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• Improve ffmpeg CPU usage by compramising quality

  20 juin 2015, par Hardik Juneja

  I am using FFMpeg for screen capturing.
  I am looking for a screen capturing tool that will run on 1000 of VMs (windows and mac).The VMs have limited CPU (1 core) and 2GB ram and No GPU.

  Currently I invoke ffmpeg with

  ffmpeg  -y -framerate 8 -f dshow -f gdigrab -i "desktop"  -c:v libx264  -crf 0 -preset ultrafast -threads 0 temp.mkv

  I am using gdigrab to capture screen ? Is there any better options that might reduce cpu usage ? or changing the encoder or format ?

  I am aiming for 4-5% reduction in CPU usage.

  Thanks in advance

• ffmpeg error while converting to mp4 Error while opening encoder for output stream #0.0

  20 mars 2016, par Josh

  I am trying to convert various file types to mp4 to be displayed using ffmpeg, but i keep getting the error :

  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Another piece that looks important is :

  [libx264 @ 0x93caef0] broken ffmpeg default settings detected

  [libx264 @ 0x93caef0] use an encoding preset (e.g. -vpre medium)

  [libx264 @ 0x93caef0] preset usage : -vpre -vpre

  [libx264 @ 0x93caef0] speed presets are listed in x264 —help

  [libx264 @ 0x93caef0] profile is optional ; x264 defaults to high

  The latest code I am running is :

  ffmpeg -i source -s 320x240 -r 30000/1001 -b 200k -bt 240k -vcodec libx264 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -maxrate 10M -bufsize 10M -acodec libfaac -ac 2 -ar 48000 -ab 192k destination

  I have seen a few other people with this issue, but their fixes didn’t work for some reason.

  In case it matters : ultimately this will be used in php, though I am trying to get it working first via putty

  EDIT: : Here is the full thing as requested(using a wmv, have tested wmv and flv) :

       ~ >> ffmpeg -i path.wmv -s 320x240 -r 30000/1001 -b 200k -r 29.97 -bt 240k -vcodec libx264 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -maxrate 10M -bufsize 10M -acodec libfaac -ac 2 -ar 48000 -ab 192k path.mp4
  
  FFmpeg version SVN-r26076, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 28 2012 17:55:47 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --enable-version3 --enable-gpl --enable-nonfree --enable-shared --enable-postproc --enable-avfilter --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --disable-ffplay --disable-indevs --disable-outdevs --disable-demuxer=v4l --disable-demuxer=v4l2 --disable-mmx
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.97 (30000/1001)
  
  Input #0, asf, from 'path.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 0
  
      title           : Wildlife in HD
  
      artist          :
  
      copyright       : © 2008 Microsoft Corporation
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
    Duration: 00:00:30.09, start: 8.000000, bitrate: 6977 kb/s
  
      Stream #0.0(eng): Audio: wmav2, 44100 Hz, 2 channels, s16, 192 kb/s
  
      Stream #0.1(eng): Video: vc1, yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc
  
  File 'path.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x9ce9eb0] w:1280 h:720 pixfmt:yuv420p
  
  [scale @ 0x9ce8f70] w:1280 h:720 fmt:yuv420p -> w:320 h:240 fmt:yuv420p flags:0x4
  
  [libx264 @ 0x9ce9ef0] broken ffmpeg default settings detected
  
  [libx264 @ 0x9ce9ef0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x9ce9ef0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x9ce9ef0] speed presets are listed in x264 --help
  
  [libx264 @ 0x9ce9ef0] profile is optional; x264 defaults to high
  
  Output #0, mp4, to 'path.mp4':
  
      Stream #0.0(eng): Video: libx264, yuv420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
      Stream #0.1(eng): Audio: libfaac, 48000 Hz, 2 channels, s16, 192 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

  Thanks for any help

• ffmpeg : How to get list of available codecs with PHP ?

  9 août 2013, par IIIOXIII

  Problem is, I am trying to convert (through php), a .3gp (or any video format) file to ogg.

  When I do not specify -vcodec and -acodec, the video is converted, but does not have any audio.

  I had read here and other places that I need to specify -acodec libvorbis, however, when I specify the codec as libvorbis, the conversion fails : video converts to 0byte file.

  Basically, I am trying to determine if the codec specified is actually part of the ffmpeg build I am using as a process of narrowing down my issue.

  Code that produces full length video without sound :

  $srcFile = 'anyvideo.3gp';
  
  $destFile = 'anyvideo.ogg';
  
  $ffmpegPath = 'path/to/ffmpeg.exe';
  
  $ffmpegObj = new ffmpeg_movie($srcFile);
  
  $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth()); 
  
  $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight());
  
  $srcFPS = $ffmpegObj->getFrameRate(); 
  
  $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);
  
  $srcAR = $ffmpegObj->getAudioSampleRate();
  
  $srcLen = $ffmpegObj->getDuration();
  
  
  
  exec($ffmpegPath." -i ".$srcFile." -ar ".$srcAR." -s ".$srcWidth."x".$srcHeight." ". $destFile);

  And the code that produces 0byte file :

  exec($ffmpegPath." -i ".$srcFile." -acodec libvorbis -ar ".$srcAR." -s ".$srcWidth."x".$srcHeight." ".$destFile);

  So, my question is, how do I determine the codec's available to ffmpeg using PHP ? Can it even be done ?

  UPDATED - ANSWER BELOW