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• FFmpeg C# Video Conversion

  11 octobre 2017, par George Sillett

  On the click of a button I am trying to trim down an MP4 videos between two certain times with the use of FFmpeg C# Wrapper. My code is as follows :

  private void button1_Click(object sender, EventArgs e)
  
      {
  
          CAVConverter converter = new CAVConverter();
  
          converter.LogPath = @"C:\Users\Rachel\Desktop\Log.txt";           
  
          converter.InputOptions.TimeStart = 5000000; //Start time to trim, unit is um(micro second)
  
          converter.OutputOptions.TimeLength = 3000000; //Time length to trim, unit is um(micro second)
  
          converter.AddTask(@"C:\\Users\\Rachel\\Desktop\\Tennis\\Serve.mp4",
  
                                        @"C:\\Users\\Rachel\\Desktop\\Tennis\\ServeCut.mp4");            
  
          converter.StartAndWait();            
  
      }

  The code compiles and runs however the Log.txt file returns the following :

  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
   Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\\Users\\Rachel\\Desktop\\Tennis\\Serve.mp4':
     Metadata:
       major_brand     : isom
       minor_version   : 0
       compatible_brands: isom3gp4
     Duration: 00:00:38.76, start: 0.000000, bitrate: 10193 kb/s
       Stream #0.0(eng): Video: h264, yuv420p, 1280x720, 9982 kb/s, PAR 65536:65536 DAR 16:9, 30 fps, 90k tbr, 90k tbn, 180k tbc
       Stream #0.1(eng): Audio: libfaad, 48000 Hz, 2 channels, s16, 128 kb/s
   [mpeg4 @ 09762200]removing common factors from framerate
   [mpeg4 @ 09762200]timebase not supported by mpeg 4 standard
   Output #0, mp4, to 'C:\\Users\\Rachel\\Desktop\\Tennis\\ServeCut.mp4':
       Stream #0.0(eng): Video: mpeg4, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 90k tbc
       Stream #0.1(eng): Audio: libfaac, 48000 Hz, 2 channels, s16, 64 kb/s
   Stream mapping:
     Stream #0.0 -> #0.0 (Video)
     Stream #0.1 -> #0.1 (Audio)
   Error while opening encoder for output stream #0.0 (Video) - maybe incorrect parameters such as bit_rate, rate, width or height
   Error while opening encoder for output stream #0.0 (Video) - maybe incorrect parameters such as bit_rate, rate, width or height

  I don’t know much about FFmpeg or videos, so can anybody help me ?
  Many thanks

• FFmpeg C# Video Conversion

  28 septembre 2014, par George Sillett

  On the click of a button I am trying to trim down an MP4 videos between two certain times with the use of FFmpeg C# Wrapper. My code is as follows :

  private void button1_Click(object sender, EventArgs e)
  
      {
  
          CAVConverter converter = new CAVConverter();
  
          converter.LogPath = @"C:\Users\Rachel\Desktop\Log.txt";           
  
          converter.InputOptions.TimeStart = 5000000; //Start time to trim, unit is um(micro second)
  
          converter.OutputOptions.TimeLength = 3000000; //Time length to trim, unit is um(micro second)
  
          converter.AddTask(@"C:\\Users\\Rachel\\Desktop\\Tennis\\Serve.mp4",
  
                                        @"C:\\Users\\Rachel\\Desktop\\Tennis\\ServeCut.mp4");            
  
          converter.StartAndWait();            
  
      }

  The code compiles and runs however the Log.txt file returns the following :

  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
   Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\\Users\\Rachel\\Desktop\\Tennis\\Serve.mp4':
     Metadata:
       major_brand     : isom
       minor_version   : 0
       compatible_brands: isom3gp4
     Duration: 00:00:38.76, start: 0.000000, bitrate: 10193 kb/s
       Stream #0.0(eng): Video: h264, yuv420p, 1280x720, 9982 kb/s, PAR 65536:65536 DAR 16:9, 30 fps, 90k tbr, 90k tbn, 180k tbc
       Stream #0.1(eng): Audio: libfaad, 48000 Hz, 2 channels, s16, 128 kb/s
   [mpeg4 @ 09762200]removing common factors from framerate
   [mpeg4 @ 09762200]timebase not supported by mpeg 4 standard
   Output #0, mp4, to 'C:\\Users\\Rachel\\Desktop\\Tennis\\ServeCut.mp4':
       Stream #0.0(eng): Video: mpeg4, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 90k tbc
       Stream #0.1(eng): Audio: libfaac, 48000 Hz, 2 channels, s16, 64 kb/s
   Stream mapping:
     Stream #0.0 -> #0.0 (Video)
     Stream #0.1 -> #0.1 (Audio)
   Error while opening encoder for output stream #0.0 (Video) - maybe incorrect parameters such as bit_rate, rate, width or height
   Error while opening encoder for output stream #0.0 (Video) - maybe incorrect parameters such as bit_rate, rate, width or height

  I don’t know much about FFmpeg or videos, so can anybody help me ?
  Many thanks

• avfilter/vf_framerate : change blend factor precision

  15 janvier 2018, par Marton Balint

  avfilter/vf_framerate : change blend factor precision
  This is done mainly in preparation for the SIMD patches.
   for the 8-bit input, decrease the blend factor precision to 7-bit.
  
   for the 16-bit input, increase the blend factor precision to 15-bit.
  
   make sure the blend functions are not called with 0 or maximum blending
  
    factors, because we don't want the signed factor integers to overflow.
  Fate test changes are due to different rounding.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavfilter/vf_framerate.c
  • [DH] tests/ref/fate/filter-framerate-12bit-down
  • [DH] tests/ref/fate/filter-framerate-12bit-up
  • [DH] tests/ref/fate/filter-framerate-up