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• FFMPEG : Change Video during encoding (using mapping)

  18 octobre 2013, par Tchoupi

  I'm currently trying to concat several videos using a complex filter :

  ffmpeg.exe -threads 8 -i "D:\Temporary0.mp4"  -i "D:\Temporary1.mp4"  -i "D:\Temporary2.mp4"  -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a]  concat=n=3:v=1:a=1 [v] [a] " -map "[v]" -map "[a]"  -vcodec libx264 -b 2500000 -s 1920:1080 -y D:\EditedVideo.mp4

  This command work fine.
  Edit : Here the output of the command :

  ffmpeg version N-56297-g7ac6c63 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 15 2013 18:02:28 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 43.100 / 52. 43.100
  
    libavcodec     55. 31.101 / 55. 31.101
  
    libavformat    55. 16.102 / 55. 16.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 84.100 /  3. 84.100
  
    libswscale      2.  5.100 /  2.  5.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Temporary0.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.16.102
  
    Duration: 00:00:02.91, start: 0.033333, bitrate: 8998 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 8965 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Temporary1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.16.102
  
    Duration: 00:00:05.00, start: 0.023220, bitrate: 846 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 835 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 1 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Temporary2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.16.102
  
    Duration: 00:00:04.35, start: 0.033333, bitrate: 4684 kb/s
  
      Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4581 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #2:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Please use -b:a or -b:v, -b is ambiguous
  
  [libx264 @ 04f617e0] using SAR=1/1
  
  [libx264 @ 04f617e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 04f617e0] profile High, level 4.0
  
  [libx264 @ 04f617e0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subm
  
  e=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_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=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=25 scenecut=40 intra_refresh=0 rc_lookahead=40 r
  
  c=abr mbtree=1 bitrate=2500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'D:\EditedVideo.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.16.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 2500 kb/s, 12800 tbn, 25 tbc
  
      Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 (h264) -> concat:in0:v0
  
    Stream #0:1 (aac) -> concat:in0:a0
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    Stream #1:1 (aac) -> concat:in1:a0
  
    Stream #2:0 (h264) -> concat:in2:v0
  
    Stream #2:1 (aac) -> concat:in2:a0
  
    concat:out:v0 -> Stream #0:0 (libx264)
  
    concat:out:a0 -> Stream #0:1 (libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=  306 fps= 43 q=-1.0 Lsize=    3557kB time=00:00:12.29 bitrate=2369.4kbits/s dup=1 drop=0
  
  video:3353kB audio:193kB subtitle:0 global headers:0kB muxing overhead 0.288541%
  
  [libx264 @ 04f617e0] frame I:3     Avg QP:21.78  size:173526
  
  [libx264 @ 04f617e0] frame P:112   Avg QP:25.76  size: 17363
  
  [libx264 @ 04f617e0] frame B:191   Avg QP:31.04  size:  5068
  
  [libx264 @ 04f617e0] consecutive B-frames: 11.8% 14.4%  2.0% 71.9%
  
  [libx264 @ 04f617e0] mb I  I16..4: 14.6% 82.7%  2.6%
  
  [libx264 @ 04f617e0] mb P  I16..4:  3.5%  8.8%  0.2%  P16..4: 30.1%  5.3%  2.6%  0.0%  0.0%    skip:49.4%
  
  [libx264 @ 04f617e0] mb B  I16..4:  0.7%  1.1%  0.0%  B16..8: 21.6%  1.2%  0.1%  direct: 1.2%  skip:74.1%  L0:47.0% L1:50.6% BI: 2.4%
  
  [libx264 @ 04f617e0] final ratefactor: 25.69
  
  [libx264 @ 04f617e0] 8x8 transform intra:70.8% inter:88.5%
  
  [libx264 @ 04f617e0] coded y,uvDC,uvAC intra: 34.3% 50.2% 7.2% inter: 7.3% 13.3% 0.3%
  
  [libx264 @ 04f617e0] i16 v,h,dc,p: 22% 33%  7% 37%
  
  [libx264 @ 04f617e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 22% 34%  4%  5%  4%  5%  4%  5%
  
  [libx264 @ 04f617e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 22% 18%  5%  6%  6%  5%  6%  4%
  
  [libx264 @ 04f617e0] i8c dc,h,v,p: 60% 21% 16%  3%
  
  [libx264 @ 04f617e0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 04f617e0] ref P L0: 62.6%  9.1% 19.8%  8.5%
  
  [libx264 @ 04f617e0] ref B L0: 85.3% 12.6%  2.1%
  
  [libx264 @ 04f617e0] ref B L1: 92.4%  7.6%
  
  [libx264 @ 04f617e0] kb/s:2243.97
  
  [libvo_aacenc @ 0420e900] 1 frames left in the queue on closing

  I would like to update this command to change volume during concat and encode time :

  ffmpeg.exe -threads 8 -i "D:\Temporary0.mp4"  -i "D:\Temporary1.mp4"  -i "D:\Temporary2.mp4"  -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a]  concat=n=3:v=1:a=1 [v] [a] " -map "[v]" -map "[a]"  -vcodec libx264 -b 2500000 -s 1920:1080 -af volume="volume=20dB:precision=double" -y D:\EditedVideo.mp4

  This command is executed but the audio stream is not altered with the +20db

  PS : If I do a simple encoding command like

  ffmpeg.exe -i source -vcodec libx264 -af volume="volume=20dB:precision=double" -y output

  Command work fine and audio stream is modified.

  So How can I Do to concat my videos and change audio volume at the same time ?

  Thanks

• Trouble concatenating with ffmpeg (threads)

  4 janvier 2014, par mistypants

  I'm writing a batch script to automate one of my video editing processes. I've gotten everything done up to the final step, when I concatenate the video intro (1080.avi) with the video itself, then output. Here's the concatenate part of the script :

  ffmpeg -i 1080.avi -i %input%-lossless.avi ^
  
  -filter_complex "[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]" ^
  
  -map "[v]" -map "[a]" ^
  
  -c:v libx264 -preset veryslow -pix_fmt yuv420p ^
  
  -b:a 160k ^
  
  -threads 2 %input%-final.mp4

  It seems to work fine, but my computer overheats (it's a laptop) while it runs. I had this problem with just simple conversions and ffmpeg, so I added the -threads 2 part which eliminated the problem. It's back now.

  Did I mess up something in the script, or does concatenating just use more of the CPU ? If the latter, could I just decrease it to 1 thread ?

• X264 Error message when capturing video

  2 mai 2015, par sav

  I’m writing a program to save some webcam video to a file. I’m using the x264 codec found here
  x264

  When I try writing frames to a file I get this error message poping up.
  

  x264vfw [warning] : Few frames probably would be lost. Ways to fix
  this :

  x264vfw [warning] : -if you use VirtualDub or its fork than you can
  enable ’VirtualDub Hack’ option

  x264vfw [warning] : -you can enable ’File’ output mode

  x264vfw [warning] : -you can enable ’Zero Latency’ option

  I found this VirtualDub Hack but then I’m not using virtual dub.
  I’m not sure what the File output mode and zero latency mean.

  I think the problem is related to the codec since when I change to using a different codec, everything works fine. I’m using C# and emgu but I dont think thats where the problem lies.

  EDIT

  In case the code helps

  public static void StartCapture()
  
  {
  
      try
  
      {
  
          capture = new Capture();
  
          capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH, 1920);  //1920
  
          capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT, 1080); //1080
  
  
  
          CaptureOutput = new VideoWriter
  
          (
  
              "capture output.avi",
  
              CvInvoke.CV_FOURCC('X','2','6','4'),
  
              50, //fps
  
              (int)capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH), 
  
              (int)capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT), 
  
              true
  
          );
  
  
  
          if (capture != null)
  
          {
  
              capture.ImageGrabbed += SaveFrame;
  
              capture.Start();
  
          }
  
      }
  
      catch (Exception e)
  
      {
  
          MessageBox.Show(e.ToString());
  
      }
  
  }
  
  
  
  static void SaveFrame(System.Object sender, EventArgs e)
  
  {
  
      Image video;
  
      video = capture.RetrieveBgrFrame();
  
      CaptureOutput.WriteFrame(video);
  
  }