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• Final Rendered Video is Sped Up Compared to Animation Played in Processing

  15 janvier 2016, par Nightlife

  Recently I made an Audio Visualizer in Processing. From there I wanted to render the animation created in Processing into a mp4 file. I am on a windows computer, and am using ffmpeg to convert my TIF files produced in Processing into mp4.

  When I do this I am able to render the images into an mp4 file, but when I playback this file the animation is sped up compared to the animation when I play it on Processing. Because of this the animation does not sync with the audio when I combine the mp4 file and audio on a video editing program.

  When I set my frame rate to 25 and have the limit on the number of frames to be 250 and render it into a mp4 file it is 10 seconds long like it should be, but it contains more than 10 seconds of the animation when compared to the animation played directly in Processing.

  I have no idea why this is so any help will be much appreciated.

  My Processing code :

  import ddf.minim.*;
  
  import ddf.minim.analysis.*;
  
  
  
  Minim minim;
  
  AudioPlayer player;
  
  PImage img;
  
  FFT fft;
  
  
  
  void setup() {
  
    size(728, 546);
  
  
  
    minim = new Minim(this);
  
  
  
    // this loads mysong.wav from the data folder as a stream with a internal buffer of size 1024
  
    player = minim.loadFile("new_years_good.mp3");
  
    fft = new FFT(player.bufferSize(), player.sampleRate());
  
    player.play();
  
    img= loadImage("cat-in-shades-.jpg");
  
    frameRate(25);
  
  }
  
  
  
  void draw() {
  
  
  
  
  
    image(img, 0, 0);
  
    //tint(0, 100, 150);
  
    stroke(255);
  
  
  
    strokeWeight(4);
  
    float a = 0;
  
  
  
    float angle = (2*PI) / 200;
  
  
  
  
  
    fft.forward(player.mix);
  
  
  
  
  
    for(int i=0; i < player.bufferSize() - 1; i++) {
  
  
  
     //player.mix.get(i) is a value between [-1,1]
  
  
  
      float x = 250 + cos(a) * (20 * player.mix.get(i) + 100);
  
      float x2 = 540 + cos(a) * (20 * player.mix.get(i) + 100);    
  
  
  
      float y = 230 + sin(a) * (20 * player.mix.get(i) + 100);
  
      float y2 = 240 + sin(a) * (20 * player.mix.get(i) + 100);
  
  
  
  
  
      float xFinal = 250 + cos(a+angle) * (20 * player.mix.get(i+1) + 100);
  
      float x2Final = 540 + cos(a+angle) * (20 * player.mix.get(i+1) + 100);
  
  
  
  
  
      float yFinal = 230 + sin(a+angle) * (20 * player.mix.get(i+1) + 100);    
  
      float y2Final = 240 + sin(a+angle) * (20 * player.mix.get(i+1) + 100);    
  
  
  
  
  
      line(x,y,xFinal,yFinal);
  
      line(x2,y2,x2Final,y2Final);
  
      a += angle;  
  
  
  
  
  
  
  
    }
  
    noStroke();  
  
    fill(255, 0, 0, 128);
  
    for(int i = 0; i < 250; i++)
  
    {
  
      float b = fft.getBand(i);
  
      float yAxis = random(-b, b) + 480;
  
      float xAxis = i*3;
  
      ellipse(xAxis, yAxis, b, b);
  
    }
  
    saveFrame("frame-####.tif");
  
    if(frameCount>250)
  
      {
  
        noLoop();
  
        stop();
  
      }
  
  
  
  }
  
  
  
  void stop() {
  
    player.close();
  
    minim.stop();
  
  
  
    super.stop();
  
  }

  What I input into the command line (as one line) on the cmd :

  C:\Users\Robert\Documents\Processing\AudioVisulizer>ffmpeg -i C:\Users\Robert\Do
  
  cuments\Processing\AudioVisulizer\frame-%04d.tif -r 25 -pix_fmt yuv420p smallVid
  
  .mp4

  What it outputted :

      ffmpeg version N-77836-g62dfe1d Copyright (c) 2000-2016 the FFmpeg developers
  
        built with gcc 5.2.0 (GCC)
  
        configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
      isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
      le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
      enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
      ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
      le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
      able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
      ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
       --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
      e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --
  
      enable-lzma --enable-decklink --enable-zlib
  
        libavutil      55. 13.100 / 55. 13.100
  
        libavcodec     57. 22.100 / 57. 22.100
  
        libavformat    57. 21.101 / 57. 21.101
  
        libavdevice    57.  0.100 / 57.  0.100
  
        libavfilter     6. 23.100 /  6. 23.100
  
        libswscale      4.  0.100 /  4.  0.100
  
        libswresample   2.  0.101 /  2.  0.101
  
        libpostproc    54.  0.100 / 54.  0.100
  
      Input #0, image2, from 'C:\Users\Robert\Documents\Processing\AudioVisulizer\fram
  
      e-%04d.tif':
  
        Duration: 00:00:10.04, start: 0.000000, bitrate: N/A
  
          Stream #0:0: Video: tiff, rgb24, 728x546, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      [libx264 @ 00000092cd5e3700] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
      AVX FMA3 AVX2 LZCNT BMI2
  
      [libx264 @ 00000092cd5e3700] profile High, level 3.0
  
      [libx264 @ 00000092cd5e3700] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC cod
  
      ec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 r
  
      ef=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed
  
      _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pski
  
      p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
      mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_
  
      adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=2
  
      5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6
  
      0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
      Output #0, mp4, to 'smallVid.mp4':
  
        Metadata:
  
          encoder         : Lavf57.21.101
  
          Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 728x54
  
      6, q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc57.22.100 libx264
  
          Side data:
  
            unknown side data type 10 (24 bytes)
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (tiff (native) -> h264 (libx264))
  
      Press [q] to stop, [?] for help
  
      frame=   52 fps=0.0 q=28.0 size=      77kB time=00:00:00.00 bitrate=N/A speed=
  
      frame=   74 fps= 65 q=28.0 size=     127kB time=00:00:00.88 bitrate=1178.0kbits/
  
      frame=   93 fps= 57 q=28.0 size=     164kB time=00:00:01.64 bitrate= 820.0kbits/
  
      frame=  113 fps= 52 q=28.0 size=     201kB time=00:00:02.44 bitrate= 676.3kbits/
  
      frame=  136 fps= 51 q=28.0 size=     245kB time=00:00:03.36 bitrate= 596.3kbits/
  
      frame=  157 fps= 49 q=28.0 size=     282kB time=00:00:04.20 bitrate= 550.2kbits/
  
      frame=  178 fps= 48 q=28.0 size=     324kB time=00:00:05.04 bitrate= 527.2kbits/
  
      frame=  199 fps= 47 q=28.0 size=     362kB time=00:00:05.88 bitrate= 504.1kbits/
  
      frame=  219 fps= 46 q=28.0 size=     403kB time=00:00:06.68 bitrate= 494.2kbits/
  
      frame=  242 fps= 46 q=28.0 size=     452kB time=00:00:07.60 bitrate= 486.8kbits/
  
      frame=  251 fps= 38 q=-1.0 Lsize=     623kB time=00:00:09.96 bitrate= 512.3kbits
  
      /s speed=1.52x
  
      video:619kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
  
      verhead: 0.607807%
  
      [libx264 @ 00000092cd5e3700] frame I:2     Avg QP:21.74  size: 56596
  
      [libx264 @ 00000092cd5e3700] frame P:66    Avg QP:23.36  size:  2523
  
      [libx264 @ 00000092cd5e3700] frame B:183   Avg QP:31.50  size:  1932
  
      [libx264 @ 00000092cd5e3700] consecutive B-frames:  0.8%  4.0%  6.0% 89.2%
  
      [libx264 @ 00000092cd5e3700] mb I  I16..4: 10.9% 72.6% 16.5%
  
      [libx264 @ 00000092cd5e3700] mb P  I16..4:  0.0%  0.0%  0.2%  P16..4:  4.4%  2.3
  
      %  3.3%  0.0%  0.0%    skip:89.7%
  
      [libx264 @ 00000092cd5e3700] mb B  I16..4:  0.0%  0.0%  0.5%  B16..8:  3.2%  2.0
  
      %  2.3%  direct: 1.3%  skip:90.7%  L0:50.9% L1:42.2% BI: 7.0%
  
      [libx264 @ 00000092cd5e3700] 8x8 transform intra:50.2% inter:10.1%
  
      [libx264 @ 00000092cd5e3700] coded y,uvDC,uvAC intra: 83.4% 32.6% 14.2% inter: 3
  
      .5% 0.2% 0.0%
  
      [libx264 @ 00000092cd5e3700] i16 v,h,dc,p: 22%  8%  8% 62%
  
      [libx264 @ 00000092cd5e3700] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 12% 19%  6%  9%
  
       9%  9%  9%  9%
  
      [libx264 @ 00000092cd5e3700] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 14% 22%  6%  9%
  
       8%  8%  5%  6%
  
      [libx264 @ 00000092cd5e3700] i8c dc,h,v,p: 74% 12% 12%  2%
  
      [libx264 @ 00000092cd5e3700] Weighted P-Frames: Y:0.0% UV:0.0%
  
      [libx264 @ 00000092cd5e3700] ref P L0: 41.8%  3.9% 24.3% 30.0%
  
      [libx264 @ 00000092cd5e3700] ref B L0: 64.5% 25.0% 10.5%
  
      [libx264 @ 00000092cd5e3700] ref B L1: 82.2% 17.8%
  
      [libx264 @ 00000092cd5e3700] kb/s:504.56

• ffmpeg video conversion from webm to mp4 is adding lag to the video

  21 janvier 2016, par Hemant Kumar

  Hi I am trying to convert video from .webm extension to .mp4 extension and it is adding lags to the video, also not showing me the full video.

  I am using following video conversion command.

  "ffmpeg -i {$input} -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ".fix_video_orientation($input)."' -threads 0 -ab 64k -s {$resolution}  -movflags faststart -metadata:s:v:0 rotate=0 {$output}";

  "fix_video_orientation" function is given below. It rotate the resulting video if video while recording is rotated to certain angle.

  function fix_video_orientation($input){
  
  
  
  $return= ", transpose=1 ";
  
  
  
  $dd= exec("ffprobe -of json -show_streams  {$input}   | grep rotate");
  
  
  
  if(!empty($dd)){
  
  
  
  $dd=explode(":",$dd);
  
  $rotate=str_replace(",","",str_replace('"',"",$dd[1]));
  
  
  
  if($rotate=="90")return $return;
  
  
  
  else if ($rotate=="180") return ", transpose=2,transpose=2 ";
  
  
  
  else if($rotate == "270") return ", transpose=2 ";
  
  }

  Currently above script is supporting "flv","avi","mp4","mkv","mpg","wmv","asf","webm","mov","3gp","3gpp" extensions, also the script is supporting the resulting .mp4 file to play on all browsers and devices.

  For query :

  ffmpeg -i <server path="path">/g9zyy2qg54qp1l5spo2-mergedFile.webm -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 <server path="path">/g9zyy2qg54qp1l5spo2-mergedFile5.mp4
  
  </server></server>

  Console output :

  ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, matroska,webm, from '<server path="path">/g9zyy2qg54qp1l5spo2-mergedFile.webm':
  
    Metadata:
  
      encoder         : Lavf55.33.100
  
    Duration: 00:00:13.53, start: 0.000000, bitrate: 387 kb/s
  
      Stream #0:0: Audio: vorbis, 44100 Hz, stereo, fltp
  
      Stream #0:1: Video: vp8, yuv420p, 320x240, SAR 1:1 DAR 4:3, 1k fps, 1k tbr, 1k tbn, 1k tbc (default)
  
  [libx264 @ 0x38fcf40] using SAR=1/1
  
  [libx264 @ 0x38fcf40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x38fcf40] profile High, level 5.2
  
  [libx264 @ 0x38fcf40] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '<server path="path">/g9zyy2qg54qp1l5spo2-mergedFile5.mp4':
  
    Metadata:
  
      encoder         : Lavf55.33.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 500 kb/s, 16k tbn, 1k tbc (default)
  
      Metadata:
  
        rotate          : 0
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 64 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (vp8 -> libx264)
  
    Stream #0:0 -> #0:1 (vorbis -> aac)
  
  Press [q] to stop, [?] for help
  
  frame=  358 fps=0.0 q=39.0 size=      27kB time=00:00:00.74 bitrate= 295.4kbits/frame=  723 fps=691 q=41.0 size=      57kB time=00:00:01.39 bitrate= 335.1kbits/frame= 1410 fps=706 q=45.0 size=     108kB time=00:00:01.74 bitrate= 509.0kbits/frame= 1777 fps=710 q=45.0 size=     134kB time=00:00:02.13 bitrate= 512.7kbits/frame= 2126 fps=707 q=45.0 size=     164kB time=00:00:02.50 bitrate= 535.0kbits/frame= 2497 fps=710 q=45.0 size=     191kB time=00:00:02.85 bitrate= 547.8kbits/frame= 2869 fps=708 q=45.0 size=     225kB time=00:00:03.20 bitrate= 575.7kbits/frame= 3226 fps=707 q=45.0 size=     250kB time=00:00:03.59 bitrate= 568.2kbits/frame= 3586 fps=709 q=46.0 size=     282kB time=00:00:03.94 bitrate= 585.7kbits/frame= 3956 fps=710 q=45.0 size=     305kB time=00:00:04.59 bitrate= 543.8kbits/frame= 4358 fps=710 q=46.0 size=     340kB time=00:00:04.71 bitrate= 591.1kbits/frame= 4751 fps=712 q=45.0 size=     362kB time=00:00:05.10 bitrate= 581.3kbits/frame= 5133 fps=713 q=45.0 size=     393kB time=00:00:05.50 bitrate= 584.9kbits/frame= 5510 fps=715 q=45.0 size=     416kB time=00:00:05.89 bitrate= 578.5kbits/frame= 5880 fps=715 q=45.0 size=     448kB time=00:00:06.24 bitrate= 587.6kbits/frame= 6250 fps=715 q=45.0 size=     472kB time=00:00:06.64 bitrate= 582.3kbits/frame= 6651 fps=715 q=45.0 size=     501kB time=00:00:06.98 bitrate= 587.1kbits/frame= 7012 fps=713 q=50.0 size=     524kB time=00:00:07.68 bitrate= 559.0kbits/frame= 7396 fps=714 q=45.0 size=     551kB time=00:00:07.75 bitrate= 582.5kbits/frame= 7771 fps=714 q=47.0 size=     575kB time=00:00:08.10 bitrate= 581.1kbits/frame= 8139 fps=714 q=50.0 size=     604kB time=00:00:08.52 bitrate= 580.8kbits/frame= 8509 fps=715 q=46.0 size=     628kB time=00:00:08.87 bitrate= 580.4kbits/frame= 8885 fps=715 q=46.0 size=     655kB time=00:00:09.19 bitrate= 583.1kbits/frame= 9233 fps=714 q=46.0 size=     677kB time=00:00:09.54 bitrate= 581.2kbits/frame= 9603 fps=714 q=46.0 size=     706kB time=00:00:09.96 bitrate= 580.6kbits/frame= 9975 fps=714 q=46.0 size=     728kB time=00:00:10.65 bitrate= 559.8kbits/frame=10376 fps=715 q=46.0 size=     757kB time=00:00:10.75 bitrate= 577.0kbits/frame=10730 fps=714 q=46.0 size=     780kB time=00:00:11.07 bitrate= 577.1kbits/frame=11090 fps=713 q=47.0 size=     808kB time=00:00:11.42 bitrate= 579.7kbits/frame=11447 fps=713 q=46.0 size=     832kB time=00:00:11.79 bitrate= 578.0kbits/frame=11802 fps=712 q=48.0 size=     858kB time=00:00:12.14 bitrate= 578.5kbits/frame=12181 fps=713 q=46.0 size=     880kB time=00:00:12.51 bitrate= 576.3kbits/frame=12563 fps=713 q=46.0 size=     908kB time=00:00:12.95 bitrate= 573.9kbits/frame=13527 fps=715 q=46.0 size=     960kB time=-577014:-32:-22.-77 bitrate=N/A [mp4 @ 0x3912e00] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=13527 fps=713 q=-1.0 Lsize=    1139kB time=00:00:13.52 bitrate= 689.8kbits/s dup=13036 drop=0    
  
  video:863kB audio:107kB subtitle:0 data:0 global headers:0kB muxing overhead 17.479137%
  
  [libx264 @ 0x38fcf40] frame I:55    Avg QP:33.13  size:  6072
  
  [libx264 @ 0x38fcf40] frame P:3409  Avg QP:32.90  size:    95
  
  [libx264 @ 0x38fcf40] frame B:10063 Avg QP:39.74  size:    22
  
  [libx264 @ 0x38fcf40] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
  
  [libx264 @ 0x38fcf40] mb I  I16..4: 25.7% 69.5%  4.8%
  
  [libx264 @ 0x38fcf40] mb P  I16..4:  0.2%  0.2%  0.0%  P16..4:  1.4%  0.1%  0.4%  0.0%  0.0%    skip:97.7%
  
  [libx264 @ 0x38fcf40] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.7%  L0:41.0% L1:58.9% BI: 0.0%
  
  [libx264 @ 0x38fcf40] 8x8 transform intra:67.9% inter:94.6%
  
  [libx264 @ 0x38fcf40] direct mvs  spatial:86.6% temporal:13.4%
  
  [libx264 @ 0x38fcf40] coded y,uvDC,uvAC intra: 36.1% 36.9% 1.7% inter: 0.1% 0.1% 0.0%
  
  [libx264 @ 0x38fcf40] i16 v,h,dc,p: 32% 27%  9% 31%
  
  [libx264 @ 0x38fcf40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 13% 18%  7%  7%  8%  8%  9%  8%
  
  [libx264 @ 0x38fcf40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 16%  7%  7%  9% 10%  9%  7%  8%
  
  [libx264 @ 0x38fcf40] i8c dc,h,v,p: 73% 14%  9%  4%
  
  [libx264 @ 0x38fcf40] Weighted P-Frames: Y:0.6% UV:0.0%
  
  [libx264 @ 0x38fcf40] ref P L0: 77.5% 12.2%  9.1%  0.9%  0.2%  0.0%
  
  [libx264 @ 0x38fcf40] ref B L0: 86.6% 13.2%  0.2%  0.0%
  
  [libx264 @ 0x38fcf40] ref B L1: 89.8% 10.2%
  
  [libx264 @ 0x38fcf40] kb/s:522.05
  
  </server></server>

• ffmpeg generating out of sync audio/video file

  2 mars 2013, par marcelorocks

  I am trying to convert a flv video to mp4 using a264, but the result video has a out of sync audio/video. Audio seems ok but video seems slow and therefore out of sync. I am a newbie on video conversion so any help is appreciated.

  Here is the command I am running :

  /opt/local/bin/ffmpeg -i complaint.flv -f mp4 -vcodec libx264 -acodec aac -copyts -strict experimental -fpre /opt/local/share/ffmpeg/libx264-lossless_slow.ffpreset -ab 44k -threads 0 -crf 23 complaint.mp4

  And the printout :

  Desktop  /opt/local/bin/ffmpeg -i complaint.flv -f mp4 -vcodec libx264 -acodec aac -copyts -strict experimental -fpre /opt/local/share/ffmpeg/libx264-lossless_slow.ffpreset -ab 44k -threads 0 -crf 23 complaint.mp4
  
  ffmpeg version 0.7.8, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jan 12 2012 21:12:26 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  
    configuration: --prefix=/opt/local --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libopenjpeg --enable-libxvid --enable-libx264 --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [flv @ 0x7fe57a04ac00] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from 'complaint.flv':
  
    Metadata:
  
      duration        : 7
  
      creationdate    : Thu Jan 12 23:47:24
  
      description     : Recorded using VideoRecording example.
  
    Duration: 00:00:06.61, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 288x288, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 11025 Hz, mono, s16
  
  File 'complaint.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x7fe579c32cc0] w:288 h:288 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [libx264 @ 0x7fe57a044600] using cpu capabilities: none!
  
  [libx264 @ 0x7fe57a044600] profile High, level 4.2
  
  [libx264 @ 0x7fe57a044600] 264 - core 118 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x33 me=umh subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.41 aq=1:1.00
  
  Output #0, mp4, to 'complaint.mp4':
  
    Metadata:
  
      duration        : 7
  
      creationdate    : Thu Jan 12 23:47:24
  
      description     : Recorded using VideoRecording example.
  
      encoder         : Lavf52.111.0
  
      Stream #0.0: Video: libx264, yuv420p, 288x288, q=0-69, 200 kb/s, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: aac, 11025 Hz, mono, s16, 44 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Press [q] to stop, [?] for help
  
  frame= 6557 fps=106 q=-1.0 Lsize=     685kB time=00:00:03.62 bitrate=1549.1kbits/s dup=6367 drop=0    
  
  video:615kB audio:17kB global headers:0kB muxing overhead 8.361360%
  
  frame I:27    Avg QP:19.98  size:  8242
  
  [libx264 @ 0x7fe57a044600] frame P:6530  Avg QP:30.71  size:    62
  
  [libx264 @ 0x7fe57a044600] mb I  I16..4: 11.1% 79.3%  9.6%
  
  [libx264 @ 0x7fe57a044600] mb P  I16..4:  0.1%  0.2%  0.0%  P16..4:  1.2%  0.2%  0.3%  0.0%  0.0%    skip:98.0%
  
  [libx264 @ 0x7fe57a044600] 8x8 transform intra:77.8% inter:64.9%
  
  [libx264 @ 0x7fe57a044600] coded y,uvDC,uvAC intra: 75.3% 81.3% 33.3% inter: 0.5% 0.7% 0.1%
  
  [libx264 @ 0x7fe57a044600] i16 v,h,dc,p: 78%  9% 10%  3%
  
  [libx264 @ 0x7fe57a044600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 11% 32%  3%  4%  5%  2%  5%  4%
  
  [libx264 @ 0x7fe57a044600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 56%  7%  9%  3%  4%  7%  3%  7%  3%
  
  [libx264 @ 0x7fe57a044600] i8c dc,h,v,p: 45% 15% 34%  6%
  
  [libx264 @ 0x7fe57a044600] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fe57a044600] ref P L0: 80.5%  9.5% 10.0%
  
  [libx264 @ 0x7fe57a044600] kb/s:767.20