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New Contributor
Posts: 3
Registered: ‎12-22-2011
My Device: Blackberry 9800
My Carrier: MegaFon

Audio latency in VoIP client on BlackBerry OS6

Hi all,

I'm developing a messenger application for Blackberry smartphones. Part of this application is VoIP connection between two users. We are using AMR-NB codec and RTP transport protocol to transfer voice data over IP network.

 

During testing we've found audio latency about 4-5 seconds on BB OS6 version devices. It is working fine on OS 5 and OS 7. During search inside Blackberry Development forums I've found that root cause of the issue is buffer which have been introduced in OS 6. OS 5 has no such buffer and real time audio playing with small latency about 500 ms.

Also there is a new API to set buffer size to zero is available in OS 7. So we small latency in 7 version too.

 

At the current moment I've not found a way to reduce the latency. Has any one resolved it ? Please help me with solution.

 

Thanks.

Developer
Posts: 709
Registered: ‎09-10-2009
My Device: 8520, 8900, 9000, 9300, 9650, 9700, 9780, 9800, 9810, 9900, 9930
My Carrier: Verizon

Re: Audio latency in VoIP client on BlackBerry OS6

Yes. Did you go to devcon? I think it is covered in devcon 57 IIRC.

New Contributor
Posts: 3
Registered: ‎12-22-2011
My Device: Blackberry 9800
My Carrier: MegaFon

Re: Audio latency in VoIP client on BlackBerry OS6

Thanks for your answer, Aviator168. But I'm a new user here. Could you explain me how can I get information from DevCon ? As I understand this is the Blackberry Developers Conference. Am I right ?

Developer
Posts: 709
Registered: ‎09-10-2009
My Device: 8520, 8900, 9000, 9300, 9650, 9700, 9780, 9800, 9810, 9900, 9930
My Carrier: Verizon

Re: Audio latency in VoIP client on BlackBerry OS6

Do a search on the web and you will find the video.

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Contributor
Posts: 49
Registered: ‎12-16-2010
My Device: 9700
My Carrier: Vodafone

Re: Audio latency in VoIP client on BlackBerry OS6

I did search on Google "devcon 57 IIRC" but no luck finding that video. Could you suggest me where can I find it? Thanks