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  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
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Sur d’autres sites (9768)

  • checkasm : vp8.mc : initialize the full src buffer after ec32574209f

    12 juillet 2016, par Janne Grunau
    checkasm : vp8.mc : initialize the full src buffer after ec32574209f

    Fixes "Use of uninitialised value" valgrind warnings in checkasm.
    • [DBH] tests/checkasm/vp8dsp.c

  • Calculate edits in QuickTime Movie File with Edit List Atom

    8 juin 2016, par kodonnell

    In a Linux environment, is there a way to calculate any edits in a QuickTime Movie File track ? Specifically, I need duration and start time of edits in relation to the movie.

    I have been parsing the raw mov file to look at the Edit List Atom ( i.e. ’elst’ ) to get the track duration and media time but, even after the adjustments for time scale units the start time always seems off.

    For example, I have a single track video which has been edited to have first and last 6 seconds of the video removed. However, when I look at the ’elst’ atom of that file the track duration is the length of the new file but, the media time does not match what I would have expected (i.e. something equivalent to 6 seconds).

    I have tried looking into tools like FFmpeg but have had little success.

  • Envelope pattern in SoX (Sound eXchange) or ffmpeg

    26 mai 2016, par pJay

    I’ve been using SoX to generate white noise. I’m after a way of modulating the volume across the entire track in a way that will create a pattern similar to this :

    White noise envelope effect

    I’ve experimented with fade, but that fades in to 100% volume and fades out to 0% volume, which is just a pain in this instance.

    The tremolo effect isn’t quite what I’m after either, as the frequency of the pattern will be changing over time.

    The only other alternative is to split the white noise file into separate files, apply fade and then apply trim to either end so it doesn’t fade all the way, but this seems like a lot of unnecessary processing.

    I’ve been checking out this example Using SoX to change the volume level of a range of time in an audio file, but I don’t think it’s quite what I’m after.

    I’m using the command-line in Ubuntu with SoX, but I’m open to suggestions with ffmpeg, or any other Linux based command-line solution.

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