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Autres articles (44)
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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
Encodage et transformation en formats lisibles sur Internet
10 avril 2011MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...) -
Contribute to translation
13 avril 2011You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
MediaSPIP is currently available in French and English (...)
Sur d’autres sites (7932)
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Getting artifacts when trying to read video stream from YouTube
23 février 2012, par giviI'm trying to read the video frames from the RTSP stream that I get from YouTube. Here is the link for my test video :
rtsp ://v8.cache5.c.youtube.com/CiILENy73wIaGQkJlrXMiAG8BxMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp
If I'm reading frames from the local file - everything is fine, but when read them from a stream I get nothing but lots of artifacts. I've googled around and found out that there might be a problem with UDP packets and switching to TCP may help but I really can't find where it is possible to change this.
Here is the function for reading a frame :
bool nextFrame(AVFormatContext *pFormatCtx, AVCodecContext *pCodecCtx, int videoStream, AVFrame *pFrame) { AVPacket packet;
int frameFinished = 0;
while( !frameFinished && av_read_frame(pFormatCtx, &packet) >= 0 ) {
// Is this a packet from the video stream?
if( packet.stream_index == videoStream ) {
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
return frameFinished!=0;
}I'm also getting lots of error messages in my log :
[h263 @ 0x7804c00] warning: first frame is no keyframe
[h263 @ 0x7804c00] illegal ac vlc code at 6x1
[h263 @ 0x7804c00] Error at MB: 18
[h263 @ 0x7804c00] concealing 99 DC, 99 AC, 99 MV errors
[h263 @ 0x7804c00] I cbpy damaged at 10 4
[h263 @ 0x7804c00] Error at MB: 58
[h263 @ 0x7804c00] concealing 99 DC, 99 AC, 99 MV errors
[h263 @ 0x7804c00] I cbpy damaged at 6 6
[h263 @ 0x7804c00] Error at MB: 78
[h263 @ 0x7804c00] concealing 76 DC, 76 AC, 76 MV errors
[h263 @ 0x7804c00] I cbpy damaged at 5 5
[h263 @ 0x7804c00] Error at MB: 65
[h263 @ 0x7804c00] concealing 88 DC, 88 AC, 88 MV errors
[h263 @ 0x7804c00] illegal ac vlc code at 7x5
[h263 @ 0x7804c00] Error at MB: 67
[h263 @ 0x7804c00] concealing 86 DC, 86 AC, 86 MV errors...and so on
edit : this is 99.9% a UDP-TCP problem. I've found this link :
rtsp ://195.200.199.8/mpeg4/media.amp
This is some test camera available online. It streams with artifacts. However if it has get parameter 'tcp' and if I use this
rtsp ://195.200.199.8/mpeg4/media.amp ?tcp
everything works without artifacts.
So to correct my question : is there any way to force YouTube or ffmpeg to use TCP ?
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lavc : add video/audio/encoding flags to global_quality option
30 septembre 2011, par Anton Khirnovlavc : add video/audio/encoding flags to global_quality option
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ffmpeg unsupported video codec
11 mars 2012, par user413734I tried to convert a .flv into an mpeg with this code :
ffmpeg -i my.flv -target ntsc-dvd -aspect 4:3 my.mpg
And I get a lot of these here :
[flv @ 0x5597b8]Unsupported video codec (7)
and then :
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Unsupported codec (id=0) for input stream #0.0But when I ask ffmpeg for formats flv is supported.
What is wrong ?
Thanks !