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authorVito Caputo <vcaputo@pengaru.com>2020-07-14 15:46:16 -0700
committerVito Caputo <vcaputo@pengaru.com>2020-07-14 15:51:38 -0700
commitb75da7c41ea49c78ac9362f8837d4df9469613c6 (patch)
treef8ee4f7ad88a8dbd63868cb32734b0c2c6fdb4a8 /doc
parent48dae516a3fadc46eaf3228eb519728e2a3961e6 (diff)
timer: implement AV-sync
This is focused on keeping --on-the-fly-encoding in sync even over long videos. The existing code inevitably would fall into a permanently negative pdata->avd value letting things get increasingly out of sync and never correcting. Before removing the vestigial negative avd "don't wait" logic from get_frame when this permanently negative avd state was entered, get_frame would just start sampling at an unregulated fps. The timer thread which drives get_frame now consults avd on every tick, Depending on which which half is ahead, the timer will either cause get_frame to drop frames by advancing the frameno by more than one, or it will adjust its sleep delay in proportion to the delta. See comments in rmd_timer.c for more details. Note that in testing especially with a loaded system I observed some surprisingly large deltas where multi-second sleeps occurred to let the sound catch back up. I expect to revisit this issue more in the future, but would just like to get things more correct for now.
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