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I am trying to convert a MOV (with alpha channel) to WebM and Mp4 (with Alpha channel) using FFmpeg.
The WebM video is coming with the Alpha channel.
But the video is not supported in SAFARI Browser.

I found this website that has transparent videos in both formats (WebM & Mp4).
So it seems it is possible to have MOV and Mp4 with a transparent background.

How to convert MOV to Mp4 while preserving the alpha channel using FFmpeg?

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    Welcome on SuperUser. It seems that mp4 does not support alpha channel... Give it a look. BTW edit your post adding the command you used to convert from MOV I to WebM and that worked. It can be useful for others...
    – Hastur
    Commented Feb 12, 2021 at 11:57
  • VP9 can support alpha, and you can put that in MP4, but I'm not sure what's what you want or if your browser will support it. Anyway, I can't give you an answer you can blindly copy and paste without seeing info about your input as provided by ffmpeg -i input.mov.
    – llogan
    Commented Feb 12, 2021 at 21:46

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