fix(codec): derive H.264 level from resolution when ffprobe reports 0 #6

Job	Run time
Build aarch64-unknown-linux-gnu	3m 1s
Build x86_64-unknown-linux-gnu	2m 45s
Build aarch64-apple-darwin	3m 7s
Build x86_64-pc-windows-msvc	6m 42s
Build x86_64-apple-darwin	3m 15s
Create Release	10s
	19m 0s

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