properly handle planar data in avfoundation encoder #4454

Job	Run time
Typecheck	1m 20s
Detect Changes	6s
Format (Cargo)	18s
Build Desktop (aarch64-apple-darwin, macos-latest)	13m 49s
Format (Biome)	9s
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	16m 25s
Lint (Biome)	11s
Clippy	4m 8s
Verify Tauri plugin versions	0s
Rust cache	0s
	36m 26s

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