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Autres articles (104)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
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  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
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Sur d’autres sites (6808)

  • Fix configure problem with out-of-source-tree build for fate-related .mak files in...

    26 juin 2011, par Paul Sterne

    Fix configure problem with out-of-source-tree build for fate-related .mak files in...

  • Revision 2fc927c66a : Fixing problem introduced in one of my previous commits. Changing fc->tx_probs

    20 juillet 2013, par Dmitry Kovalev

    Changed Paths :
     Modify /vp9/common/vp9_entropymode.c


     Modify /vp9/common/vp9_entropymode.h



    Fixing problem introduced in one of my previous commits.

    Changing fc->tx_probs back to fc->pre_tx_probs. This change actually
    affects the bitstream but current test vectors work. Chrome branch is not
    affected at all. Broken since :

    cc662dd Adding struct tx_probs and struct tx_counts to cleanup the code.

    Change-Id : I36dd4b3678e902e10aba8dd49b0012eb558c209d

  • Video streaming- control frame rate x264

    3 mars 2017, par H.A

    I’m new to video coding, I found this https://github.com/RafaelPalomar/H264LiveStreamer application code very useful to my project. I want to live stream a webcam over RTP . However, I’m having problem selecting the Frame Per Seconds (FPS). below is the function that controls the encoding param.

    void x264Encoder::initilize()
    
{
    
  x264_param_default_preset(&parameters, "veryfast", "zerolatency");
    
  parameters.i_log_level =  X264_LOG_DEBUG;
    
  parameters.i_threads = 1;
    
  parameters.i_width = 640;
    
  parameters.i_height = 480;
    
  parameters.i_fps_num = 25;
    
  parameters.i_fps_den = 1;
    
  parameters.i_keyint_max = 25;
    
  parameters.b_intra_refresh = 1;
    
  parameters.rc.i_rc_method = X264_RC_CRF;
    
  parameters.rc.i_vbv_buffer_size = 1000000;
    
  parameters.rc.i_vbv_max_bitrate = 90000;
    
  parameters.rc.f_rf_constant = 25;
    
  parameters.rc.f_rf_constant_max = 35;
    
  parameters.i_sps_id = 7;
    
  // the following two value you should keep 1
    
  parameters.b_repeat_headers = 1;    // to get header before every I-Frame
    
  parameters.b_annexb = 1; // put start code in front of nal. we will remove start code later
    
  x264_param_apply_profile(&parameters, "baseline");
    

    
  encoder = x264_encoder_open(&parameters);
    
  x264_picture_alloc(&picture_in, X264_CSP_I420, parameters.i_width, parameters.i_height);
    
  picture_in.i_type = X264_TYPE_AUTO;
    
  picture_in.img.i_csp = X264_CSP_I420;
    
  // i have initilized my color space converter for BGR24 to YUV420 because my opencv video capture gives BGR24 image. You can initilize according to your input pixelFormat
    
  convertContext = sws_getContext(parameters.i_width,parameters.i_height, PIX_FMT_BGR24, parameters.i_width,parameters.i_height,PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
    
}

    I’m using VLC as client whatever number i set i_fps_num to, I always get 12-14 FPS. fore example, in VLC Codec tab shows 25 FPS but in Stream statistics tab it shows it only display 13 FPS on average. here is the X264 encoder output

    x264 [debug]: frame=  72 QP=22.24 NAL=2 Slice:P Poc:144 I:97   P:116  SKIP:987  size=1464 bytes
    
x264 [info]: frame I:1     Avg QP:20.06  size: 17848
    
x264 [info]: frame P:72    Avg QP:22.12  size:  1337
    
x264 [info]: mb I  I16..4: 40.2%  0.0% 59.8%
    
x264 [info]: mb P  I16..4:  3.1%  0.0%  2.3%  P16..4:  8.3%  2.0%  0.6%  0.0%  0.0%    skip:83.7%
    
x264 [info]: coded y,uvDC,uvAC intra: 53.6% 46.4% 7.4% inter: 3.0% 1.6% 0.0%
    
x264 [info]: i16 v,h,dc,p: 11% 65% 12% 12%
    
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 46% 16%  3%  4%  3%  5%  3%  6%
    
x264 [info]: i8c dc,h,v,p: 46% 42% 10%  2%
    
x264 [info]: kb/s:312.60

    the last frame number that was encoded is 72 while in VLC stream statistics it shows that 133 frames are Displayed and 66 blocks are decoded for 10 seconds streaming in addition the video playback is bursty.

    my question is how to change the x264 parameters to get 25 FPS ?

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