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• How to achieve 2 pass encoding using x264 ?

  6 avril 2017, par Kim Kardashian

  is there a parameter in the x264_param_t structure
  or do I have to send frames to x264 dll twice.. ?
  Because I just use encoder_encode function and that returns nal units .
  Im guessing it should be a combination of a parameter and using encoder_encode twice.

  Here is how i initialize params and link to libx264

      InitializeSettings(){
  
      x264_param_default_preset(&m_pXParam, "medium", "zerolatency");
  
      x264_param_apply_profile(&m_pXParam, "baseline");
  
      m_pXParam.i_width = cx;
  
      m_pXParam.i_height = cy;
  
      m_pXParam.i_fps_num = fps;
  
      m_pXParam.i_fps_den = 1;
  
      // rate control
  
      m_pXParam.i_keyint_max = fps - 5;
  
      //m_pXParam.rc.f_rf_constant_max = fps + 5;
  
      // rate control
  
      m_pXParam.rc.i_qp_constant=18;
  
      m_pXParam.rc.i_qp_min=18;
  
      m_pXParam.rc.i_qp_max=18;}
  
  
  
      x264_picture_alloc(&m_xPicture, X264_CSP_I420 , m_pXParam.i_width, m_pXParam.i_height);
  
      m_xPicture.img = x264img;
  
      m_iframe_size = x264_encoder_encode(m_xEncoder, &m_xNals, &m_iNal, &m_xPicture, &m_xPictureOut);  

  @nobody555 Thanks ! I had another question about x264_param_apply_fastfirstpass function :

  /* x264_param_apply_fastfirstpass:
  
   *      If first-pass mode is set (rc.b_stat_read == 0, rc.b_stat_write == 1),
  
   *      modify the encoder settings to disable options generally not useful on
  
   *      the first pass. */

  what options are they talking about ?

• FFMPEG command (For capturing keyframe) executes, but not creating the output file

  3 mai 2017, par sforsandeep

  Im trying with an FFMPEG command using the latest FFMPEG exe. The command executes fine. But the output file is not being created.

  Here is the command I tried from DOS prompt. According to a colleagues comment, it was (The command) working before without any trouble.

  D:\Utilities\FFMPegVideoManager\FFMPEG_updated\ffmpeg.exe -i
  
  "M:\content\video.mp4" -y -ss 1 -frames 1
  
  "E:\frame\testtest.jpg"

  The output after the execution is

  C:\Users\ABCD>D:\Utilities\FFMPegVideoManager\FFMPEG_updated\ffmpeg.exe -i "M:\FTP Home Directory\LocalUser\WAP_UAT\Processing Folder\wspa1\Delivery\San4\content\0101_eatingredpanda.mp4" -y -ss 1 -frames 1 "E:\sandeep\testtest.jpg"
  
  ffmpeg version N-85266-g1229007 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 59.100 / 55. 59.100
  
    libavcodec     57. 90.100 / 57. 90.100
  
    libavformat    57. 72.100 / 57. 72.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 83.100 /  6. 83.100
  
    libswscale      4.  7.100 /  4.  7.100
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'M:\content\0101_eatingredpanda.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      creation_time   : 1970-01-01T00:00:00.000000Z
  
      encoder         : Lavf52.31.0
  
    Duration: 00:00:19.52, start: 0.000000, bitrate: 12506 kb/s
  
      Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 12373 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000000006238340] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to 'E:\sandeep\testtest.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf57.72.100
  
      Stream #0:0(eng): Video: mjpeg, yuvj420p(pc), 960x540 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.90.100 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  frame=    1 fps=0.0 q=6.6 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.447x
  
  video:48kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown 

  So from the output detials it seems to be fine. So why its not creating the output file ? Thanks

• Looping back and forth through frames with ffmpeg

  18 mai 2017, par sebb

  I have a set of ten PNG frames that I’d like to convert to a "boomerang style" mp4 file (i.e go from frame 1 to frame 10, then from 9 to 2). I’d like to find something similar to ImageMagick’s patrol cycle, but can’t figure out how to to it with ffmpeg.

  I thought it would be possible to do this using concat but :

  • I think it’s dirty
  • My command simply does not work :)

  Here’s my command so far :

  -framerate 5 -i "concat:01.png|02.png|03.png|04.png|05.png|06.png|07.png|08.png|09.png|10.png|09.png|08.png|07.png|06.png|05.png|04.png|03.png|02.png" -pix_fmt yuv420p output.mp4

  I get a video file but it just goes from 1 to 10 once.

  Here’s ffmpeg’s saying hello :

  ffmpeg version N-86098-g3fefaea Copyright (c) 2000-2017 the FFmpeg developers
  
  
  
    built with gcc 6.3.0 (GCC)
  
  
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
  
  
    libavutil      55. 63.100 / 55. 63.100
  
  
  
    libavcodec     57. 96.101 / 57. 96.101
  
  
  
    libavformat    57. 72.101 / 57. 72.101
  
  
  
    libavdevice    57.  7.100 / 57.  7.100
  
  
  
    libavfilter     6. 89.101 /  6. 89.101
  
  
  
    libswscale      4.  7.101 /  4.  7.101
  
  
  
    libswresample   2.  8.100 /  2.  8.100
  
  
  
    libpostproc    54.  6.100 / 54.  6.100

  Anyone has an idea ?

  Thanks !