Support only ffmpeg 6.0 and above #1232

Job	Run time
py-3.9 lib-6.1 ubuntu-latest	6m 10s
py-3.9 lib-6.0 ubuntu-latest	4m 13s
py-3.9 lib-6.1 windows-latest	3m 39s
package-source	22s
py-pypy3.9 lib-6.1 ubuntu-latest	5m 18s
py-3.9 lib-6.0 windows-latest	3m 19s
py-3.9 lib-6.1 macos-latest	5m 14s
style	20s
package-wheel (macos-latest, arm64)	11m 36s
package-wheel (macos-latest, x86_64)	35m 59s
package-wheel (ubuntu-latest, aarch64)	2h 36m 57s
package-wheel (ubuntu-latest, i686)	17m 2s
package-wheel (ubuntu-latest, x86_64)	16m 20s
package-wheel (windows-latest, AMD64)	13m 47s
publish	42s
	4h 40m 58s

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