Re: [FFmpeg-devel] [PATCH 1/3] avformat/dvdvideodec: add CLUT utilities and subtitle palette support

From: Anton Khirnov <anton@khirnov.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 1/3] avformat/dvdvideodec: add CLUT utilities and subtitle palette support
Date: Thu, 07 Mar 2024 10:53:46 +0100
Message-ID: <170980522693.7287.8599203354160787584@lain.khirnov.net> (raw)
In-Reply-To: <CA+28BfCiTk+TSmVy7nfujuRQ3o8C_rUBy7TLw93oLS=BEj-kmw@mail.gmail.com>

Quoting Marth64 (2024-03-06 16:36:32)
> Good morning,
> 
> DVD subtitle palettes, which are natively YUV, are currently carried as
> a hex string in their respective subtitle streams and have
> no concept of colorspace tagging (even predating dvd demuxer). The
> convention is to convert
> them to RGB prior to storage. Common players will only render
> the palettes properly if they are stored as RGB. Even ffmpeg itself
> expects this, and already does -in libavformat- the YUV-RGB conversions,
> specifically in mov.c and movenc.c.
> 
> The point of this patch is to provide a consolidation of the code
> that deals with creating the extradata as well as the RGB conversion.
> That can then (1) enable usable palette support for DVD demuxer if it is
> merged
> and (2) start the process of consolidating the related conversions in
> MOV muxer/demuxer and eventually find a way to properly tag
> the colorspace.

Is there any reason ever to export YUV palette? Should this even be an
option?

-- 
Anton Khirnov
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