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• h264 : fully check cropping amount from sps

  26 août 2014, par Vittorio Giovara

  h264 : fully check cropping amount from sps
  Even if sps.crop is true, the cropping amount may be zero.
  
  Fixes a sample with a valid but broken container cropping.
  

  • [DH] libavcodec/h264_slice.c

• FFMPEG preset is not found ? Linux Cent OS 6

  25 août 2012, par Darius

  I ran this command

  ffmpeg -i v-16418145218d8d7abdaabec46beb22ecffd2f5d1625.flv -y -acodec aac -ac 2 -ab 160k -vcodec libx264 -vpre iPod640 -vpre slow -f mp4 -threads 0 OUTPUT.mp4

  Got this response :

  [flv @ 0x10ff670]Estimating duration from bitrate, this may be inaccurate
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 25.00 (25/1)
  
  Input #0, flv, from 'v-16418145218d8d7abdaabec46beb22ecffd2f5d1625.flv':
  
    Metadata:
  
      duration        : 14
  
      width           : 320
  
      height          : 240
  
      videodatarate   : 500
  
      framerate       : 25
  
      videocodecid    : 2
  
      audiodatarate   : 0
  
      audiosamplerate : 22050
  
      audiosamplesize : 16
  
      stereo          : true
  
      audiocodecid    : 2
  
      filesize        : 912970
  
    Duration: 00:00:13.92, start: 0.000000, bitrate: 576 kb/s
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 512 kb/s, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: mp3, 22050 Hz, 2 channels, s16, 64 kb/s
  
  File for preset 'iPod640' not found

  But after doing a find, this is what I found.

  /usr/share/ffmpeg/libx264-ipod320.ffpreset
  
  /usr/share/ffmpeg/libx264-ipod640.ffpreset **** ITS HERE ******
  
  /usr/share/ffmpeg/libx264-lossless_fast.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_max.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_medium.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_slow.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_slower.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_ultrafast.ffpreset
  
  /usr/share/ffmpeg/libx264-main.ffpreset
  
  /usr/share/ffmpeg/libx264-max.ffpreset
  
  /usr/share/ffmpeg/libx264-medium.ffpreset
  
  /usr/share/ffmpeg/libx264-medium_firstpass.ffpreset
  
  /usr/share/ffmpeg/libx264-normal.ffpreset
  
  /usr/share/ffmpeg/libx264-placebo.ffpreset
  
  /usr/share/ffmpeg/libx264-placebo_firstpass.ffpreset
  
  /usr/share/ffmpeg/libx264-slow.ffpreset
  
  /usr/share/ffmpeg/libx264-slow_firstpass.ffpreset
  
  /usr/share/ffmpeg/libx264-slower.ffpreset

  I alos tried with -vpre libx264-ipod640 and still no luck. I get preset libx264-ipod640 is not found.... Do i have to enable presets somehow ? ffmpeg — enable presets ? or something ?

  ** EDIT : My ffmpeg version info **

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  FFmpeg 0.6.5
  
  libavutil     50.15. 1 / 50.15. 1
  
  libavcodec    52.72. 2 / 52.72. 2
  
  libavformat   52.64. 2 / 52.64. 2
  
  libavdevice   52. 2. 0 / 52. 2. 0
  
  libavfilter    1.19. 0 /  1.19. 0
  
  libswscale     0.11. 0 /  0.11. 0
  
  libpostproc   51. 2. 0 / 51. 2. 0

• Faster way to write image to Process.StandardInput.BaseStream

  4 septembre 2012, par Hasibii

  Im trying to send a lot of desktop captured images to an encoders (FFmpeg) stdin.

  The following code example works.

  the CaptureScreen() function provides an image in 5-10 ms.

  If I save the image in a MemoryStream it takes almost no time.

  But I can only save 1 image every 45 ms to
  proc.StandardInput.BaseStream.

  public void Start(string bitrate, string buffer, string fps, string rtmp, string resolution, string preset)
  
  {
  
      proc.StartInfo.FileName = myPath + "\\ffmpeg.exe";
  
      proc.StartInfo.Arguments = "-f image2pipe -i pipe:.bmp -vcodec libx264 -preset " + preset + " -maxrate " + bitrate + "k -bufsize " +
  
      buffer + "k -bt 10 -r " + fps + " -an -y test.avi"; //+ rtmp;
  
      proc.StartInfo.UseShellExecute = false;
  
      proc.StartInfo.RedirectStandardInput = true;
  
      proc.StartInfo.RedirectStandardOutput = true;
  
  
  
      proc.Start();
  
  
  
      Stopwatch st = new Stopwatch();
  
      BinaryWriter writer = new BinaryWriter(proc.StandardInput.BaseStream);
  
      System.Drawing.Image img;
  
  
  
      st.Reset();
  
      st.Start();
  
  
  
      for (int z = 0; z < 100; z++)
  
      {
  
          img = ScrCap.CaptureScreen();
  
          img.Save(writer.BaseStream, System.Drawing.Imaging.ImageFormat.Bmp);
  
          img.Dispose();
  
      }
  
  
  
      st.Stop();
  
      System.Windows.Forms.MessageBox.Show(st.ElapsedMilliseconds.ToString());
  
  }

  The question is :

  Can I do the saving process faster ?

  I try to get stable 60 fps this way