empty_duration is in the mvhd's time base #1256

Job	Run time
Build Rust stable on ubuntu-20.04, release=true features=	1m 0s
Build Rust stable on ubuntu-20.04, release=true features=missing-pixi-permitted	3m 6s
Build Rust stable on ubuntu-20.04, release=false features=	2m 26s
Build Rust stable on ubuntu-20.04, release=false features=missing-pixi-permitted	2m 2s
Build Rust stable on windows-2019, release=true features=	5m 16s
Build Rust stable on windows-2019, release=true features=missing-pixi-permitted	5m 8s
Build Rust stable on windows-2019, release=false features=	4m 2s
Build Rust stable on windows-2019, release=false features=missing-pixi-permitted	4m 42s
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=	1m 39s
Build Rust nightly on windows-2019, release=false features=	34s
Build Rust nightly on macos-10.15, release=false features=	1s
	30m 0s

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