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Autres articles (53)

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    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • MediaSPIP v0.2

    21 juin 2013, par

    MediaSPIP 0.2 est la première version de MediaSPIP stable.
    Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
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  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
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Sur d’autres sites (6081)

  • Getting artifacts when trying to read video stream from YouTube

    23 février 2012, par givi

    I'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 ?

  • http: Add the url_shutdown function for https, too

    1er juin 2012, par Martin Storsjö

    http: Add the url_shutdown function for https, too

  • http: Add the url_shutdown function for https, too

    1er juin 2012, par Martin Storsjö

    http: Add the url_shutdown function for https, too

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