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  • 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 ?

  • Alternative to ffmpeg for dynamically creating video thumbnails

    3 novembre 2013, par user763852

    The server hosting my website doesn't have ffmpeg and I am not allowed to install any additional extensions. Is there any other way I can make video thumbnails dynamically ? Perhaps some kind of web service, where I pass the video file and as a result I get a picture file. I'm using php, by the way.

  • Revision 52725 : Petite erreur sur le bitrate video nominal

    6 octobre 2011, par kent1@… — Log

    Petite erreur sur le bitrate video nominal

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