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Autres articles (35)
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Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
Support audio et vidéo HTML5
10 avril 2011MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...) -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (2644)
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Why does every encoded frame's size increase after I had use to set one frame to be key in intel qsv of ffmpeg
22 avril 2021, par TONYI used intel's qsv to encode h264 video in ffmpeg. My av codec context settings is like as below :


m_ctx->width = m_width;
 m_ctx->height = m_height;
 m_ctx->time_base = { 1, (int)fps };
 m_ctx->qmin = 10;
 m_ctx->qmax = 35;
 m_ctx->gop_size = 3000;
 m_ctx->max_b_frames = 0;
 m_ctx->has_b_frames = false;
 m_ctx->refs = 2;
 m_ctx->slices = 0;
 m_ctx->codec_id = m_encoder->id;
 m_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
 m_ctx->pix_fmt = m_h264InputFormat;
 m_ctx->compression_level = 4;
 m_ctx->flags &= ~AV_CODEC_FLAG_CLOSED_GOP;
 AVDictionary *param = nullptr;
 av_dict_set(&param, "idr_interval", "0", 0);
 av_dict_set(&param, "async_depth", "1", 0);
 av_dict_set(&param, "forced_idr", "1", 0);



and in the encoding, I set the AVFrame to be AV_PICTURE_TYPE_I when key frame is needed :


if(key_frame){
 encodeFrame->pict_type = AV_PICTURE_TYPE_I;
 }else{
 encodeFrame->pict_type = AV_PICTURE_TYPE_NONE;
 }
 avcodec_send_frame(m_ctx, encodeFrame);
 avcodec_receive_packet(m_ctx, m_packet);
 std::cerr<<"packet size is "<size<<",is key frame "<code>


The strange phenomenon is that if I had set one frame to AV_PICTURE_TYPE_I, then every encoded frame's size after the key frame would increase. If I change the h264 encoder to x264, then it's ok.


The packet size is as below before I call "encodeFrame->pict_type = AV_PICTURE_TYPE_I" :


packet size is 26839
packet size is 2766
packet size is 2794
packet size is 2193
packet size is 1820
packet size is 2542
packet size is 2024
packet size is 1692
packet size is 2095
packet size is 2550
packet size is 1685
packet size is 1800
packet size is 2276
packet size is 1813
packet size is 2206
packet size is 2745
packet size is 2334
packet size is 2623
packet size is 2055



If I call "encodeFrame->pict_type = AV_PICTURE_TYPE_I", then the packet size is as below :


packet size is 23720,is key frame 1
packet size is 23771,is key frame 0
packet size is 23738,is key frame 0
packet size is 23752,is key frame 0
packet size is 23771,is key frame 0
packet size is 23763,is key frame 0
packet size is 23715,is key frame 0
packet size is 23686,is key frame 0
packet size is 23829,is key frame 0
packet size is 23774,is key frame 0
packet size is 23850,is key frame 0



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Revision 31020 : max = 255, ça bloquait la création de la table sur certaine base
20 août 2009, par vincent@… — Logmax = 255, ça bloquait la création de la table sur certaine base
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Revision 33445 : Deplacement de inc-theme-head à la suite de habillage.css et ...
1er décembre 2009, par shnoulle@… — LogDeplacement de inc-theme-head à la suite de habillage.css et impression.css pour surcharge