformat    55. 13.102 / 55. 13.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
  Input #0, flv, from &#39;rtmp://......./mp4:10021237.mp4&#39;:
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1.92 tbr, 1k tbn, 40 tbc
  
      Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
  
  [swscaler @ 0x1910000] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to &#39;/frames/10021237_data/frame-%0999d.jpg&#39;:
  
    Metadata:
  
      encoder         : Lavf55.13.102
  
      Stream #0:0: Video: mjpeg, yuvj420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 90k tbn, 15 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> mjpeg)
  
  Press [q] to stop, [?] for help
  
  </variable>

  However after a few minutes I get this line (before the process exits) :

  video:5264kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000408%

  What exactly is the "muxing overhead" and why is it causing a crash ? Can I solve this or get it some other way (by restarting the process when it exits) ?

  EDIT :

  Actually it's not a crash. I'm running this command from a PHP CLI when a stream starts :

   $command = "/usr/local/bin/ffmpeg -i ".$rtmp." -q:v 0.6 -r 12 -s 320x240 ".__DIR__."/".$dir."/".$naming." >/dev/null 2>/dev/null &";
  
  shell_exec($command);

  but when one stops streaming all the ffmpeg processes end. Is there a way to make them independent ?

  Even opening 2 terminals and running the command (with different rtmp s)in each (for different streams), killing one of them closes the other one also.

  Bottom line is : How can I make 2 ffmpeg instances independent so as killing one does not kill the other. Is this behaviour expected ?

• run ffmpeg from PHP web script

  18 février 2014, par it6

  I need to manage the recording/capture of a website mindwhile it is running a slide-show to get videos form these slides.

  My approach is :

  <?php 
  
  
  
  define('FFMPEG_LIBRARY', '/usr/bin/ffmpeg ');
  
  
  
  $ffmpegcmd = "ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/output.mpg";
  
  
  
  shell_exec($ffmpegcmd);  
  
  
  
  ?>

  But i get this error from php error log :

  [x11grab @ 0x81e8aa0] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 800 height: 600
  
  No protocol specified
  
  No protocol specified
  
  [x11grab @ 0x81e8aa0] Could not open X display.
  
  :0.0: Input/output error

  Similar command from console run good.

  Please, any help to get display and be able to control ffmpeg from browser php script ?

  Thanks in advance.

  ---

  thanks for your time.

  I got rid the X display error, but not I still haven't got the capture.

  Using xvfb I get an unknown file at /tmp written by www-data user :
   rw-r—r— 1 www-data www-data 11252 Sep 12 09:49 server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm

  Running startx I got also an unknown file at /tmp
   rw------- 1 www-data www-data 59 Sep 12 09:53 serverauth.oLcFlG7tXC

  any of both grow in size so it is not capturing anything. The content is some binary thing.
  What are those files about ?

  What I am trying is to write a script in which I can control the time ffmpeg is capturing the desktop to create a video from a jquery slide displayed on a website.

  My try from console is closer, but if I can do it by browser I will be able to know when to stop sending an AJAX request once the slide is finished.

  This is my try from console :

  #!/bin/bash
  
  
  
  # start the slide website: I will need to change it to control by querystring the language and course level
  
  firefox http://www.languagecourse.net/vocabulary-trainer.php &
  
  # start recording: I will need to adjust the frame to capture
  
  ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/output2.mpg &
  
  # since I can't control the time a course takes I pause an arbitrary time
  
  sleep 5
  
  # look for the capture PID and close it
  
  for i in $(ps aux | grep ffmpeg | sed "s/  */#/g" | cut -f2 -d#)
  
  do
  
    echo "proceso $i killed"
  
    kill -9 $i
  
  done

  I wonder once the website is opened I can continue doing the control from AJAX, but not know if I will be able to get the ffmpeg PID to stop the command.

  I will appreciate any kind of comments.

  Regards,
  ·_-