Cross Dissolve + Compound clip + Transparency

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byte12

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Cross Dissolve + Compound clip + Transparency

PostThu May 13, 2021 6:26 pm

I was trying to animate a compound clip consisting of three transparent PNGs and noticed the transparency wasn't being applied correctly during the initial frames.

Video: https://i.imgur.com/Q05xzDL.mp4

Then I replaced the cross dissolve transitions with keyframe animations on the Opacity and everything was fine. Is this a bug in compound clip transitions or am I not understanding the intended behavior correctly?
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Jim Simon

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Re: Cross Dissolve + Compound clip + Transparency

PostFri May 14, 2021 3:17 pm

Man, that demo is tiny!
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byte12

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Re: Cross Dissolve + Compound clip + Transparency

PostSat May 15, 2021 8:24 pm

My apologies. It appears that Imgur reduced the bitrate/resolution pretty aggressively. Here's the same source video hosted elsewhere: https://drive.google.com/file/d/1bcTv1X ... sp=sharing Looks like the text rendering is still a little blurry but hopefully it helps.

Does that show you the details you need? The most important part is the black background briefly filling the compound clip around 0:19.
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Mike Warren

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Re: Cross Dissolve + Compound clip + Transparency

PostSat May 15, 2021 8:55 pm

There are problems with compound clips and embedded timelines with alpha.
What sometimes works is a very slight crop or scale of the clip with alpha.
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byte12

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Re: Cross Dissolve + Compound clip + Transparency

PostSun May 16, 2021 8:52 pm

Thanks, adding this to my trick bag. That would seem to indicate it's a bug, right?
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mabian

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Re: Cross Dissolve + Compound clip + Transparency

PostSun Oct 17, 2021 11:43 pm

Similar thing here, have a compound clip with text+ clips and cross-dissolve between some of them.

Where there's cross-dissolve the transparency isn't preserved and the cross-dissolve forces black background... if that's not a bug I don't know that it is...

Of course, decomposing the compound clip brings everything back to expected behavior... sigh...

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