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Premiere 2015.4 compositing problem

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Chris Paul
Premiere 2015.4 compositing problem
on Aug 4, 2016 at 10:18:07 pm

Just updated to 2015.4. The alpha channel in some quicktime movies is no longer interpreted correctly. These have premultiplied alpha but are being interpreted as straight. I am unable to change the interpretation through the usual dialog in Premiere- the option is there but is does not actually get applied to the clip. I had to re-render the clips in AfterEffects.

Chris Paul
POV


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Duke Sweden
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 2:40:09 am

How did you render the original misinterpreted clips? In AE?


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Duke Sweden
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 2:48:22 am

I'm rendering a green screen clip right now out of AE. I'll let you know the result. Normally I do it in Premiere Pro, but I just noticed how much smoother and faster Primatte Keyer works in AE. Compared to Premiere Pro it's like I'm on a workstation over here. On PPro it's so sluggish and aggravating.


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Duke Sweden
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 3:19:17 am

Just finished rendering (in AE, not AME) and dropped the clip in a Premiere Pro timeline and it looks great. Didn't have to change opacity to screen or multiply or anything. Again, keyed it in After Effects and sent composition to Render Queue. Rendered as AVI + Alpha.

If I remember correctly AME is incapable of rendering with an alpha channel.


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Tero Ahlfors
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 10:50:09 am

[Duke Sweden] "If I remember correctly AME is incapable of rendering with an alpha channel."

If you have a supported format with the correct settings you can render with alpha from AME.


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Duke Sweden
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 11:32:08 am

Sorry, Tero. I meant using Quicktime. I know you can encode with an alpha channel using .png for example.


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Tero Ahlfors
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 12:24:45 pm

There are Quicktime codecs that support alpha.


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Duke Sweden
Re: Premiere 2015.4 compositing problem
on Aug 5, 2016 at 1:32:43 pm

Back when I wanted to know if I could export video files with alpha in AME or PPro I was told that I could only do it using .png. But, anyway, here's a rather unsettling update. When I opened the project again this morning, my video clip with the alpha channel was no longer transparent. I tried deleting it and adding it to its own track again, but it shows a black background. As I mentioned last night, it looked perfect when I first added it to the timeline.

Then I noticed that I had proxies turned on. So evidently when doing green screen and using proxies, one must tread carefully.


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