The DTS parser emitted a core-only frame and discarded the trailing
DTS-HD extension substream whenever the extension straddled a PES
boundary (it advanced past only the core, then re-synced on the core
syncword, skipping the leftover extension bytes). That silently
downgrades DTS-HD MA / HRA to lossy DTS core.
Now: when an extension sync is visible after the core — full, or a
partial prefix at the buffer edge — wait for the full extension instead
of splitting it off; only 'nothing after the core' (final unit / EOF,
no parser flush) is taken as a genuine lossy core-only unit. Adds a
boundary-split regression test asserting core+extension is preserved.
MattJackson
fa4d7ef871