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Sur d’autres sites (3707)

  • Use lutyuv to calculate u component from y component

    20 août 2019, par user3931835

    In FFMpeg I use as filter

        lutyuv="y=0.000018712*val*val+0.0027334*val+1.3141:u=gammaval(1.09)"

    This works well. Now I want to calculate u value as a function of calculated y, something like u=1.1*previous_calculated_y*val. How can I access previously calculated y value in formula for u ? Or how can I access y information in formula for u ?

    Example : If y value was zero I would like to get for u = 1.3141*val.

    I googled and found nothing.

    lutyuv="y=0.000018712*val*val+0.0027334*val+1.3141:u=gammaval(1.09)"

  • avfilter/vf_vfrdet : fix reporting max delta

    29 octobre 2019, par Paul B Mahol
    avfilter/vf_vfrdet : fix reporting max delta

    If only first delta was big it was previously discarded.
    • [DH] libavfilter/vf_vfrdet.c

  • Fixing "RTP : dropping old packet received too late" in FFMPEG

    25 juin 2014, par user985030

    I have been using FFMPEG 0.6 for years with no problems and recently ported much of my code to 2.2 ; however, there is still a problem that I cannot resolve after fixing many of the deprecated functions. I am generating simulated video and then using RTSP to unicast this generated stream. The problem is that when I change the height and width of my video data, I basically recreate a new stream to send the subscribed client. The algorithm I used to do this in 0.6 worked like a charm, never had any problems. Now that I have upgraded, I get "RTP : dropping old packet received too late" as soon as I change my frame size. I think I have been dropping packets all along, but the new code is causing connection issues for me. The packets being dropped in the past were negligible and I really didn’t care if I missed them as long as the stream eventually corrected itself. Is there a flag that I can set to not drop these packets ? Or at least recover more quickly ? I believe that this has something to do with receiving packets out of order. There is a section of code that does a diff in FFMPEG in the rtpdec.c file in the function rtp_parts_one_packet. The only reference I found similar to my issue is here :

    http://en.it-usenet.org/thread/16949/6708/#post6707. Any tips would be greatly appreciated. In the meantime, I am just going to patch the FFMPEG code to not do the following check :

    if (diff < 0) {
    

    
/* Packet older than the previously emitted one, drop */
    

    
av_log(s->st ? s->st->codec : NULL,        AV_LOG_WARNING,
    

    
"RTP: dropping old packet received too late\n");
    

    
return -1;
    

    
}

    By commenting out the above code, I am able to run my streaming application like I used to, but I have a feeling that I am not doing something correctly but I am not sure what it is. Thanks for any advice !

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