tests

Add max_b_frames property to codec context #953

Job	Run time
package-source	30s
package-wheel (macos-latest, arm64)	20m 25s
py-3.8 lib-6.0 ubuntu-latest	5m 0s
package-wheel (macos-latest, x86_64)	34m 59s
style	14s
py-3.8 lib-5.1 ubuntu-latest	7m 12s
package-wheel (ubuntu-latest, aarch64)	6h 0m 14s
py-3.8 lib-6.0 windows-latest	3m 14s
py-3.8 lib-5.0 ubuntu-latest	6m 2s
package-wheel (ubuntu-latest, i686)	20m 57s
py-3.8 lib-5.1 windows-latest	3m 26s
py-pypy3.9 lib-5.0 ubuntu-latest	4m 26s
package-wheel (ubuntu-latest, x86_64)	38m 57s
py-3.8 lib-5.0 windows-latest	3m 16s
py-3.8 lib-5.0 macos-latest	6m 51s
package-wheel (windows-latest, AMD64)	24m 52s
publish	0s
	9h 0m 35s

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