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• ffmpeg concat batch loop with text file

  4 octobre 2013, par Lisa Jacobs

  I'm trying to batch a concat loop for a series of avi files where I need to add to each AVI a preroll and postroll movie.

  Here's what I've tried :

  _input.txt file :

  file '3D_preroll.avi'
  
  file '%%a'
  
  file '3D_postroll.avi'

  concat.bat file :

  for %%a in ("*.avi") do ffmpeg -f concat -i _input.txt -c:v libx264 -b:v 1700k -minrate 1500k -maxrate 1900k -bufsize 1900k -deinterlace -acodec libvo_aacenc -ac 2 -ar 48000 -ab 92k "%%a"_432p.mp4
  
  pause

  Unfortunately, I get the following error message before FFMPEG crashes :
  Impossible to open '%%a'

  What am I doing wrong ?

  Thank you :)

• How to encode a .wmv file that XNA DirectShow will play properly ?

  19 juin 2013, par Mr Pie

  I'm playing around with XNA DirectShow to stream a video from a file rather than loading it into my project (I'm fully aware of the XNA MediaPlayer class by the way). It plays the sample video it came with no problem. When I try to make my own .wmv from a series of PNG files I have using ffmpeg the video plays but is all blue (should be mostly yellow). Pixel format wrong ? Wrong codec ? I'm certainly no expert in these waters..

  The sample video is a VC-1 WMV3 apparantly, and I don't think I can replicate that ? What encoding/codec/fileformat should I be using ?

  Also ! If transparent video background is possible, that would be amazing. Is it ?

• How to wrap a C library parameter ?(Creating x264 .Net wrapper)

  6 décembre 2016, par Rella

  so in dll we have x264_param_t structure\object and a function for its setting up x264_param_apply_profile. in C we use such code to set it up

  x264_param_t param;
  
  x264_param_default_preset(&param, "veryfast", "zerolatency");
  
  param.i_threads = 1;
  
  param.i_width = width;
  
  param.i_height = height;
  
  param.i_fps_num = fps;
  
  param.i_fps_den = 1;
  
  // Intra refres:
  
  param.i_keyint_max = fps;
  
  param.b_intra_refresh = 1;
  
  //Rate control:
  
  param.rc.i_rc_method = X264_RC_CRF;
  
  param.rc.f_rf_constant = 25;
  
  param.rc.f_rf_constant_max = 35;
  
  //For streaming:
  
  param.b_repeat_headers = 1;
  
  param.b_annexb = 1;
  
  x264_param_apply_profile(&param, "baseline");

  I want to create wrapper for such.. thing. so I have libx264.dll and visual studio 2010 pro.

  How can I create .Net C# wrapper for it ?

  I am a beginner in P\Invoke stuff so I do not get a lot of it...

  what I want to achive is is frame by frame level of working with x264... By now I need only encoding parts... And all needed sample code for doing it in C is in How does one encode a series of images into H264 using the x264 C API ? . So I need to write a wrapper only for stuff mentioned there... So I am asking - how to create a wrapper on Parameter and on Function that sets up thap param. And I would love to see how to call that wrapper back from c#. So if you could provide any code in support I’d be glad to see it.