0हल: वायरलेस वीडियो स्ट्रीमिंग समस्या

मेरे पास एक बहुत ही अजीब मुद्दा है जो वायरलेस। N नेटवर्क पर वीडियो चलाने में समस्याएं पैदा कर रहा है। वीडियो चलाने से नेटवर्क छोटी अवधि के बाद बंद हो जाता है। कभी-कभी यह केवल 2-3 सेकंड तक रहता है, जो सिर्फ एक वीडियो हकलाना कारण बनता है। अन्य बार ड्रॉप बाहर अधिक स्थायी है और ठीक करने के लिए लगभग एक मिनट लगता है, जब तक वायरलेस रेडियो बंद और पीठ पर है, जिस पुनर्संयोजन होता है.

Run­ning a con­tinu­ous ping dur­ing this res­ults in timeouts when the con­nec­tion drops. The con­nec­tion is more likely to recov­er with­in 2–3 seconds if the video is paused as soon as the prob­lem occurs. Now the strange part. If I sim­ul­tan­eously copy a large file over the wire­less at the same time as play­ing the video then play­back is fine and no drop outs occur! This is affect­ing a wire­less con­nec­tion between a Draytek Vigor2820Vn and 2 dif­fer­ent laptops with Intel 5×00 wire­less cards. Both laptops are run­ning Win­dows 7 x64. I have also tried with an Intel 6300 Wire­less card.

I have so far tested and estab­lished the fol­low­ing facts (नोट: all speeds are giv­en in bits not bytes)…

1. The dir­ec­tion of the file trans­fer does­n’t mat­ter, it can be to the cli­ent or from the cli­ent (उदा.. एक से सी या सी से एक को).  It can also be ini­ti­ated by the cli­ent, or by the oth­er end of the trans­fer (अर्थात. ini­ti­ated by C).
2. The file trans­fer can be to a dif­fer­ent com­puter from the source of the video, या एक ही, it always has the same “pro­tect­ive” effect. (अर्थात. file is stream­ing from C to A, फाइल कॉपी बी से एक है)
3. Play­ing just 1 video with a bitrate of 2Mbps does­n’t seem to exhib­it the issue? 2 Videos with a total of 4Mbps do suf­fer. Videos up to and includ­ing 13Mbps all exhib­it the same issue. High­er rates haven’t been tested but I expect them to have the same problem.
4. There are no oth­er nearby wire­less net­works effect­ing net­work per­form­ance, and file trans­fers work reli­ably at approx 70Mbps so the con­nec­tion is not band­width limited.
5. Increas­ing the buf­fer in WMP तक 30 seconds has no bene­fit. Fur­ther­more the jud­ders in video play­back still occur at the same time as the ping timeouts so the buf­fer does­n’t even seem to be working?
6. The router firm­ware is up-to-date, and it has had the wire­less board replaced without resolv­ing the prob­lem. The issue also occurred with older firmware.
7. The drivers for the wire­less cards are up to date. The issue also occurred the same with older drivers.
8. When the con­nec­tion cuts off it cuts off ALL wire­less cli­ents, even those not involved in the stream­ing so the issue *seems* likely to be at the router end of the con­nec­tion, not the cli­ent end? (अर्थात. when stream­ing from C to A, बी भी अस्थायी रूप से काट रहा है)
9. A web-down­load at ~300k/sec (2.4एमबीपीएस) does­n’t offer the same pro­tect­ive effect as the ~70Mbps file transfer.
10. The issue occurs even if the cli­ent (एक लैपटॉप) is on bat­tery or plugged in. So it seems unlikely to be power-man­age­ment related?
11. Dis­abled IPv6 without any benefit
12. Tried stream­ing video from both Win­dows 2003 (serv­er C) and Win­dows 7 (डेस्कटॉप डी) बदलाव के बिना मेजबानों, so prob­lem isn’t related to SMB 2.0
13. Tried play­back with a vari­ety of play­ers includ­ing Media Cen­ter 7, Win­dows Media Play­er 12 x 64, Win­dows Media Play­er 12 x 86, एमपीसी-HC x 64 तथा वीएलसी — all exhib­it the problem
14. Upgrad­ing to an Intel 6300 wire­less card makes no difference
15. The dis­tance from router makes no difference
16. The prob­lem hap­pens faster the more intense the traffic
17. The prob­lem hap­pens sig­ni­fic­antly less with a short­er wire­less key

My best the­ory is that the router has an obscure issue where it is redu­cing wire­less speed when it detects that the con­nec­tion is under low usage, but this low speed state isn’t suf­fi­cient for the peaks of required band­width in vari­able bit rate video streams and goes into some kind of error state which is only relieved when the video play­back is hal­ted. Copy­ing a file is suf­fi­ciently intens­ive to pre­vent this state being entered, but a web-down­load isn’t.

Next I’d like to try one of the laptops with Win­dows XP as the ओएस बजाय Win7 की, altho I don’t expect this to help. Then I’d like to try a dif­fer­ent router / wireless‑n वैप which if my the­ory is cor­rect will cure the prob­lem. Sadly I don’t have a source of a wireless‑n वैप या पल में रूटर.

If any­one has any oth­er ideas for things to try/test, or has a sim­il­ar prob­lem please get in touch!

अद्यतन 1 (5/जनवरी 2011)

I’m not the only per­son exper­i­en­cing this. Googling shows up a range of oth­er people who have had sim­il­ar issues but as yet no solu­tions. List of links below…

अद्यतन 2 (23-मार्च 2011)

I’ve updated vari­ous parts of the post, और नीचे दिए गए लिंक की एक श्रृंखला जोड़ा.

I’m at a point now where I need to test my laptop with a dif­fer­ent Wireless‑N net­work. If it works then I think I can con­clude there is a prob­lem with my router. If it does­n’t work then there is some­thing wrong with either Intel wire­less cards, or with Dell Stu­dio laptops!

https://www.sevenforums.com/network-sharing/110061-windows-7-wireless-connections-drop-out.html — Sound sim­il­ar, but not quite the same. My adaptor still sees wire­less net­works as far as I can tell

https://forums.whirlpool.net.au/archive/1300843 — Some people say­ing its Intel cards, but oth­ers say­ing chan­ging card did­n’t help. Noth­ing conclusive.

https://forums.lenovo.com/t5/W‑Series-ThinkPad-Laptops/INTEL-5100–5300-Network-Dropouts-Disconnects/m‑p/97708 — Anoth­er spec­u­lat­ing about Intel drivers, but still with an unre­solved issue, इसलिए बहुत मददगार नहीं

https://forums.smallnetbuilder.com/showthread.php?t=1997&page=3 — Sim­il­ar sound­ing prob­lem with a Belkin router. Prob­lem resolved by repla­cing router.

अद्यतन 3 (30-मई -2011)

I’ve tested the laptop con­nec­ted to 2 more wireless‑n net­works. It works without any issue. In con­clu­sion there is either a fault with the draytek or there is an incom­pat­ib­il­ity. Hav­ing already sent the draytek back once before I am rather dis­ap­poin­ted that draytek failed to resolve the issue.

If you’re think­ing of get­ting a Draytek, con­sider an altern­at­ive. I can recom­mend the Net­gear DGND3700