On Tue, Apr 21, 2015 at 05:25:37PM -0300, Pedro Arthur wrote:
> New patch with changes.
>
> 2015-04-21 13:14 GMT-03:00 Pedro Arthur :
>
> > I intended to fetch the correct gamma value from the video/image metada
> > or pass it by flag (like gamma=x) but yet I don't know how to get the
> > correct
I'll add that for some encodings filters with negative lobes will
cause ringing no matter the direction up/down, especially true for
higher dynamic range encodings like log and HDR options like SMPTE ST
2084
Kevin
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Thank you for the tips, I'll work on it.
2015-04-22 3:06 GMT-03:00 nand :
> > I intended to fetch the correct gamma value from the video/image metada
> > or pass it by flag (like gamma=x) but yet I don't know how to get the
> > correct gamma based on the input, thus for now it is hardcode.
>
> Th
> I intended to fetch the correct gamma value from the video/image metada
> or pass it by flag (like gamma=x) but yet I don't know how to get the
> correct gamma based on the input, thus for now it is hardcode.
This is how we do it in mpv:
1. If the source has enum AVColorTransferCharacteristic s
Le duodi 2 floréal, an CCXXIII, Pedro Arthur a écrit :
> #define SWS_SPLINE0x400
> +#define SWS_GAMMA_CORRECT 0x800
Sorry, I forgot one comment in my first email:
This has risks of conflicts if the avconv fork adds a different flag with
the same value. To avoid that, we usually leave a g
New patch with changes.
2015-04-21 13:14 GMT-03:00 Pedro Arthur :
> I intended to fetch the correct gamma value from the video/image metada
> or pass it by flag (like gamma=x) but yet I don't know how to get the
> correct gamma based on the input, thus for now it is hardcode.
>
> 2015-04-21 12:31
I intended to fetch the correct gamma value from the video/image metada
or pass it by flag (like gamma=x) but yet I don't know how to get the
correct gamma based on the input, thus for now it is hardcode.
2015-04-21 12:31 GMT-03:00 Kevin Wheatley :
> Pedro
>
> I understand the desire to 'degamma'
Pedro
I understand the desire to 'degamma' images prior to scaling, I'd be
interested in understanding how this could work with the colour_trc
options rather than only assuming a simple gamma.
Kevin
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On Tue, Apr 21, 2015 at 12:07:54PM -0300, Pedro Arthur wrote:
> Patch which adds support for gamma correct scaling in libswscale.
> options.c |3 ++
> swscale.c | 51 +++
> swscale.h |1
> swscale_internal.h |9 +-
> ut
Le duodi 2 floréal, an CCXXIII, Pedro Arthur a écrit :
> Subject: [FFmpeg-devel] [GSoC] Patch which adds support for gamma correct
"sws: add support for gamma-correct scaling"
> +{ "true","enable",0,
> AV_OPT_TYPE_CONST, { .i64 = 1
Patch which adds support for gamma correct scaling in libswscale.
From fe34ea493ffae9b6c1655112a66b5e0c4cfef26d Mon Sep 17 00:00:00 2001
From: Pedro Arthur
Date: Fri, 17 Apr 2015 17:08:42 -0300
Subject: [PATCH] Add gamma encodign/decoding before/after scaling in
libswscale
---
libswscale/option
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