[VideoStream] resource for WebM videos. [VideoStream] resource handling the [url=https://www.webmproject.org/]WebM[/url] video format with [code].webm[/code] extension. Both the VP8 and VP9 codecs are supported. The VP8 and VP9 codecs are more efficient than [VideoStreamTheora], but they require more CPU resources to decode (especially VP9). Both the VP8 and VP9 codecs are decoded on the CPU. [b]Note:[/b] Alpha channel (also known as transparency) is not supported. The video will always appear to have a black background, even if it originally contains an alpha channel. [b]Note:[/b] Not supported on iOS, or when compiled for RISC-V, and there are known bugs and performance issues with WebM video playback in Godot. If you run into problems, try using the Ogg Theora format instead: [VideoStreamTheora] Returns the WebM video file handled by this [VideoStreamWebm]. Sets the WebM video file that this [VideoStreamWebm] resource handles. The [code]file[/code] name should have the [code].webm[/code] extension.