Function find_matching_media_capability 

fn find_matching_media_capability<'a>(
    format: &MediaFormat,
    capabilities: &'a MediaCapabilities,
) -> Option<&'a MediaCodecCapability>

Media capability matching ignores payload type. PT is negotiated output state, not an identity key for codec compatibility.

Compatibility is instead based on the codec’s media kind, codec name, clock rate, normalized channel count, and codec-specific critical fmtp parameters.