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Wireless Video QOS Questions

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dabench

Senior member
I have a new Buffalo WRZ HP300 N router and I am using it to stream video to my xbox 360. I have a couple of questions about some of the QOS settings.

1)There is an option for multicast rate and currently it is set to 11Mbps. Does that mean that at most video will be streamed at 11Mbps to the Xbox and anything that required greater bandwidth will stutter?

2) There is a number of retries and that is set to unlimited for video priority. Wouldn't I benefit from setting this to a low value because if a video packet is lost I really don't need it anymore because it's already too late?

3)Is there a way to actually verify that packets contatining movie data are really being processed as video data in the qos system?
 
depends if your codec handles packet loss well. udp transport and codecs that don't mind packet loss would probably yield the best results.
 
Emulex said:
depends if your codec handles packet loss well. udp transport and codecs that don't mind packet loss would probably yield the best results.
Click to expand...

Thanks. That sorta answers question 2. What codecs would handle packet loss well? I'm streaming WMV files.
 
streaming how? tcp is not very good at being lossy - a udp transport where loss is disregarded and there isn't much session setup time (think realvideo iirc) works better.

the codec and player have to care about loss - mplayer/xbmc usually doesn't carp itself when big chunks go missing - alot of players trip out and get really miffed when loss occurs.

so you have to ask yourself so you want:
1. buffering - wait - play (endlessly sometimes?)
2. stop/dead - hit something to start over
3. blocky/chunky broken video that just keeps on trucking.

the last part is bitstream re-arrangement - does your transport allow you to dial down from 2megabit to 64kbps? (apple requirement for streaming so 3G to edge works) automatically? if not you'll end up in a cycle as bitstream keeps moving around. this is hard to do without live transcoding obviously
 
Emulex said:
streaming how? tcp is not very good at being lossy - a udp transport where loss is disregarded and there isn't much session setup time (think realvideo iirc) works better.

the codec and player have to care about loss - mplayer/xbmc usually doesn't carp itself when big chunks go missing - alot of players trip out and get really miffed when loss occurs.

so you have to ask yourself so you want:
1. buffering - wait - play (endlessly sometimes?)
2. stop/dead - hit something to start over
3. blocky/chunky broken video that just keeps on trucking.

the last part is bitstream re-arrangement - does your transport allow you to dial down from 2megabit to 64kbps? (apple requirement for streaming so 3G to edge works) automatically? if not you'll end up in a cycle as bitstream keeps moving around. this is hard to do without live transcoding obviously
Click to expand...

I have no idea how xbox does the steraming. Is it tcp or udp? I didn't think the xbox gave you any choices. Just chose the pc and bam it goes.
 
Well, to answer your first question...

dabench said:
1)There is an option for multicast rate and currently it is set to 11Mbps. Does that mean that at most video will be streamed at 11Mbps to the Xbox and anything that required greater bandwidth will stutter?
Click to expand...

Yes and no, the wireless is "set" to transmit up to 11Mbps, however that doesn't mean that if you're using the LAN ports on the router, that they are also limited to that speed. Your multicast rate is just for the wireless only.

Your LAN connections for the router will continue to operate with whatever is left over depending on your router. This of course is assuming you're currently streaming something over the wireless and other computers still need access to the outside world/internal assets
 
somethingsketchy said:
Well, to answer your first question...



Yes and no, the wireless is "set" to transmit up to 11Mbps, however that doesn't mean that if you're using the LAN ports on the router, that they are also limited to that speed. Your multicast rate is just for the wireless only.

Your LAN connections for the router will continue to operate with whatever is left over depending on your router. This of course is assuming you're currently streaming something over the wireless and other computers still need access to the outside world/internal assets
Click to expand...

Ok, thanks for the response. I'm ONLY using wireless for streaming so I guess I am limiting myself to only 11Mbps. I guess I should set my rate to 54Mbps since the device is less than 15 feet from the router.

I'm still a little fuzzy on quetion 2. Should I shouldn't I limit the amount of retries for packets that are VO priority?
 
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