Audio Passthrough on 2.18.0 played EAC3 silently on a Shield in front of
a Dolby-Digital-only receiver: mpv's IEC 61937 AudioTrack bypasses the
platform's Dolby transcoder, so the pre-packed DD+ bitstream reached a
sink that cannot decode it, drained at full rate, and no failure was
observable app-side. Disabling passthrough lost surround instead, because
multichannel PCM collapses to stereo in the platform mixer before the
HDMI re-encode.
libmpv v1.2.0 unwraps the IEC bursts and feeds AC3, E-AC3 and the DTS
core to a raw ENCODING_AC3/E_AC3/DTS track - the transport ExoPlayer and
Kodi use - keeping the platform decoder/transcoder in the path, with the
IEC track as fallback and audiotrack-raw-passthrough=no as an escape
hatch. TrueHD and DTS-HD MA stay on the 8-channel IEC carrier.
The audio-spdif route probe now accepts a codec when the route takes its
raw track (the same direct-playback tiering media3 uses; encoding-only
below API 29) or one of the IEC shapes, matching the AO's transport
ladder. A dev-only PLEZY_LOCAL_MPV_AAR override allows testing locally
built fork AARs before a release is pinned.
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