https://bugs.kde.org/show_bug.cgi?id=386467
Bug ID: 386467
Summary: Expose auto-lip-sync value through kscreen-doctor
Product: KScreen
Version: git
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: wishlist
Priority: NOR
Component: common
Assignee: se...@kde.org
Reporter: kdeb...@fratti.ch
Target Milestone: ---
HDMI 1.3 has a standard optional way for display devices such as TVs to signal
back the input latency through EDID called "auto-lip-sync". This is intended
for A/V receivers that pass through the video to the TV but play back the audio
to adjust the audio playback delay to match the delay of the TV, as TVs tend to
have several frames of input latency.
Apparently HDMI 2.0 introduces an additional dynamic way to signal latency
which does not use EDID.
By exposing this in kscreen, applications could determine the approximate input
latency of the screen they're currently running on, and adjust their audio
delay accordingly if the audio isn't already being adjusted by the playback
setup. Other uses could include games asking the user to change their TV
setting if the reported latency is very high, or accurate syncing of external
ambient lighting to video playback.
This has very little real-world usability right this moment, but could come in
handy for multimedia people to tinker with.
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