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  • Clip with Alpha

    Edius 4.24

    Here's a small experiment with Alpha and I don't understand the results:
    1. I put a PAL DV-clip alone on the timeline and apply a chromakey to it. (+ checked the clip to be sure that a great part of the clip is transparant)
    2. I export this clip as an uncompressed RGB clip. (export to HQ => same result)
    3. The info on the exported clip says clearly: alpha present.
    4. When using this exported clip over another clip the alpha parts are not transparant but black.

    What is going wrong?

    The strange thing is that a clip with apparently the same caracteristics: uncompressed RGB with Alpha created through other applications (e.g. Imaginate) do behave as expected.
    Edius 9.52 Pro & 8.53 WG - Win 10 64 - AMD-Ryzen 9 3900X - 32 Gb DDR4 - ASUS-PRIME X570-PRO - Nvidia GeForce RTX 2070 SUPER - SSD M.2 1000 Gb system + 3 x 3 Tb storage - 2 x 23" Full HD Monitors - M-Audio Studiophile AV40

  • #2
    nothing is wrong Bart, this is a limitation of Edius...You can find more info in other threads on this forum as well
    Aristotelis Bafaloukos
    Systems Engineer, Video Editor, 3D Artist
    BEng (Hons), MSc, MBCS

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    • #3
      I know that Edius has a limited Alpha support but what's the difference between 2 uncompressed RGB clips (same story for HQ clips) with an Alpha-channel.

      Is it the Edius exporter?
      Edius 9.52 Pro & 8.53 WG - Win 10 64 - AMD-Ryzen 9 3900X - 32 Gb DDR4 - ASUS-PRIME X570-PRO - Nvidia GeForce RTX 2070 SUPER - SSD M.2 1000 Gb system + 3 x 3 Tb storage - 2 x 23" Full HD Monitors - M-Audio Studiophile AV40

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      • #4
        It is the nature of EDIUS, that all timelines are "flattened" at file export - regardless of whether there are clips with alpha or not.

        This applies to sequences also.

        That said, there are a few tricks you can employ to create a clip with a proper alpha channel - it does require that you first render a masking video clip with the "show key" option enabled on the source that you are chroma keying.

        Ultimately, to create a clip with true alpha in EDIUS, you must use the 'Convert->File' option with the Bin Window's right-click context menu.

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        • #5
          Thank you, now it's clear.
          Edius 9.52 Pro & 8.53 WG - Win 10 64 - AMD-Ryzen 9 3900X - 32 Gb DDR4 - ASUS-PRIME X570-PRO - Nvidia GeForce RTX 2070 SUPER - SSD M.2 1000 Gb system + 3 x 3 Tb storage - 2 x 23" Full HD Monitors - M-Audio Studiophile AV40

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