network recording stutter when played?

[zenith]

rebooting a box won't fix bandwith useage...
this does really seem like a local network read/write issue.
if you are recording HD over a network & watching it back as you are also recording, make sure your local network is up to it.

i have a wndr3700 netgear router that i am sure is up to it as it does it on box upstairs that is exactly same as one i am having the issue with downstairs!

 

[judge]

No idea about the wndr3700 netgear router, but recording & watching over a network is obviously showing you issues.

 

[pooface]

rebooting a box won't fix bandwith useage...
this does really seem like a local network read/write issue.
if you are recording HD over a network & watching it back as you are also recording, make sure your local network is up to it.

If the issue is due to the one box being slowed down due to cpu usage, then it could help. But I do have a feeling this is a bandwidth issue also...

I used to have issues in the 100mbit network, when I would have the nas downloading stuff off the internet, and trying to stream 1080p files from the nas to the box... Since the nas is now connected to 1gb connection, as I said, I do not have this issue now. So that goes to show (as I'd suspected in the first place), it was a limitation of the 100mbit (10 mb/s) stream across the network... Now, the nas can transfer 100 mb/s, so downloads and streams (as long as they're not over 10mb/s due to the 100mbit limitation on the box) can run simultaneous and cause no problems...

 

[pooface]

Looking at the wndr3700 router, it is a gigbit router, so shouldn't be causing issue like I had. But, if you are trying to recording to the box, and stream from the box at the same time, then unless the bandwidth of the program you are recording is under 5mb/s (the down and up will be 10mb/s that way), you will have problems... So, you need to be doing a recordig of the same program at the same time, to the boxes. Which, will not work, as you will then be using 20mb/s to the server box...

 

[pacha2]

Can you confirm that it is the Duo that is performing the recording? So this is a local to the internal harddrive.

The XP boxes are just streaming the recorded files as I understood it.

 

[zenith]

Can you confirm that it is the Duo that is performing the recording? So this is a local to the internal harddrive.

The XP boxes are just streaming the recorded files as I understood it.

yes the duo has the hdd 3.5 installed and is used for viewing recordings to the xp boxes.
i have the stutter or slow motion issue when i play a film or program in hd on xpdining downstairs while it is recording.
stops slow motion when recording is stopped.
if i do same on one upstairs no slow motion issue.
i try this on each box then stop playing recording accordingly.

 

[pacha2]

How is the CPU activity after a reboot? When idle the CPU usage on my boxes is between 1%-5%.

My experiences have shown that streaming an active recording requires significantly more CPU usage as the NFS client / Media Player is constantly adjusting to changes in the file.

I still believe your bandwidth is fine as you can play the same file when the recording has finished.

 

[Rob van der Does]

I still believe your bandwidth is fine as you can play the same file when the recording has finished.

Playback a file while the recording is still going on means using double bandwidth: one for the recording and one for the playback.

 

[pooface]

I still believe your bandwidth is fine as you can play the same file when the recording has finished.

Either I've misunderstood things, or you have...

He's saying that he's recording to the networked hdd, and trying to play from it at the same time... This means, that it's got bandwidth going up and down. After the recording has finished, he's only got the bandwidth going down (and minimal bandwidth such as requests, checks etc going up, but they're virtually nothing). So, if it works fine just streaming the recording (which is basically what it's doing), then all good and fine.

Also, it could be that there's a longer cable run between the boxes, meaning that there's more chance of a lower transmission speed...

 

[pooface]

Playback a file while the recording is still going on means using double bandwidth: one for the recording and one for the playback.

Dang, you just beat me to it

 

[Rob van der Does]

Dang, you just beat me to it

Only because you wrote the longer message

I don't know if OP also uses switches? Also in a 100Mb-LAN it is useful to use GB-switches, as they are a junction of streams (several streams going through a switch may use the full bandwidth of it).

 

[pacha2]

My interpretation was that the Duo was recording to a local HDD and the XP1000's are streaming this same file residing on the Duo.

For this scenario the bandwidth requirement would be the same whether the recording is active or not.

Can you confirm which box the timers are setup on - receiving the satellite signal and then recording to HDD please.

 

[zenith]

Either I've misunderstood things, or you have...

He's saying that he's recording to the networked hdd, and trying to play from it at the same time... This means, that it's got bandwidth going up and down. After the recording has finished, he's only got the bandwidth going down (and minimal bandwidth such as requests, checks etc going up, but they're virtually nothing). So, if it works fine just streaming the recording (which is basically what it's doing), then all good and fine.

Also, it could be that there's a longer cable run between the boxes, meaning that there's more chance of a lower transmission speed...

i make the recordings through the vu duo not from the xp1000 boxes just view them on them.
the xp1000 upstairs with no issue has the longest cable from router (about 15m)the dining room is on a 1m cable as router is right next to it.

 

[zenith]

How is the CPU activity after a reboot? When idle the CPU usage on my boxes is between 1%-5%.

My experiences have shown that streaming an active recording requires significantly more CPU usage as the NFS client / Media Player is constantly adjusting to changes in the file.

I still believe your bandwidth is fine as you can play the same file when the recording has finished.

cpu varies between 30% and 50% while playing recording about 93% idle.

 

[judge]

Have you tried swapping the viewing boxes around so to see if the issue still exists?

 

[zenith]

Only because you wrote the longer message

I don't know if OP also uses switches? Also in a 100Mb-LAN it is useful to use GB-switches, as they are a junction of streams (several streams going through a switch may use the full bandwidth of it).

i have a gb switch on one upstairs.one downstairs is direct to router.
just like to add i appreciate the comments and advice on this issue i am having and i am trying all helpful tips when offered!

 

[zenith]

Have you tried swapping the viewing boxes around so to see if the issue still exists?

i was going to try that tomorrow if i get time.
will see how it goes.

 

[zenith]

My interpretation was that the Duo was recording to a local HDD and the XP1000's are streaming this same file residing on the Duo.

For this scenario the bandwidth requirement would be the same whether the recording is active or not.

Can you confirm which box the timers are setup on - receiving the satellite signal and then recording to HDD please.

yes timers are setup on the vu duo and either watched on the duo or the xp1000 boxes.

 

[pooface]

i have a gb switch on one upstairs.one downstairs is direct to router.
just like to add i appreciate the comments and advice on this issue i am having and i am trying all helpful tips when offered!

Next best thing to try then, is swapping the boxes around like judge mentioned... This will then go to show whether it is the one box in particular (whether it be settings, or the box itself)... If the on downstairs (think that was the one you were having problems with) still does not have issues upstairs, then it's likely to definitely be the network setup...

 

[Bat]

Hi,
I only have a duo and a NAS but I do know what you're doing is a highbandwidth operation.
I think the Duo could be the bottle neck with its 100 port and everything else its doing, you may need a NAS to split the load from the duo...
Is your router gigabit on the lan side?
Ideally you need everything feeding into a gigabit switch
Cheers,
Gavin