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• FFMpeg used in a C# MVC 3 app

  2 février 2012, par Chris

  I'm slowly going mad here and I'll apologise now as this question is going to be vague but I'm really struggling with getting video converting working reliably with FFMpeg. I've tried a few different wrappers but they all seem to go the same way.

  What I mean by that is unreliable converting (told you it would be vague), one time it will convert a video fine with no problems then the next it will just create a empty file. One solution I have tried is http://jasonjano.wordpress.com/2010/02/09/a-simple-c-wrapper-for-ffmpeg/ with unreliable results. I've currently even tried to get a trial version of a paid solution working (Media Handler by http://www.mediasoftpro.com/) with no joy either. I've worked on this for nearly the whole week and I've still go no closer to a reliable solution. Anyone with any help about anything really would be appreciated as I'm slowly going insane.

• How do I improve the quality of a video produced from still PNG images ?

  9 avril 2012, par cormullion

  I'm trying to create a video from a few hundred PNG images. The PNG images look OK to me, e.g. here are two in MacOS X Preview :

  

  They're about 1200 pixels square, 16 bit RGB, no transparency.

  But my attempt to make a few hundred of these into a video is encountering the following problem - nearly every frame has this yellow corruption (artefacts ?), that sort of blocky flickery stuff you see on poor quality videos :

  

  The ffmpeg command I'm using is something like this :

  ffmpeg -f image2 -i /tmp/image-%07d.png -vcodec mpeg4 -vb 20M -r 20 poincare.mov

  I've tried changing a few parameters, but I probably changed the wrong ones. Any idea which parameters I should be changing, and to what value ?

  Console output is :

   ffmpeg -f image2 -i /tmp/image-%07d.png -vcodec mpeg4 -vb 30M -r 30 poincare.mov
  
      FFmpeg version UNKNOWN, Copyright (c) 2000-2010 the FFmpeg developers
  
      built on Nov  9 2010 12:20:29 with gcc 4.2.1 (Apple Inc. build 5664)
  
      configuration: --prefix=/Users/worth/OtherApps/ffmpeg/ffmpeg/../local/x86_64 --enable-static --enable-shared --enable-gpl --enable-version3 --enable-libmp3lame --enable-pthreads --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libspeex --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-libvpx --enable-memalign-hack --disable-debug --disable-stripping --arch=x86_64
  
    libavutil     50.33. 0 / 50.33. 0
  
    libavcore      0.12. 0 /  0.12. 0
  
    libavcodec    52.94. 3 / 52.94. 3
  
    libavformat   52.84. 0 / 52.84. 0
  
    libavdevice   52. 2. 2 / 52. 2. 2
  
    libavfilter    1.59. 0 /  1.59. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
      Input #0, image2, from '/tmp/image-%07d.png':
  
    Duration: 00:08:55.44, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, rgb48be, 1200x1198, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  File 'poincare.mov' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x101301ae0] w:1200 h:1198 pixfmt:rgb48be
  
  [ffsink @ 0x101301d50] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x101302090] w:1200 h:1198 fmt:rgb48be -> w:1200 h:1198 fmt:yuv420p flags:0xa0000004
  
  Output #0, mov, to 'poincare.mov':
  
    Metadata:
  
      encoder         : Lavf52.84.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 1200x1198, q=2-31, 30000 kb/s, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  frame=13386 fps= 27 q=2.0 Lsize=  536132kB time=535.43 bitrate=8202.7kbits/s    
  
  video:535981kB audio:0kB global headers:0kB muxing overhead 0.028261%

• How to change frame rate of live stream using FFmpeg

  4 décembre 2012, par chiv

  I have created a streaming application, which takes video data from live source. Is there any transcoding tool which will receive stream from my streaming application and changes frame rate by transcoding the stream and re stream on another location ?

  currently I'm Struggling with FFmpeg code to use in Visual Studio 2010. And I wanted to integrate FFmpeg code in my application.

  Using FFmpeg.exe I'm able to transcode static files.I wont get any proper example how to transcode/change frame rate of live stream using FFmpeg. I tried,following command to re-stream on another IP.

        ffmpeg -re -i "rtp://my_ip:1234" -r 60 -f rtp "trp://my_ip:4321"