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• PHP and FFmpeg : works on terminal but ffmpeg error when in shell_exec

  25 janvier 2014, par user2128983

  I'm in front of a problem I can't solve !

  I try to convert videos using the ffmpeg tool. When I paste the command on the server terminal (ssh root), it works fine. But, when I try in my PHP script using shell_exec, it returns the error "Error while opening encoder ...".

  Here is the command I use :

  ffmpeg -y -i VIDEOIN.mov -preset medium -strict -2 -c:v libx264 -b:v 1000k -pass 1 -f mp4 VIDEOOUT.mp4 null 1>logfile.txt 2>&1 &

  And my PHP script :

  $dir = 'videos/'.$uuid;
  
  $out = $dir.'video.mp4';
  
  $log = $dir.'transcoding_log.txt';
  
  $preset = 'medium';
  
  $bitrate = 1000;
  
  
  
  $cmd = "ffmpeg -y -i ".$in." -preset ".$preset." -strict -2 -c:v libx264 -b:v ".$bitrate."k -pass 1 -f mp4 ".$out." null 1>".$log." 2>&1 &";
  
  @file_put_contents($dir.'cmd.log', $cmd); // to debug
  
  shell_exec($cmd);

  Here is the log file created in the PHP script :

  ffmpeg version 1.0.8 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Sep 12 2013 11:57:09 with gcc 4.7 (Debian 4.7.2-5)
  
  configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis  libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, matroska,webm, from 'videos/18352678af96ecb5/origin.webm':
  
    Metadata:
  
      creation_time   : 2010-05-20 08:21:12
  
    Duration: 00:00:32.48, start: 0.000000, bitrate: 533 kb/s
  
      Stream #0:0(eng): Video: vp8, yuv420p, 640x360, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: vorbis, 44100 Hz, mono, s16 (default)
  
  [libx264 @ 0x19c05a0] using SAR=1/1
  
  [libx264 @ 0x19c05a0] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 0x19c05a0] ratecontrol_init: can't open stats file
  
  Output #0, mp4, to 'videos/18352678af96ecb5/video.mp4':
  
      Stream #0:0(eng): Video: h264, yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, pass 1,     90k tbn, 25 tbc (default)
  
      Stream #0:1(eng): Audio: none, 44100 Hz, mono, s16, 128 kb/s (default)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp8 -> libx264)
  
    Stream #0:1 -> #0:1 (vorbis -> libfaac)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as     bit_rate, rate, width or height

  EDIT 1 :

  I compiled ffmpeg with the latest revision but the problem still occurs.

• Unable to mux two live streams from webcam using ffmpeg in linux

  24 octobre 2013, par user2902884

  We are trying to multiplex two live streams from webcams into an output file using ffmpeg in linux as follows,

  fmpeg -i "http://10.41.2.57:8090/webcam.asf" -i "http://10.41.2.49:8090/webcam.asf" -map 0:0 -map 1:0 -t 60 "/home/../MuxLiveStream1.flv" 

  ffmpeg stops responding at after a while and the console shows the following output,

  FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.3, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.3 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Jan 24 2013 19:42:59, gcc: 4.4.3
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 2.00 (2/1)
  
  Input #0, flv, from 'http:10.41.2.154:8090/webcam.flv':
  
    Duration: 00:00:00.00, start: 1587016.579000, bitrate: 200 kb/s
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 200 kb/s, 2 tbr, 1k tbn, 1k tbc
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 2.00 (2/1)
  
  Input #1, flv, from 'http:10.41.2.57:8090/webcam.flv':
  
    Duration: 00:00:00.00, start: 1587230.806000, bitrate: 200 kb/s
  
      Stream #1.0: Video: flv, yuv420p, 320x240, 200 kb/s, 2 tbr, 1k tbn, 1k tbc
  
  Number of stream maps must match number of output streams

  Is there a mistake in the command or is there anything else that needs to be done ?

• Ffplay : Change filter options while playing audio

  11 février 2018, par artha

  I am trying to apply equalizer filters to ffplay while it is playing an audio. Is it possible ?

  Like start playing the audio with the command :

  ffplay -i foo.wav

  Then while foo.wav is playing change it to

  ffplay -af "equalizer=f=1000:width_type=h:width=200:g=-10" -i foo.wav

  without stopping the audio.