tests

Improve stubs in av.video #1141

Job	Run time
package-source	20s
style	17s
py-3.8 lib-6.1 ubuntu-latest	5m 8s
package-wheel (macos-latest, arm64)	14m 11s
py-3.8 lib-6.0 ubuntu-latest	4m 3s
py-3.8 lib-6.1 windows-latest	3m 55s
package-wheel (macos-latest, x86_64)	22m 27s
py-3.8 lib-5.1 ubuntu-latest	4m 5s
py-3.8 lib-6.0 windows-latest	3m 54s
package-wheel (ubuntu-latest, aarch64)	25m 24s
py-3.8 lib-5.0 ubuntu-latest	4m 12s
py-3.8 lib-5.1 windows-latest	3m 15s
package-wheel (ubuntu-latest, i686)	22m 33s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 20s
package-wheel (ubuntu-latest, x86_64)	21m 3s
py-3.8 lib-5.0 windows-latest	3m 42s
package-wheel (windows-latest, AMD64)	16m 9s
py-3.8 lib-6.1 macos-latest	9m 59s
publish	1s
	2h 48m 58s

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