let vp8/vp9 support alpha?

1. offizieller Beitrag

    Make webm support alpha?

    When choosing vp8 or vp9 for video, choose vorbis for sound

    Output can choose webm.

    But the output webm file does not support transparency

    I checked the logs and found pixelFormat=yuv420p

    Can you add pixelFormat options of vp8 and vp9?

    I know it can be transparent if the pixelFormat is set to yuva420p

    I don't want export to ffv1 and manually convert it with ffmpeg.

    :(

  • Vouk 27. Oktober 2022 um 07:40

    Hat das Thema freigeschaltet.

  • Vouk 27. Oktober 2022 um 08:34

    Hat den Titel des Themas von „let webm support alpha?“ zu „let vp8/vp9 support alpha?“ geändert.

    Hello,

    I appreciate your great work, and would like to make an additional request here. Could you please make this VP8/VP9 alpha channel work in Davinci Resolve. Most people do not know how to render an alpha channel in Davinci, so here is how to do it.

    1) On the Edit page, place the clip that has the Alpha channel on Video Track 1. It MUST be on Video Track 1; it will not work on any other Video Track.

    2) On the Deliver page, set Render to "Individual clips". This is another MUST. If Render is set to "Single clip", Davinci will never render an Alpha Channel.

    3) Choose a Codec that supports Alpha Channel.

    A good one is Quicktime/Grass Valley/HQX.

    An "Export Alpha" check box will appear under the Resolution popup menu. Check it. Below that is the "Alpha Mode" where you can choose Premultiplied or Straight.

    Hope that helps you in figuring out how to hook in Voukoder.

    Thanks!

    Zitat von Vouk

    Added it for the next release.

    Note: with vp8 you have to set "Alternate reference frames" to "Disabled" to use it.

    I just can not find this Alternate reference frames option anywhere, would you please figure it out. Now vp8 with YUVA4:2:0 just crash my davinci resolve.