[mediacapture-main] PowerNetworkFrequency constraint?

alvestrand has just created a new issue for 
https://github.com/w3c/mediacapture-main:

== PowerNetworkFrequency constraint? ==
Most cameras seem to have some place in their API where you set the 
line power frequency of the area you live in; this is used to suppress
 flicker from fluorescent or LED-based lighting fixtures.

Many times, the OS or the browser can make a guess at the right power 
frequency based on environment factors like timezone or location, and 
everything's OK.

But sometimes it's wrong. And it makes people unhappy.

One option is to have a way to override the setting from the 
application if needed; we can, for instance, have a tri-state 
constraint, mirroring the camera APIs:

powerNetworkFrequency = "50Hz", "60Hz", "default"

(I don't see a case for allowing "powerNetworkFrequency=200", which 
would be the case if we made it a number.... even though there are 
railway power grids at 16 2/3 Hz, they're rare enough that we should 
ignore them for simplicity's case).


See https://github.com/w3c/mediacapture-main/issues/234

Received on Tuesday, 25 August 2015 05:46:32 UTC