ID 263507 - [FFmpeg] Mov64 reader / writer ycbcr matrix is not set correct

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Problem summary
Currently in Mov64 Reader/Writer the ycbcr matrix is selected based on a height assumption. If the height of a footage is > 720 (HD) then it is set to rec709, otherwise it will be set to rec601 which is associated with SD.

Customer reported version
Nuke 11.3v5

Customer reported platform
Windows 8

Steps to reproduce

1) Open Nuke.

2) Create a Write node.

3) Set the file type to 'mov' and the codec knob to a codec that is encoded with mov64 (ie. Apple ProRes 4444).

4) Notice that there is no option for ycbcr matrix.

5) Now set the codec knob to a codec that is encoded with mov32 (ie. H.264). Notice that there is an option for ycbcr matrix.

Expected behaviour
The user should be able to choose the ycbr matrix, similar to mov32.

Actual behaviour
With the mov64 Writer, there is no option for ycbcr matrix.

Reproduced by support
This bug has been reproduced in:
Nuke 12.0v2 - Windows 10 - CentOS 7 - macOS 10.13 (High Sierra)
Nuke 11.0v1 - Windows 10 
Nuke 10.0v1 - Windows 10
Nuke 9.0v1 - Windows 10

Earliest version tested
Nuke 9.0v1
- This issue appears to be in all versions of the product

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