Question Alpha transparency in video not working

I have a webm movie encoded with alpha transparency hosted on a server, it's available here:

https://media.equinox.vision/generic/alpha_vp8.webm

I've verified it contains transparency by loading that URL in Chrome, then adding "background: green" to the BODY element in Inspector, and it behaves as expected: everything outside the shape is green.

I'm loading this movie onto a gameObject with this code:

Code (CSharp):

1.  
2.                 var photoGo = _photoCanvas.gameObject;
3.                 var rendTex = new RenderTexture(1024, 1024, 16, RenderTextureFormat.ARGB32);
4.  
5.                 _videoPlayer = photoGo.AddComponent<VideoPlayer>();
6.                 _videoPlayer.renderMode = VideoRenderMode.RenderTexture;
7.                 _videoPlayer.targetTexture = rendTex;
8.                 _photoRawImage.texture = rendTex;
9.  
10.                 _videoPlayer.playOnAwake = false;
11.                 _videoPlayer.url = url;
12.                 _videoPlayer.isLooping = true;
13.                 _videoPlayer.waitForFirstFrame = false;
14.                 _videoPlayer.aspectRatio = VideoAspectRatio.FitInside;
15.                 _videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;
16.                 if (_videoPlayer.controlledAudioTrackCount > 0 ) {
17.                     _videoPlayer.SetTargetAudioSource(0, getAudioSource());
18.                 }
19.                 _videoPlayer.Play();
20.  

In the code, `_photoRawImage` contains a `RawImage` and a `Canvas`, nested under the `_photoCanvas` gameObject, which contains a `CanvasGroup` and a `Canvas` (used if there's no video).

However, I get the movie playing, but with a black colour where it should be transparent. So the video *is* playing, the content of the video is fine *except* it disregards the alpha channel. This is an AR app on Android, if it makes any difference.

Any ideas why the alpha channel isn't being used?

 

Hi,

I discovered a solution to this that doesn't require any additional scripts.

I am using a QT movie (Apple ProRes 4444) with transparency, transcoded in Unity.

It should work with both "Planes" or "Quads".

You need to create a new material set to the following :
Shader: Particles/Standard Unit
Rendering Mode: CutOut
Color Mode: Multiply

Add this to the plane/quad settings by dragging into the respective SETTINGS window - NOT onto the plane/quad in the Hierarchies window, which I found doesn't add the material in the expected fashion.

This then displays your video content with 100% transparency where intended.

Setting the Rendering Mode to "Transparent" (instead of "Cut Out") does not work as expected - the video will be 50% transparent in areas that are intended to be 100% transparent.

 

does this work on android?