Migrate to FFmpeg new channel layout API #352

Job	Run time
rustfmt_check (macos-latest)	20s
build_static_and_test_ubuntu (release/6.0, nightly, no valgrind)	5m 53s
docs_rs_check	48s
rustfmt_check (windows-latest)	44s
build_dynamic_and_test_windows_pre	5m 38s
build_static_and_test_ubuntu (release/6.0, 1.70.0, no valgrind)	5m 26s
rustfmt_check (ubuntu-latest)	14s
build_static_and_test_ubuntu (release/6.1, nightly, valgrind)	32m 48s
rust_clippy_check_ubuntu	4m 57s
rust_clippy_check_windows	2m 31s
build_static_and_test_ubuntu (release/6.1, nightly, no valgrind)	5m 57s
build_static_and_test_ubuntu (release/6.1, 1.70.0, no valgrind)	5m 53s
build_dynamic_and_test_windows (nightly)	2m 26s
build_dynamic_and_test_windows (1.70.0)	2m 5s
	1h 15m 40s

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