[FFmpeg-user] Setting colour range.

[Gyan Doshi]

On 27-11-2018 09:17 PM, Gyan Doshi wrote:
> On 27-11-2018 08:59 PM, Kieran O Leary wrote:
> 
>>
>> Can this metadata ever be set at a container level for mov? Must it 
>> always
>> be the stream that holds this info?
> 
> The muxer only writes it for MP4s,
> 
> The QT spec doesn't accommodate its signaling :
> 

> https://developer.apple.com/library/archive/technotes/tn2162/_index.html#//apple_ref/doc/uid/DTS40013070-CH1-TNTAG7 

Correction. Meant to quote this,

     "The remaining component values (e.g., 1-15 and 241-254 for n=8 
bits and 4-63 and 961-1019 for n=10 bits) accommodate occasional filter 
undershoot and overshoot in image processing. In some applications, 
these values are used to carry other information (e.g., transparency). 
The writer of a QuickTime image may use these values and the reader of a 
QuickTime image must expect these values."

This implies that 'these values' is treated as 'other information' 
rather than range expansion.


Gyan