[mythtv-users] Does Fast Forward Work for anyone?

[Eric Dalquist]

Do you mean 802.11g? I had been streaming HD captures from a HDHomeRun 
over 802.11g without too much trouble. That was through 2 drywall walls 
and was fine as long as the microwave was off and no other computers 
were on the network. You are correct though that 22/24mbps is about the 
max realistic throughput for 802.11g.

802.11n is another matter, I just updated my router firmware and now the 
802.11n chipset in it plays nice with my MacBook Pro 802.11n chipset. I 
now get real-world speeds that max out around 72mbps, the router is much 
more tolerant of the microwave and other computers can easily be using 
the network while I stream HD content (~22mbps). My usable range for HD 
streaming also increased by ~ 25%.

I will say that fast-forward over the 802.11g connection wasn't the best 
but I really only used the 30second skip forward 5 second skip back 
buttons. Now that I'm on 802.11n fastforward/rewind work better but the 
skip buttons are still the easiest.

-Eric

PS: I'm using a Linksys WRT-350N with DD-WRT v.24-RC7

Misty P wrote:
> lemongecko at gmail.com wrote:
>   
>> On 4/21/08, allene222 <nabble at oldpaloalto.com> wrote:
>>     
>>> When FF is set to 3x is goes a little faster maybe, maybe not.  On
>>> 5x is jerks ahead 1 second every second - not too useful.
>>>       
>> This is *exactly* the behavior I saw. And this was with recorded
>> content coming from my PVR-500, NOT JUST MPEG-4 .avi files. Works fine
>> on the combined FE/BE, so I don't think it's a seek-table issue. I'll
>> yank the FE out of the bedroom and try it hardwired tonight. Any
>> metrics I should try and gather at the same time? Anything in
>> particular I should look for in the log files that might be of use?
>>     
>
> If you're trying to stream ATSC HD over 802.11n, stop right there.  Don't 
> pass go, don't collect $200, go straight to jail.
>
> 802.11n's real-world throughput is 22 mbps.  Yes, the specification says 45 
> mbps, but there are a bunch of technical details as to why real world you're 
> going to top out around 22mbps.  And that *assumes* that your AP and laptop 
> are both in the middle of a cornfield.  Once you add in neighbors with their 
> own APs, wireless phones, microwave ovens, and all the other things that can 
> gunk up the 2.4GHz spectrum, your throughput goes wayyyyyy down.
>
> ...then add in that you're trying to push the stream 3x, 5x, etc. faster 
> than normal via fast forwarding, and it doesn't surprise me that it wouldn't 
> work well over wireless.  (or at least, not 802.11n.)
>
>
> Besides, do you *really* want to broadcast your porn collection to your 
> neighbors?  (Or worse, do you *want* them to know that you watch Oprah? 
>  :) )
>
>
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