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Sur d’autres sites (13603)

  • 360 degree video of my OpenGL game

    23 août 2016, par woidler

    I want to make a 360 degree video of my OpenGL game.

    Concerning the rendering :
    Is it enough to render it in OpenGL with a specific projection matrix ?
    If yes, which one ?
    Or can I render it into a cube map, and then encode it ?
    (Which will require much more rendering power and be more complicated, which I want to avoid)

    And how do I encode a 360 degree video with FFMPEG ?

  • ffmpeg : use log10 instead of log()/log(10)

    29 octobre 2015, par Ganesh Ajjanagadde
    ffmpeg : use log10 instead of log()/log(10)

    This is more concise and conveys the intent better.
    
Furthermore, it is likely more precise as well due to lack of floating
    
point division.
    

    Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] ffmpeg.c

  • FFMPEG - Slowing to a Specific Duration

    3 janvier 2019, par Purple Prince

    I have an unusual problem when working with ffmpeg. I’m fixing up some .wav files which have very small errors in their duration, on the order of 0.001% of the total length of the recording.

    The suggested solution is to use the atempo filter to slow the audio, but this isn’t precise enough for my application (sound synchronisation with video) due to floating point imprecision. Is there a way to set the desired length of the output and have the input scale to that length ?

    For example if I set a desired length of 3 minutes with an input of 02:59.56 duration, can I get an output of exactly 3 minutes ? With the atempo filter I’m more likely to get 2:59.95 or similar, which doesn’t solve my issue.

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