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Old 27th November 2016, 18:09   #1  |  Link
konstantin1
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Is it possible to increase video gamma at container level without re-encoding?

I would like to know if is it possible to increase the brightness or gamma of a video without full re-encoding. For example some versions of ffmpeg allow certain special bitstream filters described here - presumed we have a h264 video - : http://forum.doom9.org/showthread.php?t=152419 which can alter some of the video characteristics without re-encoding the video. Some containers also can store such a meta information about the video gamma or brightness, as far as I know matroska, and QuickTime, and maybe there are some video players too which can deal with this information. I know that a similar modification, namely cropping the video is possible without a full re-encode merely by setting the cropping information at container level.

For example such a video uploaded to youtube are cropped at the values which were set at the container level. So this could be a quick fix for unneeded logos and black bars.
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Old 27th November 2016, 18:14   #2  |  Link
sneaker_ger
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Does this help?
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Old 27th November 2016, 19:10   #3  |  Link
konstantin1
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Yes, a bit. Which metadata should I set for increasing brightness or gamma? Maybe --white-colour-coordinates ?
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