PulseAudio: adjust overall latency, not (only) the buffer size
Without this flag, PulseAudio will tweak the buffer parameters, but will not account for hardware latencies. As a consequence, the live caching parameter is not really followed - the latency is longer. Longer latency becomes a big problem when trying to synch with another live source (such as a V4L2 video capture device). Then audio is too late and gets discarded or messed up at output.
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