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• Setting B frames in a video with ffmpeg

  30 juin 2013, par Robert Cantarutti

  According to ffmpeg manual, setting -g is to define space between "I" frames, and setting -bf to use "B" frames. The former I got, but the latter not.

  The goal : I'm trying to have a video with a GOP 3,12 (M= 3, N=12).
  That means : 2 "B" frames separating each "P" frames, and "I" frames with 12 frames of distance. Or simply : "IBBPBBPBBPBBI"

  I think that I got only the N=12, using the commands below :

  1. ffmpeg -s cif -r 30 -b 64000 -bt 3200 -g 12 -y -i video.yuv -vcodec mpeg4 video.m4v
  2. MP4Box -hint -mtu 1460 -fps 30 -add video.m4v video.mp4
  3. ffmpeg -y -i video.mp4 video_ref.yuv
  4. ../cmd/psnr 352 288 420 video.yuv video_ref.yuv > psnr_ref.txt
  5. ../cmd/mp4trace -f -s 192.168.0.2 12346 video.mp4 > trace
  6. head -n 20 trace

  Result :

  [robert@10-2Fontes]$ head -n 20 trace
  
  1   H   12002   9   0.000
  
  2   P   11479   8   0.034
  
  3   P   12021   9   0.066
  
  4   P   11239   8   0.099
  
  5   P   5407    4   0.134
  
  6   P   2735    2   0.166
  
  7   P   1014    1   0.199
  
  8   P   850 1   0.232
  
  9   P   619 1   0.265
  
  10  P   979 1   0.298
  
  11  P   813 1   0.331
  
  12  P   806 1   0.364
  
  13  H   5109    4   0.396

  *Note, the most important is the command -g 12 in ffmpeg, but I writing all the commands. The video that I'm using is the "highway", from cif page videos : http://www2.tkn.tu-berlin.de/research/evalvid/cif.html

  I don't know why the result trace is using "H" instead of "I".

  I tried to put -bf 2 in ffmpeg command, but did not worked (I think because I saw no "B" indications in the result)

  List item

  ffmpeg -s cif -r 30 -b 64000 -bt 3200 -g 12 -bf 2 -y -i video.yuv -vcodec mpeg4 video.m4v

  Result :

  [robert@10-2Fontes]$ head -n 20 trace
  
  1   H   12002   9   0.001
  
  2   P   11479   8   0.034
  
  3   P   12021   9   0.067
  
  4   P   11239   8   0.100
  
  5   P   5407    4   0.132
  
  6   P   2735    2   0.166
  
  7   P   1014    1   0.199
  
  8   P   850 1   0.232
  
  9   P   619 1   0.265
  
  10  P   979 1   0.298
  
  11  P   813 1   0.331
  
  12  P   806 1   0.363
  
  13  H   5109    4   0.400

• stream_decoder.c : Set obj->num_comments before return

  20 mars 2016, par Erik de Castro Lopo

  stream_decoder.c : Set obj->num_comments before return
  Make sure obj-num_comments gets set on failure conditions.
  Patch-from : Robert Shih <robertshih@google.com>
  

  • [DH] src/libFLAC/stream_decoder.c

• 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