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• FFMPEG hangs when trying to receive rtp/udp stream

  22 décembre 2016, par NathanK

  I am trying to receive a udp stream encoded as h264. The exact command I am using is :

  ffmpeg -v 9 -loglevel 99 -re -i "udp://239.192.1.2:1234" outfile.h264

  The output I receive is :

  ffmpeg version 3.2.2-1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 6.2.1 (Debian 6.2.1-5) 20161124
  
  
  
  
  
  configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-libopencv --enable-frei0r --enable-libx264 --enable-chromaprint --enable-shared
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Splitting the commandline.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'.
  
  Reading option '-re' ... matched as option 're' (read input at native frame rate) with argument '1'.
  
  Reading option '-i' ... matched as input url with argument 'udp://@239.192.1.2:1234'.
  
  Reading option 'outffff.h264' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument 9.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url udp://@239.192.1.2:1234.
  
  Applying option re (read input at native frame rate) with argument 1.
  
  Successfully parsed a group of options.
  
  Opening an input file: udp://@239.192.1.2:1234.
  
  [udp @ 0x7f6638a36280] No default whitelist set
  
  [udp @ 0x7f6638a36280] end receive buffer size reported is 131072
  
  [AVIOContext @ 0x7f6638a56840] Statistics: 0 bytes read, 0 seeks

  The problem with this is, obviously, that the ffmpeg process isn’t detecting any incoming packets on that address which causes the process to hang.
  I am, however, able to receive the stream using vlc, so I know that the packets are arriving. Here is a link to a similar problem.

  I thought, perhaps, it was a problem with reverse path filtering (as is mentioned in the link), but rp_filter is not set in /etc/sysctl.conf. I’m not quite sure what to do from here, any help is appreciated.

  Edit : I removed the @, however this changes nothing.

  The vlc command that works is :

  vlc --miface eth1 rtp://@239.192.1.2:1234

• Advice with ffmpeg creating clips out of a video

  5 décembre 2016, par Janx from Venezuela

  First of all I’m pretty new at this of video transcoding. I’m trying to use ffmpeg to create a 10 second clip out of a much larger video source, all this in a Node.js application using fluent-ffmpeg. My code goes something like :

  var command = ffmpeg().input(<sourcepath>).native().seekInput(<desiredstartpoint>)
  
      .duration(10)
  
      .on('start', function(commandLine){ // do some database persistence 
  
      }).on('progress',function(e){ // refresh a kill timeout
  
      }).on('error',function(e){ // clean up the mess
  
      }).on('end',function(e){ // success 
  
      }).save(<clipdestinationpath>);
  
  </clipdestinationpath></desiredstartpoint></sourcepath>

  Which usually translates into something like :

    ffmpeg -re -ss <desiredstartpoint> -i <sourcepath> -y -t 10 <clipdestinationpath>
  
  </clipdestinationpath></sourcepath></desiredstartpoint>

  What’s happening is that sometimes the process seems to ’hang’ and I have to manually kill the ffmpeg process (a batch console that appears on windows) for the node process to continue and the ’error’ callback to trigger. Same happens if I run the ffmpeg command manually on a CMD. It usually starts to :

     frame= xxx fps= yy q=x.x size= xxxKb time=00:00:0x.xx bitrate=xx.xxkbits/s
  
     frame= xxx fps= yy q=x.x size= xxxKb time=00:00:0x.xx bitrate=xx.xxkbits/s
  
     frame= xxx fps= yy q=x.x size= xxxKb time=00:00:0x.xx bitrate=xx.xxkbits/s

  Until is suddenly does it no more, and its hanged.

  I do have some fail-overs :

  • On the progress callback, I keep track of a timeout kill action, for when it hangs up, if there’s more than N seconds without activity, I call the kill like

    command.kill();

  • The other thing that I do is to decrement the desiredStartPoint by one (1) second at the time for up to five (5) seconds (greater than zero of course), and try again. Eventually the clip generates right, but it is so random... Sometimes it works like a charm, on the very first (1st) try it creates the clip all is OK to go.

  So my question is :

  • Do you see anything here that I might be missing ? Do I have to consider other variables ? like keyframes, fps, advanced stuffs like that ?

  I’ve also noticed that this happens more frequently on video sources recorded at high bitrate frequencies... I really don’t know men.

• Convert video in background

  27 novembre 2016, par RoiEX

  I found this question which is the same question I have, but with the small but important difference, that I’m using Windows so cronjobs are no thing.
  I basically want to convert a video in PHP, but don’t want the PHP script to hang up until the conversion is finished and instead return immediately.

  My current code :

  if ($videoext !== "mp4") {
  
      exec ( "./ffmpeg.exe -i " . $inputFile. " " . $outputFile/*without extension*/ . ".mp4" );//convert to useable format
  
      if (! in_array ( $videoext, $GLOBALS ['fileextensions'] )) {//Unsupported extension
  
          unlink ( $inputFile);//delete if not useful
  
      }
  
  }

  I’m using PHP7 with XAMPP for windows
  Any help is appreciated

  EDIT : I know that pthreads exist, but I’m not sure if they do what I’d expect them to do and too stupid to get them working on my XAMPP installation