I have actually researched this before resorting to the Massive but the answers are incomprehensible or not relevant to my set up.
The isituation:watching some, some but not all you tube or a streamed movie.
The problem the sound coming out of my hi fi speakers is slightly delayed to the visual.
The set up: a smart TV,an optical out that bypasses the TV speakers, feeding into optical in on my Marantz stereo amp.
Doesn’t seem to be so bad on all you tube but is a problem on a lot.
Some people say turn TV speakers down but these are bypassed in the settings.
Friends had a similar problem when trying to use TV as a slave screen to a laptop but I wouldn’t expect to have the same problem with a smart TV doing the streaming.
Thanks
Our Samsung has an adjustable delay on the SPIDF output. Adjustment is within the sound menu. I’ve never needed to use it but it’s set to the middle setting so presumably there’s some adjustment either way.
FWIW, I don’t think streamed content always stays in sync but if yours is fairly consistently out then it must be worth tinkering. I use our optical out from the tv to go through hifi speakers, also a Marantz. I would expect the screen scaling to be causing the picture delay. By using the TV optical, the Virgin TV box and Blu Ray player are both in sync with the screen. Presumably you’re streaming via the TV network cable rather than an external device such as Apple TV?
Ethernet. Cable to my modem for Internet. Then access Netflix or you tube on smart TV
It’s an Lg tv 1 year old.
If I don’t answer I’ve fallen asleep. It’s late here.
What this appears to be is a synchronisation issue. When using the TV speakers, the sound & vision should be in sync. In your setup, you have taken the audio out via optical digital into a separate device, consequently losing the synchronisation as the external device has to convert the digital signal to analogue, then route out to the speakers. On AV amplifiers there is a facility called ‘Lipsync’ which delays the audio by adjustable amounts until both elements are back in sync. You could check to see if this is available on your amp; alternatively check to see if there are any settings in the TV menu to see if it’s possible to adjust the sound and/or vision. It may not be so noticeable on YT as a lot of stuff I’ve watched on there is out of sync already for whatever reason, so your setup may be masking this.
Guessing a bit here, and building on garyt’s post, but which data stream clock is the amp taking? you want it to take the clock from the TV stream not its own clock which cound easily not be in step. Incomprehensible explained in wiki…
The receiver does not control the data rate, so it must avoid bit slip by synchronising its conversion with the source clock. This means that S/PDIF cannot fully decouple the final signal from influence by the analogue characteristics of the source or the interconnect, even though the digital audio data can normally be transmitted without loss. The source clock may carry inherent jitter or wander, and noise or distortion introduced in the data cable may further influence the process of clock recovery
Clocking is unlikely to be the issue here. Clock recovery problems would lead to data corruption. Data corruption means loud clicks or bangs.
SPDIF clock from a TV is typically 1.5MHz – less than a micro-second per cycle – and you’re not going to hear that.
If your amp is an audio amp, as opposed to a surround sound receiver, then I suspect you’re out of luck as the only place to adjust the delay would be the source ie the TV if it has the settings. I have a cheapish Samsung surround system that does allow adjustment of the delay although you can’t get to that menu on all the source inputs so you have to swap back and forth between sources and adjust it by trial error which is really annoying.
The others might be right though – it may be the source material that’s at fault as I wouldn’t really expect to get this sort of delay taking a digital audio signal straight from a TV to an amp.
@fentonsteve is really good on this stuff…..Steve?
It’s annoying, to be sure. I listen to music shows through the (Panasonic) TV optical out into a DAC, stereo amp and full-range hifi speakers. There’s a delay between TV speakers and hi-fi sound. The lipsync error isn’t enough to be annoying when I mute the speakers.
As mentioned above, there’s quite a bit of delay in upscaling TV pictures, or any sort of video processing. If the TV digital audio output is taken from the input to the video processor, the sound will arrive before the pictures. The internal TV speakers are run either from the output of the video processor, or from a delay-matched audio buffer.
I once designed a unit to fix lipsync for TV broadcasters. Yours for about £10k…
Geejus twang. Thanks for the effort but Ive only just woken up. Will need 2 strong coffees before I read that again.
It’s a pure bored stereo amps with a phono input but also coaxial and optical inputs.
Err bred not bored though it may be bored with what I play through it.
Follow up – where do sound bars get their sound from ?
If they’re anything like the Bose Solo I’ve just bought to go under my Sony TV, optical – if that’s what you mean.
Some have HDMI inputs. Solo is highly recommended, btw – a zillion times better than the tv, not particularly demonstrative but rich and full. We were at last able to understand the dialogue in Broadchurch – the acid test. TV sits on top of it, so nothing to get in the way of the remote, and no subwoofer to clutter the place up.
As you were.