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• Large Video file Conversion using ffmpeg

  12 mai 2021, par Varsha

  I am using ffmpeg tool to convert videos from wmv to mp4 formats using the following code -

  


          string outputPath = args[1].ToString();
        string[] files = Directory.GetFiles(inputPath);               
        Console.WriteLine(files.Length);
        foreach (var item in files)
        {
            itemBkp = item;                                       
            Process proc = new Process();
            proc.StartInfo.FileName = @"e:\test\ffmpeg.exe";                   
            string filename= Path.GetFileName(item);                    
            proc.StartInfo.Arguments=  " -i "  + item + " " + outputPath + filename.Split('.')[0] + ".mp4";
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardInput = true;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.Start();
            proc.WaitForExit();
        }


  


  It works fine for videos up to 20mb but when i try for videos above 70mb it throws following error -

  


  FFmpeg version SVN-r6179, Copyright (c) 2000-2004 Fabrice Bellard configuration : —extra-cflags=-I/static/include —extra-ldflags=-L/static/lib —enable-memalign-hack —enable-mp3lame —enable-xvid —enable-a52 —enable-libogg —enable-vorbis —enable-faac —enable-faad —enable-x264 —enable-pp —enable-amr_wb —enable-amr_nb —enable-avisynth —enable-gpl libavutil version : 49.0.0 libavcodec version : 51.13.0 libavformat version : 50.5.0 built on Sep 5 2006 22:41:30, gcc : 3.4.5 (mingw special) E :\videos\Playful : I/O error occured Usually that means that input file is truncated and/or corrupted.

  


  Is there a limit on video size to be converted ?

  


• Set RTSP/UDP buffer size in FFmpeg

  16 mars 2015, par chuckleplant

  Note : I’m aware ffmpeg and libav are different libraries. This is a problem common to both.

  Disclaimer : Duplicate of SO question marked as answered but actually didn’t give a proper solution.

  ---

  Insufficient UDP buffer size causes broken streams for several high resolution video streams. In LibAV/FFMPEG it’s possible to set the udp buffer size for udp urls (udp ://...) by appending some options to it.

  However, for RTSP urls this is not supported. These are the only solutions I’ve found :

  • Rebuilding ffmpeg/libav changing the UDP_MAX_PKT_SIZE in the udp.c source file.
  • Using a nasty hack to find the required value.
  • Using a different decoding library (proposed solution to aforementioned related SO question).

  None of these is actually a solution. From what I found it should be possible to use the API’s AVOptions to find and set this value. Or else, the AVDictionary.

  It’s very difficult to find how to set these throughout the documentation of either libav or ffmpeg.

• Building static FFmpeg libs for Windows 64-bit application

  6 avril 2016, par Igor R.

  I build static FFmpeg libs for Windows 64 bit. Configuring as follows :

  ./configure --disable-everything --enable-static --disable-shared --enable-memalign-hack --disable-debug --enable-stripping --enable-protocol=file --enable-yasm --enable-decoder=mp3,mpeg4,h264 --enable-muxer=mp4,avi --enable-encoder=mjpeg .

  The application is built in Visual Studio 2012 with /MT option and linked with libavformat.a, libavcodec.a etc. I also link it with libmingwex.a, libgcc.a.

  The linker fails with the following errors :

  6>libavformat.a(file.o) : error LNK2001: unresolved external symbol __imp__wrmdir
  
  6>libavformat.a(file.o) : error LNK2001: unresolved external symbol __imp__rmdir
  
  6>libavformat.a(file.o) : error LNK2001: unresolved external symbol __imp__wunlink
  
  6>libavformat.a(file.o) : error LNK2001: unresolved external symbol __imp__unlink
  
  6>libavutil.a(time.o) : error LNK2001: unresolved external symbol clock_gettime
  
  6>libavutil.a(time.o) : error LNK2001: unresolved external symbol nanosleep

  As for the 2 latter errors, I can solve them by manually defining macros in config.h : #define HAVE_NANOSLEEP 1 and #define HAVE_CLOCK_GETTIME 1.

  The question is how to solve the former 4. These look like functions imported from a dll (__imp prefix), but my application is built with /MT, and I don’t want any dynamic dependencies in FFmpeg. How to get rid of them ?

  I tried to configure FFmpeg with --extra-cflags="-static", but it doesn’t help.