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• What is legacyNullReferencePolicy ?

  22 février 2014, par Sugrue

  We are getting mysterious SEHExceptions in our C# application which may be coming from some unmanaged code (FFMPEG). Its not being caught by the try-catch blocks - so we are not certain what is causing it, but it is perhaps due to a null reference.

  I found this on MSDN (SEHException MSDN Page) which says :

  The .NET Framework often encounters unmanaged SEH exceptions that are automatically mapped to managed equivalents. There are two common unmanaged SEH exceptions :
  STATUS_NO_MEMORY exceptions are automatically mapped to the OutOfMemoryException class.
  STATUS_ACCESS_VIOLATION exceptions are automatically mapped as follows :

  If legacyNullReferencePolicy is applied, all access violations are mapped to the NullReferenceException class.

  Now, this bit sounds interesting - if we could set this legacyNullReferencePolicy maybe these mysterious NullReferenceExceptions could be caught and we could find out where they are coming from.

  But I can't find any information online about legacyNullReferencePolicy. What is it ? Where do I set it ?

• ERROR : Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument

  13 octobre 2019, par timofischerprojects

  I want to replace the audio stream in a Video-DVD. But I have problems with the replace of the audio stream.

  The DVD-VOB have 3 streams.
  Stream 0 is dvd_nav_packet.
  Stream 1 is the video.
  Stream 2 is the audio.

  I also tryed to change the exportinformation for ffmepg with -map 0:d and -map 0:d:1. Also with and without from the codec Infos -f vob -target ntsc-dvd -vcodec copy -acodec copy. And update ffmpeag/use older versions. But I only get error messages.

  ffmpeg is startet with a vb.net Programm which which decide which video need a new audio file.

  Can somebody tell me what I do wrong ?

  ffmpeg.exe -i "F:\VIDEO_TS\VTS_01_1.VOB" -i "%CD%\tfpat.mp2" -map 0:0 -map 0:1 -map 1:0 -f vob -target ntsc-dvd -vcodec copy -acodec copy "C:\Users\Timo\AppData\Local\Microsoft\Windows\Burn\Burn\VIDEO_TS\VTS_01_1.VOB"
  
  
  
  
  
  ffmpeg version N-88514-gd5995c531d Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  1.100 / 58.  1.100
  
    libavformat    58.  0.102 / 58.  0.102
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  0.101 /  7.  0.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mpeg, from 'F:\VIDEO_TS\VTS_01_1.VOB':
  
    Duration: 00:01:51.17, start: 0.300300, bitrate: 7273 kb/s
  
      Stream #0:0[0x1bf]: Data: dvd_nav_packet
  
      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR 32:27 DAR 16:9], 6800 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
  
  [ac3 @ 037ee700] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, ac3, from 'D:\SkyDrive\Projekte\AtmosFX_Syncro_Projekt\AtmosFX-Translator\AlteVersionen\Version 2\tfpat.mp2':
  
    Duration: 00:01:51.26, start: 0.000000, bitrate: 320 kb/s
  
      Stream #1:0: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
  
  File 'C:\Users\Timo\AppData\Local\Microsoft\Windows\Burn\Burn\VIDEO_TS\VTS_01_1.VOB' already exists. Overwrite ? [y/N] y
  
  [dvd @ 037fbd20] Invalid media type data for output stream #0
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (copy)
  
      Last message repeated 1 times

• ffmpeg watermarking processing is very slow

  25 février 2014, par Hitesh Rohilla

  I am working on a video processing project and using ffmpeg for watermarking. I achieve exactly what i want but the problem is that the process is very very slow.

  I am using a Intel Smart 2nd gen family Core-i5 Processor with 4GB RAM on a 32 bit operating system Microsoft Windows-8 on a 64-bit CPU.

  I tried watermarking a video [mp4] of length 1:30 Min. size of file is 1.5GB

  Whole process accomplish in 3 Hrs to watermark my video file and what i noticed while process is that ffmpeg was processing 28 frames per sec first and then later it slow down up to 20 frames per second. a normal human watch video with frame rate of 30 frame per second and process was even slower then this that's why it took more time [3 Hrs] then the actual length of video itself [1:33]

  What i think to make process efficient is to use ffmpeg Watermarking Source Code and modify it somewhat...

  I want to ask if someone have achieve fast watermarking before by any other way or have modified this code to achieve faster process in order to save my time...