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• FFMpeg : Webcam capture not fast enough. Ffmpeg dies half way (Linux)

  19 août 2013, par user763410

  I am trying to capture webcam output in liux/ubuntu. I have a chico webcam (lenovo laptop). I am running inside a VMWARE virtual machine. The capture is not proceeding beyond 10 seconds. can you please help.

  The command I used is :

  $ ffmpeg -y  -f video4linux2 -r 20 -s 160x120 -i /dev/video0 -acodec libfaac -ab 128k  /tmp/web.avi

  The most important message I am getting is :

  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected

  Complete message from ffmpeg :

  ffmpeg version N-55159-gf118b41 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 18 2013 09:09:13 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libass --prefix=/opt/ffmpeg --enable-debug --enable-libfreetype
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
  [video4linux2,v4l2 @ 0x9e43fa0] The V4L2 driver changed the video from 160x120 to 320x240
  
  [video4linux2,v4l2 @ 0x9e43fa0] The driver changed the time per frame from 1/20 to 1/15
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 6424.338678, bitrate: 18432 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 18432 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
  
  Codec AVOption ab (set bitrate (in bits/s)) specified for output file #0 (/tmp/web.avi) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Output #0, avi, to '/tmp/web.avi':
  
    Metadata:
  
      ISFT            : Lavf55.12.102
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240, q=2-31, 200 kb/s, 20 tbn, 20 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected
  
  /dev/video0: Invalid data found when processing input
  
  frame=   29 fps= 14 q=3.5 Lsize=      87kB time=00:00:01.45 bitrate= 490.0kbits/s    
  
  video:80kB audio:0kB subtitle:0 global headers:0kB muxing overhead 7.760075%
  
  [video4linux2,v4l2 @ 0x9e43fa0] Some buffers are still owned by the caller on close.

• php ming flash slideshow to mp4/avi

  19 août 2013, par Stefan

  After hours of searching and trying i finally got a nice script together that generates a good looking Flash .swf file with a nice transaction in between de images.
  It works great if you access the swf file directly in a browser, depending on the amount of images the flash created takes anywhere between 10 and 60 seconds.
  But when uploading to Youtube the movie created flashed by in one second.
  Because swf isnt really a accepted fileformat for Youtube we decided to convert the flash file to mp4 or avi using ffmpeg.
  Unfortunally that didnt work, it had the same effect as the youtube movie.
  We had a old version of ffmpeg and updated that to a recent version and tried to convert again with the same result.
  The main thing i see is that ffmpeg cant see the swf file duration and bitrate, they are both 'N/A' while were do set them in the php script.

  Now i have to admit i havent really tested with the new version because the commandline options are a little different but ill work on that after i post this.
  In the previous version we tried setting the framerate of the source swf file, but that didnt work either.

  Anyone here that can has a idea ? it would be greatly appriciated.

  PHP Ming Script :

        $fps = 30;
  
           foreach($objects as $objectId => $images){
  
                  // START FLASH MOVIE
  
                  $m = new SWFMovie();
  
                  $m->setDimension($width, $height);
  
                  $m->setBackground(0, 0, 0);
  
                  $m->setRate($fps);
  
                  $m->setFrames(count($images)*202); //count(images)* 2 breaks *($fps*$breakTime)+22(fadeOut))
  
  
  
                  $i = 0;
  
                  foreach($images as $image){
  
  
  
                      // REMOVE THE BACKGROUND IMAGE
  
                      if($behind){
  
                          $m->remove($behind);
  
                      }
  
                      // # REMOVE
  
  
  
                      // LOAD NEW IMAGE
  
                      $img = new SWFBitmap(fopen($image,"rb"));
  
                      $pic = $m->add($img);
  
                      $pic->setdepth(3);
  
                      // # LOAD
  
  
  
                      // BREAK TIME
  
                      for($j=1;$j<=($fps*$breakTime);$j++){
  
                          $m->nextFrame();
  
                      }
  
                      $m->remove($pic);
  
                      // # BREAK
  
  
  
                      // LOAD THE NEXT IMAGE AS BACKGROUND, IF LAST IMAGE, LOAD FIRST
  
                      $nextBackgrondImage =($images[$i+1]) ? $images[$i+1] : $images[0] ;
  
                      $img = new SWFBitmap(fopen($nextBackgrondImage,"rb"));
  
                      $behind = $m->add($img);
  
                      $behind->setdepth(2);
  
                      // # LOAD
  
  
  
                      // AND FADE OUT AGAIN
  
                      $img = fadeOut($image, $width, $height);
  
                      $pic = $m->add($img);
  
                      $pic->setdepth(3);
  
                      // # FADE OUT
  
  
  
                      // BREAK TIME
  
                      for($j=1;$j<=($fps*$breakTime);$j++){
  
                          $m->nextFrame();
  
                      }
  
                      $m->remove($pic);
  
                      # BREAK
  
                      $i++;
  
                  }       
  
                  $m->save('./flash/'.$nvmId.'_'.$objectId.'.swf');   
  
              unset($m); 
  
              }
  
  }

  FFMPEG version :

  root@server:~# ffmpeg -version
  
  \FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 15 2013 20:43:21 with gcc 4.4.5
  
    configuration: --enable-libmp3lame --enable-libtheora --enable-libx264 
  
    --enable-libgsm --enable-postproc --enable-libxvid --enable-libfaac --enable-pthreads 
  
    --enable-libvorbis --enable-gpl --enable-x11grab --enable-nonfree
  
    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
  
  FFmpeg SVN-r26402
  
  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

  FFMPEG command

  root@server:~# ffmpeg -r 30  -i '/pathTo/public_html/flash/73003_8962011.swf' -vcodec libx264 /pathTo/public_html/flash/out.mp4
  
  
  
  [swf @ 0x16c2510] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, swf, from '/pathTo/public_html/flash/73003_8962011.swf':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 360x480, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  [buffer @ 0x16d5850] w:360 h:480 pixfmt:yuvj420p
  
  [libx264 @ 0x16d4d80] broken ffmpeg default settings detected
  
  [libx264 @ 0x16d4d80] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x16d4d80] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x16d4d80] speed presets are listed in x264 --help
  
  [libx264 @ 0x16d4d80] profile is optional; x264 defaults to high
  
  Output #0, mp4, to &#39;/pathTo/public_html/out.mp4&#39;:
  
      Stream #0.0: Video: libx264, yuvj420p, 360x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

• Invalid and inefficient vfw-avi packed B frames detected

  16 août 2015, par seyong

  I got message Invalid and inefficient vfw-avi packed B frames detected while video was converted.

  After converting the video, I checked pixel values in video. Values are different from original video. Why values change after converting ?

  and I use lossless intra-frame video codec ’ffv1’

  command :
  ffmpeg
  -i input_video -vcodec ffv1 -acodec pcm_s16le output_video

  ffmpeg version 1.1.1 Copyright (c) 2000-2013 the FFmpeg developers  
  
  built on Jan 20 2013 23:05:28 with gcc 4.7.2 (GCC)   configuration:
  
  --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib   libavutil      52. 13.100 / 52. 13.100   libavcodec     54. 86.100 / 54. 86.100   libavformat    54. 59.106 / 54. 59.106   libavdevice    54.  3.102 / 54.  3.102   libavfilter     3. 32.100 /  3. 32.100   libswscale      2.  1.103 / 
  
  2.  1.103   libswresample   0. 17.102 /  0. 17.102   libpostproc    52.  2.100 / 52.  2.100 [mpeg4 @ 02e218c0] Invalid and inefficient vfw-avi packed B frames detected Input #0, avi, from
  
  'D:\video_output\avi\1.avi':   Metadata:
  
      encoder         : Lavf54.59.106   Duration: 00:04:25.52, start: 0.000000, bitrate: 2744 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (DX50 / 0x30355844), yuv420p, 720x544 [SAR 1:1 DAR 45:34], 25 tbr, 25 tbn, 25
  
  tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 192 kb/s Output #0, matroska, to 'D:\video_output\avi\1_2.mkv': 
  
  Metadata:
  
      encoder         : Lavf54.59.106
  
      Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 720x544 [SAR 1:1 DAR 45:34], q=2-31, 200 kb/s, 1k tbn, 25 tbc
  
      Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Stream mapping:   Stream #0:0 -> #0:0 (mpeg4 -> ffv1)   Stream #0:1 ->
  
  #0:1 (ac3 -> pcm_s16le) Press [q] to stop, [?] for help [mpeg4 @ 02e27920] Invalid and inefficient vfw-avi packed B frames detected
  
  frame=   36 fps=0.0 q=0.0 size=    1916kB time=00:00:01.56
  
  bitrate=10008.5kbits/s
  
  ...
  
  frame= 6565 fps= 46 q=0.0 size=  862611kB time=00:04:22.72
  
  bitrate=26897.5kbits/s     frame= 6594 fps= 46 q=0.0 size=  864799kB
  
  time=00:04:23.87 bitrate=26848.0kbits/s     frame CRC mismatch frame=
  
  6629 fps= 46 q=0.0 size=  866407kB time=00:04:25.20
  
  bitrate=26763.2kbits/s     frame= 6638 fps= 46 q=0.0 Lsize=  866521kB
  
  time=00:04:25.56 bitrate=26730.5kbits/s    
  
  
  
  video:816725kB audio:49668kB subtitle:0 global headers:0kB muxing
  
  overhead 0.014713%

  c++ code

  void ProcessVideo::processFrame1(string fileName1, string fileName2) {
  
  this->capture.open(fileName1);
  
  if (!this->capture.isOpened())
  
      cout<<"video1 error";
  
  
  
  get_videoInfo();
  
  
  
  set_videoInfo();
  
  
  
  this->capture1.open(fileName2);
  
  if (!this->capture1.isOpened())
  
      cout<<"video2 error";
  
  
  
  cv::Mat frame; // current video frame
  
  cv::Mat frame1; // current video frame
  
  
  
  cv::namedWindow("image1");
  
  cv::namedWindow("image2");
  
  
  
  int count = 0;
  
  int count1 = 0;
  
  
  
  while (1) {
  
      capture >> frame;
  
      capture1 >> frame1;
  
  
  
      if (frame.empty()) {
  
          //break;
  
          cout<<"Frame1 Empty"<::iterator it=frame.begin();
  
      cv::Mat_::iterator itend=frame.end();
  
  
  
      if (frame1.empty()) {
  
          //break;
  
          cout<<"Frame2 Empty"<::iterator it1=frame1.begin();
  
      cv::Mat_::iterator itend1=frame1.end();
  
  
  
      if(frame.empty() && frame1.empty()) {
  
          break;
  
      }
  
  
  
      count1++;
  
  
  
      int i=0,j=0,k=0;
  
  
  
      while(it!=itend && it1!=itend1) {
  
          ++it;
  
          ++it1;
  
  
  
          count++;
  
  
  
          if((*it)[0] != (*it1)[0]){
  
              i++;
  
          }
  
          else if((*it)[1] != (*it1)[1]){
  
              j++;
  
          }
  
          else if((*it)[2] != (*it1)[2]){
  
              k++;
  
          }
  
      }
  
      cout<<"count diffrent pixel : "<capture.release();
  
  this->capture1.release();

  }