Originally Posted by Ken Ross
So add me to the list of those that need to reboot the Roku each time I start up the system. If I don't, it's the typical issues I've read about here, flashing, white flashing screen or purple screen of death. Cables are all certified and my Marantz receiver has no issues with any other 4K device.
The real frustration for me is that I have a perfectly acceptable workaround...almost. Rather than routing through my receiver, I can use a dedicated input on my LG G7 OLED. In this way I get no issues each time I turn on my system. Audio is via ARC and 'almost' everything is OK.
So what's my issue? Lip synch. Video is always slightly ahead of the audio, rendering any audio delay adjustments futile. I've already got audio delay and adjusting it further simply adds more delay. What I really need is video delay! Since I'm very sensitive to lip synch issues, this is unwatchable to me. It's actually preferable to reboot the damn Roku each time I turn on my system.
Does anyone know how to improve lip synch when the video is slightly ahead? Auto lip synch doesn't work with the Roku and every other device I have input into my Marantz has perfect lip synch. It's always the Roku that has the issues no other device has.
Originally Posted by jk246
I don't know what Marantz model you have, but I have a Denon AVR-X7200WA which shares very similar circuitry with the Marantz SR7011, and are almost identical in design except the Marantz was built in China and the Denon was built in Japan. Not surprising since both companies are parts of D&M Holdings. Even the manuals are almost the same. So, the only lipsync adjustment in the receivers can be found under the 'Settings' tab in the manual, under the heading, 'Audio Delay' [in my manual this is on page 198, I doubt it's the same in yours, but it should be close by if your receiver has this function]- (don't ask me any operational details, because I've never had to use it). It says the 'Audio Delay' settings are stored for each input source', but as for whether this will adjust in the right direction for you is something you'll have to find out yourself. Good luck, let me know how things turn out for you.
Originally Posted by Ken Ross
Thanks jk. Unfortunately the audio is delayed relative to the video already. So adding more audio delay simply exacerbates the problem. I do have the audio delay adjustment on my Marantz, but I need either a 'video delay' or an audio accelerator.
Originally Posted by nebo1ss
Most LIP SYNC issues are caused by the processing of these signals in either the AVR or TV. If you are using an AVR you are essentially stripping out the Audio and then passing the video to the TV. The AVR has no idea what delays are introduced in the TV processing.
However, most decent AVR's will allow you to manually introduce delay in the audio signal independently for each source.
1) Ken Ross has audio delayed with respect to the video.
2) Ken Ross's Marantz AVR, like "most decent AVR's" does allow manual introduction of delay in audio signal 0-200ms
3) Delaying an already delayed signal cannot resolve the issue.
nebo1ss, thank you for your post- it made me re-visit this issue and think about what's really going on.
Ken Ross, your Marantz AVR, being a D&M Holdings product, has very similar circuitry to my Denon. I went back and looked at the Denon circuitry and refreshed my recollection that there is Auto Lip-Sync built into these AVR's (very common). Apparently it's working for all HDMI inputs except one, right?
WRONG! It's working for all HDMI inputs. When I went back and re-read Ken Ross's original post about the delayed audio, I realized what's happening. Ken, by trying to correct a problem with one piece of equipment (the Roku), you're actually inducing another one. By feeding the Roku directly into one of the LG's HDMI inputs and then taking the LG's ARC out signal to feed the Marantz AVR, you're doing something neither was ever designed to do... The ARC out signal is in sync with video that is internally generated in the LG, like the ATSC tuner and the Web interface, but when you feed ARC out to the AVR, there is no reference video to re-sync to since your only feeding audio into a HDMI output of the AVR. The AVR then sends the audio through it's signal processing circuity which adds delay, and there you are- delayed audio. I'll bet that if you turn off your AAVRR and listen directly to the LG's internal speakers, that the audio and video are in sync.
Ken, it's a very clever idea of yours to try to resolve the problem with the Roko this way, but the LG (or any other TV for that matter) were never designed to work this way).
So, how to 'fix' this problem? It seems to be an incompatibility between the Roko and the AVR's HDMI connections. One thing to try (other than replacing the Roku, which seems to be a very problematic device in many ways) would be to introduce some other piece of equipment in between the Roku and the Marantz. The cheapest way I can think of off the top of my head is to put a 4k 1-input to 2-output active splitter (using only one output) in-between them and see if this mitigates their HDMI issues. If you have an active HDMI cable, you might try putting that in-between them instead, although I really don't think that would help, as I think this is a handshake issue, not a levels issue between the Roku and the Marantz. Possibly the best solution (after replacing the Roku) would be an EDID changer box (without actually using it to change the EDID) because this should fully buffer any handshaking between the Roku and the Marantz. Hope this helps, let me know how things work out.