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Autres articles (46)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • 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.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

Sur d’autres sites (6933)

  • How to write a video stream containing B-frame and no DTS to a MP4 container ?

    14 février 2020, par SteveH

    I want to save a h264 video stream received from a RTSP source to a MP4 container.
    Not like other questions asked on SO, here the challenges I face are :

    • The stream contains B frames.

    • The stream has only PTS given by the RTP/RTCP.

    Here is the code I did

    //  ffmpeg
    
    pkt->data = ..;
    
    pkt->size = ..;
    
    pkt->flags = bKeyFrame? AV_PKT_FLAG_KEY : 0;    
    
    pkt->dts = AV_NOPTS_VALUE;
    
    pkt->pts = PTS;
    

    
    // PTS is based on epoch microseconds so I ignored re-scaling.
    
    //av_packet_rescale_ts(pkt, { 1, AV_TIME_BASE }, muxTimebase);
    

    
    auto ret = av_interleaved_write_frame(m_pAVFormatCtx, pkt);

    I received a lot of error messages like this :
    "Application provided invalid, non monotonically increasing dts to muxer ...".

    Result : the mp4 file is playable via VLC but the FPS is just a half of the original FPS and the video duration is incorrect (VLC shows a weird number).

    So how do I set correct DTS and PTS before sending to the container ?

    Update :
    I have tried some changes, though not successfully yet, I found that the reason of the frame rate drop is due to the muxer discards frames having incorrect DTS.
    Additionally, if I set start of PTS and DTS value too big, some players like VLC has to delay some time before showing video.

  • WebM Video Codec in Skype 5.0 Group Video

    9 novembre 2010, par noreply@blogger.com (John Luther)

    Our friends at Skype recently released Skype 5.0 for Windows and Mac, which features a beta group video feature using VP8, the video codec in WebM. In the first half of 2010, approximately 40% of Skype-to-Skype calls were video calls and we’re excited that in the future many of those calls will be made using VP8.

    To check out the new group video feature, simply download the Skype Software.

    Note : For group video to work, everyone on the call needs the new Skype for Windows or Mac, a webcam and a broadband connection.

    For more info about Skype group video, visit the Skype website.

  • ffmpeg : `ffmpeg -i "/video.mp4" -i "/audio.m4a" -c copy -map 0:v:0 -map 1:a:0 -shortest "/nu.mp4"` truncates, how to loop audio to match videos ? [closed]

    18 avril 2024, par Swudu Susuwu

    This is with "FFmpeg Media Encoder" from Google Store (Linux-based Android OS), but it has all the commands of ffmpeg for normal Linux.

    


    -shortest truncates the video to match the audio, and -longest has the last half of the video not have audio (for videos twice as long as audio,)

    


    what to use to loop audio (to match length of video with this) ?

    


    Video length is 15:02, so used ffmpeg -i "/audio.m4a" -c copy -map 0:a:0 "/audionew.m4a"-t 15:02 -stream_loop -1`, but got errors.

    


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