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Rendering with Alpha-Channel
updated 2 weeks ago
3 Members
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12 Posts
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I rendered a shot using Apple’s Pro Res codec, but the file was too big. Is it possible to render an alpha channel as an MP4?
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I’ve not heard of an MP4 with an alpha component.
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You want small? – I use QT Animation.
You want MP4 – no dice.
Why do you insist on MP4?
Have you thought of using rendering a PNG sequence?
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Depending on what the purpose of your video is, you can render an MP4 of your video and then render an additional MP4 with your alpha channel only. These two files often result in a smaller total size than rendering a pure video + alpha channel and get similar results, provided you’re sending this to an editor who will recombine the two into transparent video.
If this is a final clip for consumption, then WebM is probably the most efficient codec with an alpha channel to convert to, but I don’t think Vegas supports it natively.
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then render an additional MP4 with your alpha channel only.then render an additional MP4 with your alpha channel only.
Are you suggesting that an MP4 can provide an ALPHA channel?
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No. I’m suggesting the OP can render two mp4 files, one with the content, and the other one with an animated grayscale matte representing the alpha values in the first video.
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PNG sequence? QT Animation. Are these rendering options in my V-19.
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You mean an PNG image sequence. Won’t that have a long render time and produce thousands of images?
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Yes PNG Image sequence – correct.
Yes, these are rendering options in VP19 – correct.
QT is part of the “deprecated features” Tab and I have decided to have it available. I have QT7 installed, however, QT is no longer supported. Until I can obtain the ALPHA from MagicYUV working in VP19 I’ve got to be using the unsupported QT7 – it’s working.
Won’t that have a long render time and produce thousands of images?Won’t that have a long render time and produce thousands of images?
Depending on the length of the Event. I just did one and it was fast. You will get as many Images as there are Frames in your Event. You do the math, each Frame is a PNG.
Did you follow up on Ernest Rasado’s suggestion?
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John Perez? Any news?
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