fix: eliminate overlay lag in vision mixer multiview#499
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With do_timestamp(true), the overlay appsrc stamped buffers with the current pipeline running time. The multiview compositor then held the buffer until all other pads caught up, delaying it by the full pipeline latency (~1s). PGM/PVW switches appeared instant in video but the border/label overlay lagged behind. Fix: disable auto-timestamping and set PTS=0 on every overlay buffer. PTS=0 is always in the past so the compositor renders it immediately. max-last-buffer-repeat (default infinite) keeps the frame visible until the next push replaces it. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
do_timestamp(true), stamping buffers with the current pipeline running timeTest plan
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