empty_duration is in the mvhd's time base #1253

Job	Run time
Build Rust stable on ubuntu-20.04, release=true features=	46s
Build Rust stable on ubuntu-20.04, release=true features=missing-pixi-permitted	36s
Build Rust stable on ubuntu-20.04, release=false features=	44s
Build Rust stable on ubuntu-20.04, release=false features=missing-pixi-permitted	35s
Build Rust stable on windows-2019, release=true features=	2m 41s
Build Rust stable on windows-2019, release=true features=missing-pixi-permitted	2m 46s
Build Rust stable on windows-2019, release=false features=	2m 35s
Build Rust stable on windows-2019, release=false features=missing-pixi-permitted	3m 15s
Build Rust stable on macos-10.15, release=true features=	1s
Build Rust stable on macos-10.15, release=true features=missing-pixi-permitted	1s
Build Rust stable on macos-10.15, release=false features=	1s
Build Rust stable on macos-10.15, release=false features=missing-pixi-permitted	1s
Build Rust nightly on ubuntu-20.04, release=false features=	46s
Build Rust nightly on windows-2019, release=false features=	1m 29s
Build Rust nightly on macos-10.15, release=false features=	1s
	16m 18s

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