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• Revision 3d655805f2 : Use same intra prediction for all block size The commmit changed to use same in

  23 avril 2013, par Yaowu Xu

  Changed Paths :
   Modify /vp9/common/vp9_reconintra.c

  
   Modify /vp9/common/vp9_reconintra4x4.c

  
  
  Use same intra prediction for all block size

  The commmit changed to use same intra prediction function for all
  block sizes.

  Some details on the changes :
  1. All directional modes except DC/TM/V/H now have built-in filtering
  for all pixels with filter taps either (1, 2, 1)/4 or (1, 1)/2.
  2. Above edge get automatic extended to double width (bw*2), which
  makes a lot of the prediciton mode computation simpler.
  3. Same intra prediction function is called with different size
  for i4x4_pred and all other larger size.

  Overall, the change helped keyframe only coding for both cif size
  and std-hd size test sets by .5% consistently on all encodings.
  For normal coding with single/auto key frame, the change now also
  is consistently net positive for all encodings. The overall gains
  is about .15% on std-hd set.

  Change-Id : I01ceb31fbc73d49776262e6bdc06853b03bbd1d1

• convert 16bit grayscale raw video by ffmpeg for analysis in openCV

  15 février 2015, par user3730845

  I have 16bit grayscale stream of scientific data which I want to analyse in openCV. I tried to look for some conversion of data, however it seems that grayscale is a trouble for ffmpeg and available codecs.

  My idea is to use 3 colours of video wisely and stream my grayscales into 3 colours, one by one and then in openCV access each colour and do my analysis there. Is such a thing possible ?

  When I convert stream by : ffmpeg -f rawvideo -y -s 256x256 -pix_fmt gray16be -i rawfile.bin -an -vcodec ffv1 video.avi, I get weird colour space but I can open the result in openCV.

  If there is any other way to do such a thing can you point me towards libraries/howtos, ultimately I need to do thresholding, cross-correlation, edge filtering, centre of gravity types of functions and I need to do this as quickly as possible for datasets of >10GB

  My raw files/streams are set of 256x256 16bit b&w images, with 256 bytes header and gaps

• NodeMediaServer : RTMP Relay Push Not Accepting Commands

  13 avril 2021, par Devin Dixon

  I am using Node Media Server and I am trying to resize the RTMP push to resize to a smaller video. I have the following config :

  


  relay: {
    ffmpeg: '/usr/bin/ffmpeg',
    tasks: [
      {
        app: 'live',
        mode: 'push',
        vc: "libx264",
        vcParam: ['-filter_complex','"scale=\'if(gt(iw,1920),1920,-1)\':\'if(gt(ih,1080),1080,-1)\':force_original_aspect_ratio=decrease"', '-crf', 20],
        edge: 'rtmp://www.example.com',
      }
    ]
  }



  


  Except in my output, I am getting this :

  


  /usr/bin/ffmpeg -i rtmp://127.0.0.1:1935/live/123456 -c copy -f flv rtmp://www.examplee.com/live/123456

  


  Its using the copy and not passed commands. Any ideas on why its ignoring the config ?