Migrate to FFmpeg new channel layout API #343

Job	Run time
docs_rs_check	1m 26s
build_dynamic_and_test_windows_pre	6m 33s
rust_clippy_check_ubuntu	5m 35s
build_static_and_test_ubuntu (release/4.3, nightly, no valgrind)	5m 25s
build_static_and_test_ubuntu (release/4.3, 1.70.0, no valgrind)	5m 8s
rust_clippy_check_windows	2m 15s
rustfmt_check (macos-latest)	21s
build_static_and_test_ubuntu (release/5.0, nightly, no valgrind)	5m 48s
rustfmt_check (windows-latest)	44s
build_static_and_test_ubuntu (release/5.0, 1.70.0, no valgrind)	5m 16s
rustfmt_check (ubuntu-latest)	14s
build_static_and_test_ubuntu (release/6.1, nightly, valgrind)	1h 3m 13s
build_static_and_test_ubuntu (release/6.1, nightly, no valgrind)	6m 38s
build_static_and_test_ubuntu (release/6.1, 1.70.0, no valgrind)	5m 42s
build_dynamic_and_test_windows (nightly)	2m 11s
build_dynamic_and_test_windows (1.70.0)	2m 9s
	1h 58m 38s

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