Exporting ProRes4444 with RGB and Alpha channel?

hi,

 

i wouldn't bother going 4444, it's prores flavour allows embedded alpha channel.

 

so render out 'rgb & alpha' selected, video black background - presumably background set in comp.

 

what doing wrong? 

set project color depth 16 bit set alpha chanel prorez 444 in output module this:

 

it's common mistake miss these settings. rendered qt have alpha workes nle or compositing system when view movie in quicktime player background black. have use workflow if want video play on web page transparent background.

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