Networking & Wireless forum

Question

Help with choppy stream from NAS to iPad to TV

by bluesjumper / January 10, 2013 11:51 AM PST

'm a bit ignorant on this subject so please educate me.

I have a Buffalo NAS where I keep my movie files. I stream the movies to my iPad 3 and then Airplay push them to my Pioneer HDTV (720P) via Apple TV 2. I have the latest Airport Extreme for my router.

The NAS is in an adjacent room about 20 feet away from the TV room (which has the connected Apple TV and iPad).

In many cases the video quality is excellent. But for other movie files it is choppy and unviewable. Last night, I took a movie that was unviewable on the iPad and wirelessly watched it on my laptop without any issues. Some details on the movie file: 3.5 GB 720P blue ray MKV. Codec H264 MPEG-4 AVC. Resolution 1280x536. Frame rate 23.976215

And recognizing that my iPad and Laptop have different connection rates, here are the details I pulled from the Airport Extreme on these clients:

Device Rate Signal
--------- ------ --------
iPad 52 b/g/n -67
Laptop 240 a/n -71
Apple TV 65 a/n -64


So why do some movie files play flawlessly off the iPad to TV and others don't? In my layman's terms, is it related to the 3.5 GB MKV file....ie, am I trying to play a movie too rich with info and my bandwidth can't handle it? Is my only (and simplest) solution to focus on the file/format?

Thanks!

Vlad

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All Answers

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Answer
What's wired and wireless?
by R. Proffitt Forum moderator / January 11, 2013 12:21 AM PST

Since WiFi is only one device and talk at a time and a stream from a wireless NAS takes a trip to the router and then out to the device your bandwidth is effectively halved or worse. There are decoder issues in many devices but for this discussion I'll not get into that but look at the overhead of WiFi.

A NAS on WiFi is not a good idea. Put that directly on the router, wired to avoid that loss.
Bob

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NAS is wired
by bluesjumper / January 11, 2013 6:15 AM PST

The NAS is plugged into my router. The Apple TV, iPad and laptop are wireless. Clearly my laptop can support a rate 5X faster than the iPad...I'm more curious to get perspective on how the file size/attributes may be impacting the streaming.

Vlad

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A lot of variables.
by R. Proffitt Forum moderator / January 12, 2013 10:35 AM PST
In reply to: NAS is wired

For example if the decoder is using a lot more CPU than other decoding you will see what you are reporting, I've never had any issue with HD content over a 50ish megabit link. Be sure your router is set to ignore 802.11b and try it with 802.11g only support or a few others.

I did see this on a few routers but HERE - "Airplay push" is going to swamp the network. You are push at least 2x the data versus a direct play. I think I would cure this with a second WAP to double my bandwidth.
Bob

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