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Transparent video formats

Hi there,

We are currently using the WebM endpoint to generate transparent videos. However, not all browsers support WebM with an alpha channel (e.g. (Mobile) Safari). For this, we have to convert the video's to Quicktime / HEVC.

Is it possible for you to provide an endpoint to generate transparent videos in different formats, that are supported by the major browsers? E.g. WebM for chrome, HEVC for Safari, etc.

Or alternatively, provide a way to retrieve the raw frames (and maybe query by size)? Since converting from WebM to HEVC is not an easy task with tools like ffmpeg (need an intermediate format to retain the alpha channel).

If you have a good solution for directly converting WebM to Quicktime/HEVC using ffmpeg, please let me know.