Server Version#: 4.51.1 on QNap
Player Version#: Latest Roku, Latest Shield Version
For the last month or so I’ve had tons of audio sync issues. I was originally on a Shield TV, bought a Roku thinking this was the shield, still having sync issues with videos via Plex. The Shield’s audio sync feature with the bouncing ball is perfectly in sync and doesn’t see an issue. Sometimes the audio is REALLY out of sync by seconds other times its fractions of a second sometimes it’s not that bad, but it’s not consistent. The Roku doesn’t seem as bad as the Shield was but it’s certainly not perfect. A test file I downloaded and played through plex suggests I’ve got about 150ms of delay there.
I don’t want to have to stop using Plex but much of what I watch isn’t watchable right now.
Roku 9.4 has a bug when playing back MKV files with AC3/EAC3 - there’s an audio delay. If you turn off Direct Play in the Plex app on Roku that has been working as a workaround on the Roku until Roku gets around to fixing it (please report to Roku if you’re experience it - you can confirm using the Roku Media Player).
There was a bug with some other audio transcoding on Android\Cast and Roku but I think that was fixed up with recent server version updates.
Do you have media info for the files that are not in sync?
I’d definitely try unchecking the Direct Play option on the Roku as a workaround and see if that works since that’s the known bug. If you have Direct Stream still enabled you won’t see any quality issues - just a very light hit on your server while it splits the streams.
I’d go post it in the Shield specific support area (this one is flagged Android-mobile, Roku, server-qnap for example) to check it. You might also include the hardware you’re connected to as well because sometimes the passthrough issues come from TV or audio equipment.
For example, on Roku, the HDMI audio support defaults to “auto detect” but it doesn’t always identify the correct audio support and will default to “stereo” in that case; which can force transcoding and other hiccups. Sometimes that’s the fault of the TV or audio equipment support availability and having that specific information can help track down audio issues.
