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  • 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.
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  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

Sur d’autres sites (11106)

  • FFmpeg on iPhone - Modifying Video Orientation

    6 avril 2015, par Matthew McGoogan

    I’m messing with h264 videos loaded with FFmpeg on the iPhone 3GS. The problem is any videos recorded in "Portrait" orientation have a transformation matrix applied to them causing them to display rotated 90 degrees counter-clock.

    From what I understand thus far, I just need to modify the transform matrix in the ’tkhd’ atom. The problem is I am having trouble accessing or modifying this data. I checked out the FFmpeg implementation for :

    static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)

    which clearly shows how the matrix is accessed in avformat but when I try to access the header bytes using the same functions I am not getting any rational values. Even if I were to successfully pull the matrix I’m not sure how to replace it ? FFmpeg has functions for retrieving and appending to the track header but nothing for replace it seems ?

    Any help would be greatly appreciated.

    Thanks,
    Matt.

  • Best way to load in a video and to grab images using c++

    17 octobre 2011, par Seb

    I am looking for a fast way to load in a video file and to create images from them at certain intervals ( every second, every minute, every hour, etc.).

    I tried using DirectShow, but it just ran too slow for me to start the video file and move to a certain location to get data and to save it out to an image. Even if I disabled the reference clock. Tried OpenCV, but it has trouble opening the AVI file unless I know the exact codec information. So if I know a way to get the codec information out from OpenCV I may give it another shot. I tried to use FFMPEG, but I don't have as much control over it as well as I would wish.

    Any advice would be greatly appreciated. This is being developed on a Windows box since it has to be hosted on a Windows box.

  • How do I use the Windows version of gstreamer and wireshark to take a .pcap file and extract H.264 from RTP ?

    5 mars 2015, par user1118047

    I have a pcap file containing a capture of RTP with H.264 video and SIP with SDP. I would like to be able to extract the video from the RTP stream and save it to a file. (h264video.mkv or something similar)

    I have started looking at gstreamer as a possible solution for this but I’m having trouble troubleshooting any of the output I receive from the program.

    gst-launch -v     filesrc location=testh264.rtp     
    
! application/x-rtp,media=video,clock-rate=90000,payload=123,encoding-name=H264     
    
! rtph264depay                   
    
! ffdec_h264                     
    
! xvimagesink

    Here is an example of something I’ve tried but I’m not able to get through rtph264depay because the file I’m sending is of invalid format. What can I do to extract the h264 payload from my pcap file for usage with gstreamer/rtph264depay ?

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