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  • Emballe médias : à quoi cela sert ?

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    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
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  • Les sons

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Sur d’autres sites (6060)

  • Fetching movies' frames via ffmpeg and feed it to vlfeat's sift

    16 novembre 2012, par Karl

    I am going to develop a program that uses ffmpeg and vlfeat on a linux server.

    My task is simply : get some frames from a movie file and feed these frames to vlfeat's sift.

    I am reading through some documents regarding using ffmpeg in c development, mainly here and here. As stated in the site, "There is not much "web based" official documentation for using these libraries." And some tutorials there might be a little outdated. I also read around that the API might differ from version to version. So I would like to ask for the following :

    1. Is it safe to follow this tutorial for the current implementation ?

      • If so, given the impression from above, what are some of the things that should be change for the current implementation ? (currently I got ffmpeg-git-c995644)
      • If not, what are the functions to acquire the frames of the movie file in any format ?

    2. For vlfeat side, if I am to feed a movie's image frame from ffmpeg, what kind of conversion is required so that vlfeat's sift implementation can "digest" the movie's image frame ?

  • osgmovie example crashes when playing flv with alpha channel

    30 novembre 2013, par user1912093

    I m trying to play flv file with alpha channel

    osgmovie -e ffmpeg "The_wolf.flv"

    it shows message "transparent movie, enabling movie"

    then it freezes the osgmovie application without showing anything

    Can anybody tell me what is going wrong ?

    osgmovie behave like this for every flv file with alpha channel

    Thank you !

    Cheers,
    mossin

  • How can I optimize MP4 file encoding in openRTSP to the same level as FFmpeg ?

    2 juillet 2018, par Wolfgang Klenk

    I currently receive and store a RTSP stream from a camera with openRTSP with a command like this :

    openRTSP -4 "rtsp://192.168.41.185/rtsp_tunnel?h26x=4&line=1&inst=2" > movie.mp4

    I can do the same using FFmpeg :

    ffmpeg -i "rtsp://192.168.41.185/rtsp_tunnel?h26x=4&line=1&inst=2" -vcodec copy movie.mp4

    The video frames from the camera are 1280x720 (H.264) at around 30 fps and have a milliseconds timestamp stamped in. When I view the movie.mp4 created by ffmpeg it looks pretty nice, the seconds stamped into the video stream seem rather accurate. On the contrary, if I view the movie.mp4 created by openRTSP, the seconds in the video timestamp last definitively longer than the ones in reality. So one second on video could last two seconds in reality. I made several tests, and it is not an issue of network performance or of handling the messages received from the camera. The reason seems to be the part where the messages are encoded into this MP4 container.

    Is FFmpeg so much faster doing this than openRTSP ?

    Can I optimize the MP4 encoding in openRTSP somehow ?

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