Before you can build mpv & mpv.app on an Apple silicon Mac, there's a couple of required dependencies you'll need to install if you haven't already:
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Go to System Preferences > Software Update. If there's anything there to update, do it. 
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If you don't have the Xcode Command Line Tools installed, run xcode-select --installand select Install on the prompt that appears.
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If you don't have Homebrew installed, follow the instructions here. 
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If you don't have all of mpv's dependencies installed, run brew install --build-from-source --only-dependencies mpv && brew install libplacebo.
You'll also need a local copy of the mpv repo, which you can get by running git clone https://github.com/mpv-player/mpv.
You can now run the attached script to build mpv & mpv.app on an Apple silicon Mac yourself. Just make sure to run it from the root directory of the cloned repo.
If you want to bundle a static build of mpv.app, perform these steps following the ones above.
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Run brew install dylibbundler.
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Run the script from the root directory of the cloned repo, but append --staticto the command, like./build-mpv_silicon.sh --static.
Going forward, you can update your local copy of the repo by running the following commands from its root directory:
git reset --hard
git clean --force -d -x
git pull origin master
@miku1958 Yes, it's nice having gpu-next, now I can watch Dolby Vision videos with mpv!
But you don't have to install the whole Vulkan SDK, which is relatively large. You only need the MoltenVK runtime. As noted in the third comment above yours, it can be installed easily from Homebrew. Just do:
brew install molten-vkMaybe it can be added to the script...