[FFmpeg-devel] [PATCH 2/2] lavf/avienc: New AVOption write_keyframe_palette

Mats Peterson matsp888 at yahoo.com
Tue Mar 8 13:34:27 CET 2016

On 03/08/2016 11:47 AM, Mats Peterson wrote:
> Here's a somewhat experimental patch with a new AVOption
> write_keyframe_palette that allows you to write the palette to every
> keyframe. It is disabled by default, but it is needed for any file that
> contains palette changes in order to switch palette properly in FFplay
> (and, in the future, probably MPlayer, unless it manages to solve it in
> a different way).
> It's interesting to note that Windows Media Player doesn't need xxpc
> chunks at keyframes in order to seek properly in the original file
> TOON.AVI below from Sierra's King's Quest VI. I have of course no idea
> how they solve that.

In this context, it would be interesting to know whether there's some 
way to detect the strh flag AVISF_VIDEO_PALCHANGES in the demuxer, and 
transfer the state to the muxer? Is there any type of global area in 
FFmpeg where this state could be recorded?


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