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• ffmpeg not converting via PHP script

  16 mars 2014, par user3331834

  Essentially, I have this code :

  if(in_array($ext,$audio)&&($ext!=="flac")){
  
      exec("ffmpeg -i -loglevel 'verbose' ".$fileName.".".$ext." ".$fileName.".flac null >/dev/null 2>/var/www/resources/ffmpegAudio.log &",$ffmpegOutput);
  
      print_r($ffmpegOutput);
  
      $editApproveStatus="Audio entry approved. File converted.";
  
  }

  Ultimately, my goal is to convert files and show a live progress of the conversion (or at least something that updates every few seconds), and running in the background, so that the same page can be used to convert further files.

  Now I'm already stuck, because the conversion just isn't working. I know that the preceding code should be fine, since it makes it all the way to this if statement above, and no errors are being throw up by the PHP. However, my log output shows :

  ffmpeg version 0.8.10-6:0.8.10-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Feb  6 2014 20:59:46 with gcc 4.8.1
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  -loglevel: No such file or directory

  Which also leads me to another question : If ffmpeg is deprecated, and avconv is the way to do, can I still use the exec code in my PHP as is (replacing the ffmpeg bit with avconv) ? From what I've seen so far on the avconv page, it looks similar, but I can't be certain that it's exactly the same.

  So my two questions : Why isn't the file being converted, and is there any change in the syntax between avconv and ffmpeg ?

• Can't play rtp stream from ffmpeg/avconv, no data received

  6 mars 2014, par Foo Barazz

  I started avserver on my Raspberry Pi, webcam attached I read from /dev/video0 with

  pi@raspberrypi $ avconv -f video4linux2 -i /dev/video0 -vcodec mpeg2video -r 25 - pix_fmt yuv420p -me_method epzs -b 2600k -bt 256k -f rtp rtp://192.168.0.124:8090
  
  
  
  avconv version 0.8.6-6:0.8.6-1+rpi1, Copyright (c) 2000-2013 the Libav developers
  
    built on Mar 31 2013 13:58:10 with gcc 4.6.3
  
  [video4linux2 @ 0x17c1720] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, video4linux2, from '/dev/video0':
  
    Duration: N/A, start: 615.594215, bitrate: 36864 kb/s
  
      Stream #0.0: Video: rawvideo, yuyv422, 320x240, 36864 kb/s, 30 tbr, 1000k tbn, 30 tbc
  
  [buffer @ 0x17c16e0] w:320 h:240 pixfmt:yuyv422
  
  [avsink @ 0x17c2f00] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x17c34c0] w:320 h:240 fmt:yuyv422 -> w:320 h:240 fmt:yuv420p flags:0x4
  
  Output #0, rtp, to 'rtp://192.168.0.124:8090':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0: Video: mpeg2video, yuv420p, 320x240, q=2-31, 2600 kb/s, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg2video)
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 192.168.0.124
  
  t=0 0
  
  a=tool:libavformat 53.21.1
  
  m=video 8090 RTP/AVP 32
  
  b=AS:2600
  
  
  
  Press ctrl-c to stop encoding
  
  frame=  576 fps= 25 q=2.0 size=    2133kB time=23.00 bitrate= 759.8kbits/s dup=390 drop=0    
  
  frame=  590 fps= 25 q=2.0 size=    2191kB time=23.56 bitrate= 762.0kbits/s dup=400 drop=0    
  
  frame= 1320 fps= 25 q=2.0 size=    4932kB time=52.76 bitrate= 765.8kbits/s dup=908 drop=0
  
  ...

  Seems to work fine, it reads data from the webcam.

  Now I'm trying to simply play with ffplay from my Mac with

  $ ffplay rtp://192.168.0.124:8090
  
  ffplay version 1.2.4 Copyright (c) 2003-2013 the FFmpeg developers
  
    built on Mar  1 2014 15:18:21 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1/include/openjpeg-1.5 '
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
      nan A-V:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan A-V:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan A-V:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0 
  
      ...

  The video doesn't open and it seems to not reading any data from the Raspberry Pi.

  I use the default configuration for avserver.
  The webcam is definitely working as I managed to just write out images with avconv from it.

  What did I miss ?

• how to optimize x264 for online live education scene？

  21 juillet 2020, par Longshan DU

  I am working on a x264 optimization project for online live education. Often, the teachers are sitting before the camera, and doesn't have big motion, and the background are the same (exception light changes). And is there some papers that I can refer to that can reduce the bit rate or improve the video quality ?