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• aarch64 : NEON asm for intra luma deblocking

  14 octobre 2014, par Janne Grunau

  aarch64 : NEON asm for intra luma deblocking
  deblock_luma_intra[0]_neon is 2 times fastes,
  
  deblock_luma_intra[1]_neon is 4 times faster.
  

  • [DH] common/aarch64/deblock-a.S
  • [DH] common/deblock.c

• ffmpeg error creating thumbnail different frame rate

  18 décembre 2012, par KJS

  When using this at the command line I get very bad images with only grey or stripes in them.
  It seems "the frame rate differs from container frame rate : 59.94 (60000/1001) -> 29.97 (30000/1001)".

  Is there any way I can fix this in the ffmpeg statement ?

  ffmpeg -ss 00:00:10 -i FILENAME.mp4 -vframes 1 FILENAME.jpg

  This is the output I get :

  FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    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-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Jun 13 2010 23:44:18, gcc: 4.1.2 20080704 (Red Hat 4.1.2-48)

  Seems stream 0 codec frame rate differs from container frame rate : 59.94 (60000/1001) -> 29.97 (30000/1001)

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'FILENAME.mp4':
  
    Duration: 00:03:36.36, start: 0.000000, bitrate: 1305 kb/s
  
      Stream #0.0(eng): Video: h264, yuv420p, 640x428, 29.97 tbr, 29.97 tbn, 59.94 tbc
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16
  
  Output #0, image2, to 'FILENAME.jpg':
  
      Stream #0.0(eng): Video: mjpeg, yuvj420p, 640x428, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  [h264 @ 0x307f6b0]brainfart cropping not supported, this could look slightly wrong ...
  
  [h264 @ 0x307f6b0]AVC: Consumed only 14978 bytes instead of 14984
  
  [h264 @ 0x307f6b0]AVC: Consumed only 1147 bytes instead of 1153
  
  [h264 @ 0x307f6b0]Missing reference picture
  
  [h264 @ 0x307f6b0]AVC: Consumed only 1947 bytes instead of 1953
  
  [h264 @ 0x307f6b0]Missing reference picture
  
  [h264 @ 0x307f6b0]AVC: Consumed only 1870 bytes instead of 1876
  
  [h264 @ 0x307f6b0]Missing reference picture
  
      Last message repeated 1 times
  
  [h264 @ 0x307f6b0]AVC: Consumed only 810 bytes instead of 816
  
  [h264 @ 0x307f6b0]Missing reference picture
  
      Last message repeated 1 times
  
  [h264 @ 0x307f6b0]AVC: Consumed only 955 bytes instead of 961
  
  [h264 @ 0x307f6b0]Missing reference picture
  
      Last message repeated 1 times
  
  [h264 @ 0x307f6b0]AVC: Consumed only 1036 bytes instead of 1042
  
  [h264 @ 0x307f6b0]Missing reference picture
  
      Last message repeated 1 times
  
  [h264 @ 0x307f6b0]AVC: Consumed only 998 bytes instead of 1004
  
  [h264 @ 0x307f6b0]Missing reference picture
  
  frame=    1 fps=  0 q=3.3 Lsize=      -0kB time=0.03 bitrate=  -5.3kbits/s
  
  video:14kB audio:0kB global headers:0kB muxing overhead -100.149568%

• Extracting JPG Image From MP4 Video

  17 mars 2015, par michael hanon

  I am using the below method to extract an image from a uploaded video and placing the image into a folder.

      private string GeneratePreviewImageMP4(string FileName, HttpPostedFile file, string ProperPath)
  
  {
  
      string inputfile = System.IO.Path.Combine(Server.MapPath(ProperPath), file.FileName);
  
      string ext = System.IO.Path.GetExtension(FileName);
  
      string thumbpath = AppDomain.CurrentDomain.BaseDirectory + "Reports\\TrainingLibrary\\Videothumbnails\\";
  
      string thumbname = thumbpath + FileName.Replace(ext, "") + ".jpg";
  
      string thumbargs = "-i " + inputfile + " -ss 00:00:25.435 -qscale:v 2 -vframes 1 " + thumbname;
  
      Process thumbproc = new Process();
  
      thumbproc.StartInfo.FileName = "C:\\FFMPEG\\Bin\\ffmpeg.exe";
  
      thumbproc.StartInfo.Arguments = thumbargs;
  
      thumbproc.StartInfo.UseShellExecute = false;
  
      thumbproc.StartInfo.CreateNoWindow = false;
  
      thumbproc.StartInfo.RedirectStandardOutput = false;
  
      try
  
      {
  
          thumbproc.Start();
  
      }
  
      catch (Exception ex)
  
      {
  
          Response.Write(ex.Message);
  
      }
  
      thumbproc.WaitForExit();
  
      thumbproc.Close();
  
  
  
      return FileName.Replace(ext, ".jpg");
  
  
  
  }

  The issue, is that once the image is extracted, I get locked out of the folder. No body has admin rights to that folder. We have to restart the Server just to restore access to that folder.

  This is only at certain times, most of the time it works great, but one out of ten times there will be an issue.

  Anyone now why this is happening ? Does it play the video to extract the image, but does not stop the video ?