[FFmpeg-user] Normalize video on a section of the video

[Benjamin Hill]

I have a time-lapse of a beach scene.  The exposure wasn't locked.  So, I'd
like to keep the exposure as constant as possible, likely from using the
"normalize" filter. 

The problem is that it takes the entire frame into account - including the
palm tree that is waving in the wind and messing everything up.  Is there a
way to normalize on the upper-left quadrant of the scene (which is all blue
sky) and ignore the right side?  Maybe a way to temporarily mask out the
tree when picking normalization adjustments?
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Re: [FFmpeg-user] normalize

[Moritz Barsnick]

Hi Jacky,

On Mon, Mar 05, 2018 at 17:19:24 +0100, JACKY wrote:
> I would like to perform a aac sound normalize with the loudnorm filter
> but let ffmpeg read the first pass log result to perdorm the second pass
> is there a way to do so  on windows ?

As far as I can tell, there is no way (currently) for ffmpeg to re-use
the file from the first pass. You have to take the file's parameters
yourself in order to construct a filter command for the second pass:

http://k.ylo.ph/2016/04/04/loudnorm.html

Also see the quoted scripting example (this is in ruby, but could
easily be done in many scripting languages):
https://gist.github.com/kylophone/84ba07f6205895e65c9634a956bf6d54

Cheers,
Moritz
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[FFmpeg-user] normalize

[JACKY]

Hi every body

I would like to perform a aac sound normalize with the loudnorm filter
but let ffmpeg read the first pass log result to perdorm the second pass
is there a way to do so  on windows ?

regards
jacky

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