Backport of !4210 (merged) "tsdemux: Fix reading of extended Opus channel configuration".
Commits:
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3851c2da tsdemux: Fix reading of extended Opus channel configuration
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ccad9a73 plugins: Fix various trivial clang compiler warnings
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7e2a0779 flacenc: Fix mapping of GStreamer image tag type to FLAC image tag type
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621ec7b6 matroskademux: Make gst_byte_reader_get_data() usage less confusing
