[FFmpeg-user] Setting colour range.

[Kieran O Leary]

On Tue, Nov 27, 2018 at 8:03 PM Dave Rice <dave at dericed.com> wrote:

>
> > On Nov 27, 2018, at 10:29 AM, Kieran O Leary <kieran.o.leary at gmail.com>
> wrote:
> >
> > On Tue, 27 Nov 2018, 15:21 Paul B Mahol <onemda at gmail.com <mailto:
> onemda at gmail.com> wrote:
> >
> >> On 11/27/18, Kieran O'Leary <kieran.oleary at irishfilm.ie> wrote:
> >>> When creating MOV files, setting the -color_range option does not seem
> to
> >>> have any effect. What am I doing wrong? Could it have anything to do
> with
> >>> the removal of the yuvj pixel formats?
> >>> Is setting this metadata even possible in the MOV container, or is it
> >>> something that is expected to be flagged at the stream level? I was
> >> having
> >>> difficulty finding info on where this info is even located in a file in
> >>> both:
> >>>
> https://developer.apple.com/library/archive/technotes/tn2162/_index.html
> >> and
> >>>
> >>
> https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFPreface/qtffPreface.html
> >>>
> >>> Worrying, if I set a value of jpeg, mpeg, or 0, ffprobe says that the
> >> file
> >>> has TV range.
> >>>
> >>> How to replicate:
> >>>
> >>> $ ./ffmpeg -f lavfi -i testsrc  -color_range jpeg -c:v prores -t 1
> >>> prores_jpeg.mov
> >>
> >> That encoder incorrectly never changes color range.
> >>
> >
> > Can this metadata ever be set at a container level for mov? Must it
> always
> > be the stream that holds this info?
>
> By default the colr atom is not written by ffmpeg, even when mandated
> (such as described in TN2162 for uncompressed in QuickTime). You can enable
> the colr atom while muxing by adding, -movflags write_colr. It’s been over
> 4 years since Vittorio added colr atom support, perhaps time to consider
> making it enabled by default.
> Dave Rice
>

I tried adding the -movflags +write_colr argument in my testing but it
didn't do anything. And it looks like the colr atom doesn't store a value
for colour range anyhow:
https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
But +1 to enabling by default.

-Kieran.