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uyvy with alpha at half res?

June 21, 2013 | 7:17 am

just wondering: does anything as "uyvya" exist? like uyvy with an alpha channel at half the resolution? or maybe even something like uyvyaa with the alpha at full res?


June 21, 2013 | 11:35 am

no alpha with uyvy.
check out the hap-alpha option for the hap quicktime codec, and the external.

June 21, 2013 | 3:24 pm

thanks for your quick reply!
hap is cool but unfortunately no option in my case since i work with frame sequences saved as .jxf-files.

i did however fiddle around with this a little in the meantime and at least in my case this actually does help: i write my clips in an uyvya-fashion to disk (beforehand) and then unpack/pack them into uyvy + alpha when reading. the performance boost is not huge but quite noticable – i guess disk speed is the bottleneck in my setup.
with 720p video a single argb-jxf is 3,7 mb vs. 2,3 mb employing this approach. the fact that the alpha channel is only half the resolution is – at least in my setup – not noticable.

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