0Résolu: Wireless problème de streaming vidéo

I have a very strange issue which is caus­ing prob­lems play­ing videos over a wireless‑n net­work. Play­ing the videos causes the net­work to drop out after a short peri­od. Some­times this only lasts for 2–3 seconds, which just causes a video stut­ter. Oth­er times the drop out is more per­man­ent and takes nearly a minute to recov­er, à moins que la radio sans fil est désactivée et retour sur, quoi reconstruction nca-tion se produit.

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.

Jusqu'à maintenant, j'ai testé et établi les faits suivants (Note: all speeds are giv­en in bits not bytes)…

1. The dir­ec­tion of the file trans­fer does­n’t mat­ter, il peut être à la cli-ent ou du cli-ent (e.g. de A à C ou de C à A).  Il peut également être ini-ti-ATED par le cli-ent, or by the oth­er end of the trans­fer (i.e. ini-ti-ATED par C).
2. Le transfert de fichiers peut être à un autre ordinateur à partir de la source de la vidéo, ou la même, il a toujours le même effet "protecteur". (i.e. fichier est de C à A ment flux-, copie du fichier est de B à A)
3. Play-ment juste 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. De plus-ment le buf-fer dans WMP à 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. Le routeur firmware est à jour, 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. Lorsque la connexion coupe il coupe TOUS les clients sans fil, même ceux qui n'ont pas participé à la diffusion de sorte que la question * semble * susceptibles d'être à la fin de routeur de la connexion, pas la fin cli-ent? (i.e. quand flux-tion de C à A, B is also cut off temporarily)
9. A web-down­load at ~300k/sec (2.4Mbps) does­n’t offer the same pro­tect­ive effect as the ~70Mbps file transfer.
10. Le problème se produit même si le climat-ent (un ordinateur portable) is on bat­tery or plugged in. So it seems unlikely to be power-man­age­ment related?
11. Dis­abled IPv6 without any benefit
12. Essayé vidéo ment courant des deux-Win-dows 2003 (serv­er C) et Win-dows 7 (bureau D) hôtes sans changement, si problème n'est pas lié à SMB 2.0
13. La lecture essayé avec une variété de joueurs, dont Media Center 7, Win­dows Media Play­er 12 x64, Win­dows Media Play­er 12 x86, MPC-HC x64 et VLC — all exhib­it the problem
14. Upgrad-ment à un processeur Intel 6300 wire­less card makes no difference
15. The dis­tance from router makes no difference
16. Le problème se produit plus rapidement la plus intense de la circulation
17. The prob­lem hap­pens sig­ni­fic­antly less with a short­er wire­less key

Ma meilleure théorie est que le routeur a un problème obscur où il réduit la vitesse sans fil quand il détecte que la connexion est en faible utilisation, 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.

Ensuite, je voudrais essayer l'un des ordinateurs portables avec Windows XP comme le LA au lieu de Win7, altho I don’t expect this to help. Then I’d like to try a dif­fer­ent router / wireless‑n WAP which if my the­ory is cor­rect will cure the prob­lem. Sadly I don’t have a source of a wireless‑n WAP ou routeur à l'heure actuelle.

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

Mettre à jour 1 (5/Jan-2011)

Je ne suis pas la seule personne en proie à ce. Googling shows up a range of oth­er people who have had sim­il­ar issues but as yet no solu­tions. List of links below…

Mettre à jour 2 (23-Mars 2011)

J'ai mis à jour les parties diffé-rents de la poste, et a ajouté une série de liens ci-dessous.

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, ou ordinateurs portables Dell Stu-dio!

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 - Certaines personnes disent-ment ses cartes Intel, 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, mais toujours avec une question non résolue, donc pas très utile

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

Mettre à jour 3 (30-Mai 2011)

J'ai testé l'ordinateur portable con-nec-ment à 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.

Si vous êtes pense-tion de rendez-ting un Draytek, con­sider an altern­at­ive. I can recom­mend the Net­gear DGND3700