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• Why when converting avi video file to another format the first 2-3 seconds are blurry ?

  13 juin 2016, par Sharon Gabriel

  The source file is avi. The target new file is mp4.
  The first 2-3 seconds are blurry. Then after 2-3 second the whole video until the end is smooth and sharp.

  Another sub question is how come that 2.16 GB avi file after conversion using ffmpeg is only 1.34 MB ? It’s not part of a movie or something it’s collection of screenshots images i did in c# and then used AviFile Lib to create from them a avi video file. and yet from 2.16 GB to 1.34 MB and it keep the quality i think almost the same quality like the original avi file and the same duration 2:20 minutes.

  About the blurry problem this is my code where i set the ffmpeg arguments and set the process :

  private void Convert()
  
          {
  
              try
  
              {
  
                  Control.CheckForIllegalCrossThreadCalls = false;
  
                  if (ComboBox1.SelectedIndex == 3) 
  
                  {
  
                      strFFCMD = " -i " + (char)34 + InputFile + (char)34 + " -c:v libx264 -s 1920x1080 -pix_fmt yuv420p -qp 18 -profile high444 -c:a libvo_aacenc -b:a 128k -ar 44100 -ac 2 -y " + OutputFile;
  
                  }    
  
                  psiProcInfo.FileName = exepath;
  
                  psiProcInfo.Arguments = strFFCMD;        
  
                  psiProcInfo.UseShellExecute = false;      
  
                  psiProcInfo.WindowStyle = ProcessWindowStyle.Hidden;    
  
                  psiProcInfo.RedirectStandardError = true;             
  
                  psiProcInfo.RedirectStandardOutput = true;         
  
                  psiProcInfo.CreateNoWindow = true;                 
  
                  prcFFMPEG.StartInfo = psiProcInfo;           
  
                  prcFFMPEG.Start();
  
                  ffReader = prcFFMPEG.StandardError;
  
  
  
                  do
  
                  {
  
                      if (Bgw1.CancellationPending)
  
                      {
  
                          return;
  
                      }
  
                      Button5.Enabled = true;
  
                      Button3.Enabled = false;
  
                      strFFOUT = ffReader.ReadLine();                    
  
                      RichTextBox1.Text = strFFOUT;
  
                      if (strFFOUT != null)
  
                      {
  
                          if (strFFOUT.Contains("frame="))
  
                          {
  
                              currentFramestr = strFFOUT.Substring(7, 6).Trim();
  
                              Regex rx = new Regex(@"^\d+");
  
                              Match m = rx.Match(currentFramestr);
  
                              if (m.Success)
  
                              {
  
                                  currentFrameInt = System.Convert.ToInt32(m.Value);
  
                              }
  
                          }
  
                      }
  
                      string percentage = ((double)ProgressBar1.Value / (double)ProgressBar1.Maximum * 100.0).ToString();
  
                      textBox3.Text = ProgressBar1.Value.ToString();                    
  
                      ProgressBar1.Maximum = FCount + 1;
  
                      ProgressBar1.Value = (currentFrameInt);
  
                      Label12.Text = "Current Encoded Frame: " + currentFrameInt;
  
                      Label11.Text = percentage;
  
                  } while (!(prcFFMPEG.HasExited || string.IsNullOrEmpty(strFFOUT)));
  
              }
  
              catch(Exception err)
  
              {
  
                  string errors = err.ToString();
  
              }
  
          }

  psiProcInfo is ProcessStartInfo

  prcFFMPEG is Process

  And this is how it looks like when i play the target the new created converted video file the mp4 the first seconds :

  Duration : 00:02:20

  Width : 1920 Height : 1080

  Data Rate and Total Rate both : 80kbps

  Frame rate : 2 frames/second

  

  This is the output of the ffmpeg console while converting the file.

    ffmpeg version 2.8.git Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 11.100 / 55. 11.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [avi @ 00000147a882b660] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, avi, from 'C:\temp\video\new.avi':
  
    Duration: 00:02:20.50, start: 0.000000, bitrate: 132710 kb/s
  
      Stream #0:0: Video: rawvideo, bgra, 1920x1080, 2 fps, 2 tbr, 2 tbn, 2 tbc
  
  Please use -profile:a or -profile:v, -profile is ambiguous
  
  Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (C:\temp\video\5.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  [libx264 @ 00000147a882c820] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 00000147a882c820] profile High, level 4.0
  
  [libx264 @ 00000147a882c820] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=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_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=2 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=18 ip_ratio=1.40 pb_ratio=1.30 aq=0
  
  Output #0, mp4, to 'C:\temp\video\5.mp4':
  
    Metadata:
  
      encoder         : Lavf57.20.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 2 fps, 16384 tbn, 2 tbc
  
      Metadata:
  
        encoder         : Lavc57.17.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=    8 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   15 fps= 14 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   21 fps= 13 q=18.0 size=      92kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   30 fps= 14 q=18.0 size=     141kB time=00:00:04.50 bitrate= 257.3kbits/s speed=2.03x    
  
  frame=   37 fps= 13 q=20.0 size=     164kB time=00:00:08.00 bitrate= 167.6kbits/s speed=2.82x    
  
  frame=   46 fps= 14 q=18.0 size=     185kB time=00:00:12.50 bitrate= 121.0kbits/s speed= 3.7x    
  
  frame=   51 fps= 13 q=19.0 size=     194kB time=00:00:15.00 bitrate= 106.1kbits/s speed=3.87x    
  
  frame=   58 fps= 13 q=18.0 size=     210kB time=00:00:18.50 bitrate=  93.2kbits/s speed=4.19x    
  
  frame=   65 fps= 13 q=20.0 size=     224kB time=00:00:22.00 bitrate=  83.6kbits/s speed=4.46x    
  
  frame=   71 fps= 13 q=19.0 size=     238kB time=00:00:25.00 bitrate=  78.1kbits/s speed=4.56x    
  
  frame=   78 fps= 13 q=18.0 size=     253kB time=00:00:28.50 bitrate=  72.6kbits/s speed=4.75x    
  
  frame=   83 fps= 13 q=19.0 size=     265kB time=00:00:31.00 bitrate=  70.0kbits/s speed= 4.7x    
  
  frame=   89 fps= 12 q=20.0 size=     280kB time=00:00:34.00 bitrate=  67.4kbits/s speed=4.73x    
  
  frame=   95 fps= 12 q=19.0 size=     291kB time=00:00:37.00 bitrate=  64.5kbits/s speed=4.73x    
  
  frame=  102 fps= 12 q=18.0 size=     308kB time=00:00:40.50 bitrate=  62.3kbits/s speed=4.84x    
  
  frame=  107 fps= 12 q=19.0 size=     317kB time=00:00:43.00 bitrate=  60.4kbits/s speed=4.82x    
  
  frame=  115 fps= 12 q=19.0 size=     336kB time=00:00:47.00 bitrate=  58.6kbits/s speed=4.96x    
  
  frame=  123 fps= 12 q=20.0 size=     354kB time=00:00:51.00 bitrate=  56.8kbits/s speed=5.09x    
  
  frame=  132 fps= 12 q=20.0 size=     371kB time=00:00:55.50 bitrate=  54.8kbits/s speed=5.25x    
  
  frame=  139 fps= 13 q=20.0 size=     392kB time=00:00:59.00 bitrate=  54.5kbits/s speed=5.32x    
  
  frame=  146 fps= 13 q=19.0 size=     408kB time=00:01:02.50 bitrate=  53.5kbits/s speed=5.37x    
  
  frame=  150 fps= 12 q=20.0 size=     417kB time=00:01:04.50 bitrate=  52.9kbits/s speed=5.28x    
  
  frame=  155 fps= 12 q=18.0 size=     428kB time=00:01:07.00 bitrate=  52.4kbits/s speed=5.25x    
  
  frame=  161 fps= 12 q=20.0 size=     441kB time=00:01:10.00 bitrate=  51.6kbits/s speed=5.26x    
  
  frame=  167 fps= 12 q=19.0 size=     462kB time=00:01:13.00 bitrate=  51.9kbits/s speed=5.29x    
  
  frame=  174 fps= 12 q=20.0 size=     483kB time=00:01:16.50 bitrate=  51.7kbits/s speed=5.33x    
  
  frame=  181 fps= 12 q=18.0 size=     614kB time=00:01:20.00 bitrate=  62.8kbits/s speed=5.36x    
  
  frame=  187 fps= 12 q=20.0 size=     763kB time=00:01:23.00 bitrate=  75.3kbits/s speed=5.35x    
  
  frame=  193 fps= 12 q=19.0 size=     852kB time=00:01:26.00 bitrate=  81.2kbits/s speed=5.36x    
  
  frame=  199 fps= 12 q=18.0 size=     865kB time=00:01:29.00 bitrate=  79.6kbits/s speed=5.37x    
  
  frame=  206 fps= 12 q=20.0 size=     932kB time=00:01:32.50 bitrate=  82.6kbits/s speed=5.39x    
  
  frame=  211 fps= 12 q=20.0 size=     943kB time=00:01:35.00 bitrate=  81.3kbits/s speed=5.38x    
  
  frame=  217 fps= 12 q=18.0 size=    1007kB time=00:01:38.00 bitrate=  84.1kbits/s speed=5.38x    
  
  frame=  223 fps= 12 q=20.0 size=    1175kB time=00:01:41.00 bitrate=  95.3kbits/s speed=5.38x    
  
  frame=  230 fps= 12 q=20.0 size=    1195kB time=00:01:44.50 bitrate=  93.7kbits/s speed=5.42x    
  
  frame=  235 fps= 12 q=18.0 size=    1205kB time=00:01:47.00 bitrate=  92.3kbits/s speed= 5.4x    
  
  frame=  241 fps= 12 q=20.0 size=    1222kB time=00:01:50.00 bitrate=  91.0kbits/s speed= 5.4x    
  
  frame=  247 fps= 12 q=19.0 size=    1232kB time=00:01:53.00 bitrate=  89.3kbits/s speed=5.39x    
  
  frame=  255 fps= 12 q=19.0 size=    1252kB time=00:01:57.00 bitrate=  87.7kbits/s speed=5.45x    
  
  frame=  260 fps= 12 q=20.0 size=    1274kB time=00:01:59.50 bitrate=  87.3kbits/s speed=5.44x    
  
  frame=  267 fps= 12 q=20.0 size=    1287kB time=00:02:03.00 bitrate=  85.7kbits/s speed=5.45x    
  
  frame=  272 fps= 12 q=18.0 size=    1304kB time=00:02:05.50 bitrate=  85.1kbits/s speed=5.43x    
  
  frame=  278 fps= 12 q=20.0 size=    1314kB time=00:02:08.50 bitrate=  83.8kbits/s speed=5.41x    
  
  frame=  281 fps= 12 q=-1.0 Lsize=    1376kB time=00:02:19.50 bitrate=  80.8kbits/s speed=5.76x    
  
  video:1372kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.299861%
  
  [libx264 @ 00000147a882c820] frame I:2     Avg QP:15.00  size: 98930
  
  [libx264 @ 00000147a882c820] frame P:80    Avg QP:18.00  size:  7068

• alac : Check that the channels fit at the given offset

  3 septembre 2013, par Martin Storsjö

  alac : Check that the channels fit at the given offset
  The code tries to decode a number of channels at the
  
  offset given by the ff_alac_channel_layout_offsets table.
  
  Even if the number of channels decoded so far doesn’t
  
  exceed the total number of channels, we need to check that
  
  we actually can decode that number of channels at this offset
  
  as well.
  Reported-by : Mateusz "j00ru" Jurczyk and Gynvael Coldwind
  
  CC : libav-stable@libav.org
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/alac.c

• alac : Check that the channels fit at the given offset

  3 septembre 2013, par Martin Storsjö

  alac : Check that the channels fit at the given offset
  The code tries to decode a number of channels at the
  
  offset given by the ff_alac_channel_layout_offsets table.
  
  Even if the number of channels decoded so far doesn’t
  
  exceed the total number of channels, we need to check that
  
  we actually can decode that number of channels at this offset
  
  as well.
  Reported-by : Mateusz "j00ru" Jurczyk and Gynvael Coldwind
  
  CC : libav-stable@libav.org
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/alac.c