I have a Sony Bravia KD-55XD7005 which is an Android TV. On certain videos (I think 1080p MKV files) there is around a 1 second delay on the audio.
This only happens in Plex, if I open the same video using Plex UPNP in VLC media player the sync is perfect. If I optimise the video it works fine however this isnt practical for me. Iv tried adjusting the direct stream and direct play options but it was no different.
I have uninstalled the app and tried casting using google cast built in and the problem remained.
I am happy to try anything to get this fixed and feed back any info needed 