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Autres articles (78)
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Problèmes fréquents
10 mars 2010, parPHP et safe_mode activé
Une des principales sources de problèmes relève de la configuration de PHP et notamment de l’activation du safe_mode
La solution consiterait à soit désactiver le safe_mode soit placer le script dans un répertoire accessible par apache pour le site -
MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Personnaliser les catégories
21 juin 2013, parFormulaire de création d’une catégorie
Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire.
Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...)
Sur d’autres sites (12276)
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How to gain volumes of specific bands of audio files using ffmpeg ?
10 mai 2019, par Ko OhhashiI want increase or decrease volume of specific frequency bands with ffmpeg.
I think bandreject and bandpass filter can do similar thing.
But is there any way to reject 80% of energy of specific bands ?Thanks in advance ?
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using FFmpeg, how to decode H264 packets
28 mars 2017, par JunI’m new to FFmpeg struggling to decode H264 packets which can be obtained as an array of uint8_t.
After many of investigations, I think it should be able to just put the array into an AVPacket like the below
AVPacket *avpkt = (AVPacket *)malloc(sizeof(AVPacket) * 1);
av_init_packet(avpkt);
avpkt->data = ct; // ct is the array
avpkt->length =....and decode by avcodec_decode_video2(). A part of the code is like
...
codec = avcodec_find_decoder(CODEC_ID_H264);
gVideoCodecCtx = avcodec_alloc_context();
gFrame = avcodec_alloc_frame();
avcodec_decode_video2(gVideoCodecCtx, gFrame, &frameFinished, packet);
...I guess I set all required properties properly but this function is returning only -1 :(
I just found the -1 is coming from
ret = avctx->codec->decode(avctx, picture, got_picture_ptr, avpkt) ;
in the avcodec_decode_video2() ;
Actually, what I’m wondering is if I can decode H264 packets (without RTP header) by avcodec_decode_video2().
Thanks for the help in advance.
/////////// added
OK, I’m still trying to find a solution. What I’m doing now is the below
** the H264 stream in this RTP stream is encoded by FU-A
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receive a RTP packet
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look if the second byte of the RTP header is > 0 which means it’s the first packet (and possibly will be followed)
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see if the next RTP packet has > 0 at its second byte also, then it means the previous frame was a complete NAL or if this is < 0, the packet should be appended to the previous packet.
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remove all RTP header of the packets so it has only like FU indicator | FU header | NAL
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try play it with avcodec_decode_video2()
but it’s only returning -1..... am I supposed to remove FU indicator and header too ??
any suggestion will be very appreciated
thanks in advance.
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how to decode h264 data from rtsp stream directively to BGR24 pixel format for cv::Mat or cv::cuda::GpuMat with ffmpeg c lib on NVIDIA GPU ?
30 septembre 2019, par WussupI want decode h264 dirctively to cv::Mat or cv::cuda::GpuMat without sws_scale to saving CPUs.
So is there any way to make it realized ? thanks in advance.