Hi James,

> On Jul 16, 2019, at 9:47 AM, James Almer <jamr...@gmail.com> wrote:
> 
> -    { "write_colr", "Write colr atom (Experimental, may be renamed or 
> changed, do not use from scripts)", 0, AV_OPT_TYPE_CONST, {.i64 = 
> FF_MOV_FLAG_WRITE_COLR}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, 
> "movflags" },

The comment said specifically not to use this option in scripts; however, there 
were ffmpeg users (I admit myself as one) who wanted both to use scripts and 
write valid QuickTime files with colr data. I’d suggest permitting the option 
to remain but to change the default behavior from disabled to enabled. If I 
understand correctly, after this patch, encoding with `-movflags write_colr` 
would cause ffmpeg to fail with an error from the mov muxer.

Dave

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