DLNA buffering on gigabit network

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zeus0r
Posts: 2
Joined: Fri Feb 09, 2018 2:56 am

DLNA buffering on gigabit network

Post by zeus0r » Fri Feb 09, 2018 3:06 am

hey there!

following setup:

win7 pc with ultimate media server ---------------- unitymedia connectbox router (gigabit lan ports) ---------------- philips 55pos901 tv (everything connected via ethernet cable)

when playing high bitrate files (~70 Mbit/s) on my TV via DLNA it starts buffering after some time. (pretty randomly - sometimes after a few minutes, sometimes after an hour)

what could cause this? i mean 0,07 GBit/s shouldn't be a bandwith problem on a gigabit network, right? any idea what's the problem there?

thanks

Nadahar
Posts: 1254
Joined: Tue Jun 09, 2015 5:57 pm

Re: DLNA buffering on gigabit network

Post by Nadahar » Fri Feb 09, 2018 4:46 am

It shouldn't, but there are a number of things that could impact this. My first suspect would be the ethernet port on the TV. Do you know that it is gigabit? I took a quick look at the TV's specs, and they conveniently fails to mention this. In the user manual they recommend using Cat 5e, which would indicate that it is only a 100 Mbps port.

Your network might not actually run at gigabit speed either, depending on your cabling. Only Cat 6 cables should be used, and they should not run along power lines, hard bends etc. If packet loss is high (due to interference/crosstalk), the speed will be reduced.

It might also be, if you're transcoding, that your computer can't keep up. If you're not transcoding it could also be due to a very slow disk access, if for example the media files are placed at another device on the network.

Since you have problems around 70 Mbps, I suspect that something in running in 100 Mbps though. 70 Mbps is typically around the maximum speed you can get out of a 100 Mbps connection.

zeus0r
Posts: 2
Joined: Fri Feb 09, 2018 2:56 am

Re: DLNA buffering on gigabit network

Post by zeus0r » Fri Feb 09, 2018 8:57 pm

Nadahar wrote:
Fri Feb 09, 2018 4:46 am
It shouldn't, but there are a number of things that could impact this. My first suspect would be the ethernet port on the TV. Do you know that it is gigabit? I took a quick look at the TV's specs, and they conveniently fails to mention this. In the user manual they recommend using Cat 5e, which would indicate that it is only a 100 Mbps port.
wow, you got it on your first guess. i just installed some speedtest app and it actually peaked at exactly 60 Mbps. thanks for your help mate!

Nadahar
Posts: 1254
Joined: Tue Jun 09, 2015 5:57 pm

Re: DLNA buffering on gigabit network

Post by Nadahar » Fri Feb 09, 2018 10:20 pm

That's good to hear. Sadly, manufacturers have a tendency to "forget" to mention the not-so-good specs, which also made my suspicious. Strangely, the Wifi NIC is much more capable than your wired NIC (that's a first for me). That means that by using a AC router, as long as your TV has a a strong signal, you should be able to get better bandwidth that way. They save money on the most insane things...

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