Measured on the body node: the Microsoft H.264 decoder accepts MF_LOW_LATENCY and
CODECAPI_AVLowLatencyMode and ignores both; it holds pictures until the DPB it
derives from level_idc is full (six access units in, nothing out until DRAIN), and
appending access unit delimiters changes nothing. With level_idc rewritten to 1.0
in every SPS the DPB is one picture and each picture is emitted as the next access
unit arrives (5 of 6 while streaming, the last on flush). flush() now sends
COMMAND_DRAIN. The captured-stream test replays dumped access units and requires
the pictures while streaming; the keyframe-request check is its own test.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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