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Forums VEGAS Pro Rendering with Alpha-Channel

  • Rendering with Alpha-Channel

     Graham Bernard updated 2 weeks ago 3 Members · 12 Posts
  • John Perez

    May 29, 2022 at 9:33 am

    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?

  • Graham Bernard

    May 29, 2022 at 3:33 pm

    I’ve not heard of an MP4 with an alpha component.

  • Graham Bernard

    May 29, 2022 at 3:57 pm

    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?

  • Ernest Rosado

    May 30, 2022 at 9:12 pm

    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.

  • Graham Bernard

    May 30, 2022 at 9:28 pm

    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?

  • Ernest Rosado

    May 31, 2022 at 2:24 pm

    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.

  • John Perez

    June 19, 2022 at 8:06 am

    PNG sequence? QT Animation. Are these rendering options in my V-19.

  • John Perez

    June 19, 2022 at 8:20 am

    You mean an PNG image sequence. Won’t that have a long render time and produce thousands of images?

  • Graham Bernard

    June 19, 2022 at 9:01 am

    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?

  • Graham Bernard

    June 20, 2022 at 7:30 am

    John Perez? Any news?

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