Could just be some equipment related thing but supposedly the threshold of when you notice the out of sync video/audio varies from person to person. I also remember reading somewhere (but was it true…) that you can also learn (not sure if you can actually try to notice it on purpose or if it just sometimes happens and then you can’t unlearn it) to notice even smaller and smaller differences. 225ms is quite a lot though I think.
So if it is actually out of sync but you don’t notice, then don’t try to notice it. 
Although if the following is true…
http://www.lipfix.com/file/doc/stanfordresearch.pdf
_Summary of Results: _
_1. When audio precedes video by 5 video fields, viewers evaluate people on television _
_more negatively (e.g. less interesting, more unpleasant, less influential, more agitated, _
**less successful). This difference is not large, but it is statistically significant. **
…
_Awareness of audio-video asynchrony is not necessary for synchronization problems _
_to have psychological effect. _
_Half of the subjects could identify the synch problems and half could not, yet both _
_groups were affected by the problem. _