Some TV SoCs (Amlogic Mi Box class) stall the MediaCodec output path
after pause/resume: audio and the clock keep advancing but the picture
freezes until a seek flushes the codec. Arm a watchdog on every
transition to playing with a warm decoder; if rendered frames stop
advancing while the position moves, recover with a 250ms seek-back
(same-position seeks are short-circuited without a codec flush),
capped per session and logged for field diagnosis.
close#1454
edde746
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