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• How can I use FFMpeg with PHP in a Vagrant environment ?

  31 juillet 2015, par curtisblackwell

  I’ve got this working on a DigitalOcean server, but I can’t seem to get it working locally.

  My Vagrant box is ubuntu/trusty64. When I ssh into the machine to check out the permissions of the ffmpeg binary, it’s 664. I tried running chmod 755 ffmpeg (w/ and w/o sudo), but it has no effect and outputs no response. I’m the owner, so chown wouldn’t make any difference (but also doesn’t work, w/ or w/o sudo). Outside of the Vagrant machine, the file permissions are 755 and owned by me, though that doesn’t seem to matter.

  The binaries are static builds from a site linked to on the official FFMpeg site’s download page.

  Running cat /etc/*-release on both the remote DO server and the Vagrant machine returns the same result :

  DISTRIB_ID=Ubuntu
  
  DISTRIB_RELEASE=14.04
  
  DISTRIB_CODENAME=trusty
  
  DISTRIB_DESCRIPTION="Ubuntu 14.04.2 LTS"
  
  NAME="Ubuntu"
  
  VERSION="14.04.2 LTS, Trusty Tahr"
  
  ID=ubuntu
  
  ID_LIKE=debian
  
  PRETTY_NAME="Ubuntu 14.04.2 LTS"
  
  VERSION_ID="14.04"
  
  HOME_URL="http://www.ubuntu.com/"
  
  SUPPORT_URL="http://help.ubuntu.com/"
  
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

  When attempting to execute the binary through PHP on the Vagrant machine (with exec()), I get a 126 exit code.

  What else should I try to get this working ?

• Capture desktop screens including audio with ffmpeg

  9 mars 2019, par klaus

  After referring to the official documentation and one other blog post, I now have following script :

  A="$(pacmd list-sources | grep -PB 1 "analog.*monitor>" | head -n 1 | perl -pe 's/.* //g')"
  
  F="/home/enan/Videos/$(date --iso-8601=minutes | perl -pe 's/[^0-9]+//g').mkv"
  
  V="$(xdpyinfo | grep dimensions | perl -pe 's/.* ([0-9]+x[0-9]+) .*/$1/g')"
  
  ffmpeg -video_size "$V" -framerate 25 -f x11grab -i :0.0 -f pulse -i "$A" -f pulse -i default \
  
      -filter_complex amerge -ac 1 -preset veryfast "$F"

  Basically that script results into the following command :

  ffmpeg -video_size 1366x768 -framerate 25 -f x11grab -i :0.0 -f pulse -ac 2 -i default output.mkv

  In this case, with -ac 2, the audio that gets added with the captured video is of some mic. I’m using a laptop and don’t have a mic, so I don’t exactly know which device the outside sounds get added from but it does. But no audio from the main audio that I can hear through the headphone jack doesn’t get added to the video.

  If I use -ac 1 instead, the video now gets the outside audio as well as the internal audio. That’s good. But how do I restrict the video to only add internal audio, not add audio gotten from mic or something similar.

  I don’t know if it’ll help, but adding it anyway. From man mpv :

         -ac[:stream_specifier] channels (input/output,per-stream)
  
             Set the number of audio channels. For output streams it is set by
  
             default to the number of input audio channels. For input streams this
  
             option only makes sense for audio grabbing devices and raw demuxers and
  
             is mapped to the corresponding demuxer options.

• FFMPEG memory leak on FLV video frame decoding

  10 août 2014, par Michael IV

  I am decoding FLV video on Windows using FFMPEG latest dev version(20140810) .Monitoring memory consumption of my program process I found the memory footprint constantly increasing.I do packet deallocation and also tried to delete and then reallocate the AVFrame anew on each decode.But it doesn’t help.I read on some threads people pointing out there is an internal memory leak in H264 decoder but I have seen no official confirmation of it nor any solution.
  Here is how I decode a frame :

  AVPacket packet;
  
  av_read_frame(_ifmt_ctx, &packet);
  
  
  
  if (packet.stream_index == _in_video_stream->index) 
  
  {
  
      int isGotVideoFrame = 0;
  
  
  
      // Decode video frame
  
      ret = avcodec_decode_video2(_dec_in_video_ctx, _src_video_frame,
  
                     &isGotVideoFrame, &packet);
  
  
  
      if (1 == isGotVideoFrame) 
  
      {
  
          sws_scale(_sws_ctx, (const uint8_t * const*) _src_video_frame->data,
  
                    _src_video_frame->linesize, 0,_inVideoHeight, 
  
                    _dst_video_frame->data, _dst_video_frame->linesize);
  
  
  
          uint8_t* dest = new uint8_t[_numBytes];
  
          memcpy(dest, _dst_video_frame->data[0], _numBytes);
  
  
  
          av_free_packet(&packet);
  
          _frames_cache.push_back(dest);
  
      }
  
  
  
      av_frame_unref(_src_video_frame);
  
      av_frame_free(&_src_video_frame);
  
      _src_video_frame = av_frame_alloc();
  
  }

  Then in another place on each frame I delete ’dest’ from the vector :

      uint8_t * fr = _frames_cache.front();
  
      _frames_cache.erase(_frames_cache.begin());
  
      delete [] fr ;