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Roku Question
This thread has 21 replies. Displaying posts 16 through 22.
OP | Post 16 made on Tuesday March 21, 2017 at 16:29
Gman
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On March 21, 2017 at 16:23, Fins said...
That model isn't available any more.

This one will do hdmi and a/v out at the same time, and I've not had any delay problems.

[Link: roku.com]

Is the USB port for storage or could one play files from a USB stick?
Post 17 made on Tuesday March 21, 2017 at 16:49
Fins
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On March 21, 2017 at 16:29, Gman said...
Is the USB port for storage or could one play files from a USB stick?

It's power. But roku does have the ability using different channels to stream from a network drive. Pop the USB stick on a computer and you should be able to find it on the net
Civil War reenactment is LARPing for people with no imagination.

Post 18 made on Tuesday March 21, 2017 at 16:50
BobL
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In most situations the audio needs to be delayed because the video processing takes longer than the audio processing. Most receivers have a delay setting for this situation, in fact in HDMI 1.3 and above there is an automatic lip-sync function. When using a Sonos connect through its line in, the Sonos needs to convert the audio signal to digital and make sure it can be time aligned if being sent to multiple Sonos devices. This processing makes the audio lag behind the video and no display that I know of has a setting to delay the video to match the audio.
Post 19 made on Tuesday March 21, 2017 at 18:04
FrogAV
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FWIW, most models have a headphone out jack built in to the remote, which of course is analog. You'd have to deal with batteries and such, thus the "FWIW", but figured I'd at least bring it up.
Ryan Posner
Frog AV
Post 20 made on Tuesday March 21, 2017 at 18:47
Ernie Gilman
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On March 21, 2017 at 16:50, BobL said...
In most situations the audio needs to be delayed because the video processing takes longer than the audio processing. Most receivers have a delay setting for this situation, in fact in HDMI 1.3 and above there is an automatic lip-sync function. When using a Sonos connect through its line in, the Sonos needs to convert the audio signal to digital and make sure it can be time aligned if being sent to multiple Sonos devices. This processing makes the audio lag behind the video and no display that I know of has a setting to delay the video to match the audio.

So...
In devices other than Sonos devices, the audio leads the video. Audio delay must be added to synchronize the signals.

In Sonos devices, audio delay is introduced which makes the audio lag (always?) behind the video signal.

What exceptions do we know of?
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 21 made on Wednesday March 22, 2017 at 01:39
buzz
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On March 21, 2017 at 18:47, Ernie Gilman said...
So...

In Sonos devices, audio delay is introduced which makes the audio lag (always?) behind the video signal.

What exceptions do we know of?

Almost always.

I like to call this "latency", rather than "delay" because the offset is deliberate, not some sort of forehead smacking oversight. The 70ms allows time for building data blocks and reacting to dynamic conditions on the network. This is why the Sonos system is so robust. Time alignment between players is within two milliseconds over the long term -- even if the network topology changes in mid flight. These "dynamic conditions" could be the result of a transport node going down or a blast of wireless interference.

The exception is for surround speakers associated with PLAYBAR. In this case the latency is reduced to about 35ms in a compromise to minimize lip sync issues. This can result in some difficulty if another player is Group'd with a PLAYBAR driven surround room. The Group'd rooms will use the standard 70ms latency while the surround room is using 35ms. If this creates an issue, one can adjust the surround room's delay as one would adjust a lip sync delay in most surround systems and align Group'd rooms with the surround room -- at the risk of impacting the surround processing lip sync offset.

Some people, particularly competitors, criticize Sonos for adding this latency. Is it necessary? An interesting experiment is to start simultaneous play with two identical conventional CD players and identical CD's. Since the clocks in the CD players are not absolutely running at the same rate, the players will drift out of sync over time. How long must the players run before the offset becomes obvious? Typically, by the end of the first track there will be obvious misalignment. In a Sonos system, after days of Group play, the alignment will remain within the two millisecond window. Sonos is actively managing the time alignment. If one is VERY perceptive, one might be able to point to an "adjustment event", but they are infrequent, very gentle and you'll miss it if you blink.

Last edited by buzz on March 23, 2017 18:36.
Post 22 made on Thursday March 23, 2017 at 07:06
BobL
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Almost all of the streaming devices need to add some delay-latency to convert to digital and time align the system. Some streaming devices (Paradigm, Yamaha) give you the option of just using it as an amp for the line in so you do not incur this delay and this works great for TVs.

An exceptions for Sonos would be if you are using a device with analog outputs like some cable boxes you can connect the analog output of the device to Sonos and the delay with the TV doing its video processing MIGHT eliminate the lip sync issue if the delays are close between the devices. If you are using the analog output from the TV then the video has already been processed and the latency the Sonos adds is definitely noticeable.
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