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  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

Sur d’autres sites (4458)

  • 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 ?

  • 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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