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support
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Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: August 27 2008 at 11:22am | IP Logged
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Juice and Danny,
Both of your support FTP accounts have been updated with the media engine v5.12.8.8 engineering release. Please download the entire contents of the “DLL Only v5.12.8.8” directory in your FTP account.
To use the update, simply replace your existing files with the following updated files:
LanScape_Software_Developer's_Reference.chm (optional)
LMEVoip.dll
LMEVoip.lib
LMEVoipManaged.dll
SipTelephonyApi.h
Very Important:
Make sure to re-build your VOIP apps using the SipTelephonyApi.h header file if you are developing a native C/C++ VOIP app.
Our tests here have shown good results relative to removing broken/choppy multimedia audio playback. We look forward to your feedback as soon as possible.
How to use this release:
1)
Rebuild your VOIP apps.
2)
When you start your VOIP apps, make sure to specify a value of 2 (double buffering) for the following two START_SIP_TELEPHONY_PARAMS values:
PlaybackBufferingDefault
PlaybackBufferingDuringSounds
Both can be set to the same value.
3)
If your VOIP app plays back broken or choppy audio, it means that your host PCs multimedia hardware and installed drivers are not capable of handling “real time” 20 Ms double buffered sample block data. In this case, you should set the above buffering values to 3 and retest. On some machines here, we actually had to configure our VOIP apps (i.e. the media engine) to use quad buffering to completely remove all noise artifacts from play back audio.
Characteristics we noticed during playback audio testing:
We would think that as time progresses, host multimedia drivers and underlying hardware would become better and better, be more consistent and exhibit lower latencies relative to sample block record and playback.
What we have discovered shocked us a bit. Even when using new Intel Quad core motherboard based hosts + Windows XP or Vista, the “real time” multimedia playback characteristics have gotten worse than some older machines (2-3 years old) that we use for test purposes.
Is it the OS, the sound hardware drivers or the multimedia hardware or the combination of the previous three? Not sure at this point. What the audio industry needs is a quantifiable record and playback low latency multimedia capability that is built right into the OS that has the characteristics of ASIO or kernel streaming. Maybe someday…
On the other hand, we may simply decide to support ASIO in the media engine to achieve the low latency record and playback audio and be done with it all. Not sure yet.
Support
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bitherder
Intermediate
Joined: August 14 2007
Location: United States
Posts: 9
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| Posted: August 28 2008 at 8:53am | IP Logged
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Hi Support -
Please will you put a copy media engine v5.12.8.8 engineering release in my ftp space too?
Thanks,
skip
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support
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Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: August 28 2008 at 9:40am | IP Logged
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Hi Skip,
We hope you are well. Your support FTP account has been updated with the same engineering release image.
Please have a look in the "DLL Only v5.12.8.8" directory.
Feel free to repost with your feedback or test results.
Thanks Skip,
Support
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juice
Vetran
Joined: December 05 2006
Location: United States
Posts: 139
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| Posted: September 08 2008 at 3:27pm | IP Logged
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Hi there,
we have tested new dll on various machines and we also had machines where only quad buffering helped to reduce the noise artifacts.
The quality of audio is much better now, there are some (very rare) noises, but its a huge difference to what we had before so it would be great if we could get soon none time bombed build.
Thanks,
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support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: September 09 2008 at 12:48pm | IP Logged
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Juice,
Thanks for the feedback.
Yes we need to get you an official product image. Before we do, it would be good to also resolve this thread:
Double SipInCall messages
http://www.lanscapecorp.com/forum/forum_posts.asp?TID=450&TP N=3
Please post to the above thread with additional info as the result of your further testing.
Support
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support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: September 09 2008 at 1:04pm | IP Logged
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Danny and Skip,
Did either one of you perform testing to see if the v5.12.8.8 media engine’s audio improvements removed the broken/choppy local audio playback that Danny experienced on his laptop with Vista?
If you can, please post your test results and findings.
One other item:
The support agreement we have in place for your group has lapsed. If your group wants to continue uninterrupted support and product updates, please have the appropriate person from your team contact us via email to continue the current support agreement.
Thanks,
Support
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fdfrye
Intermediate
Joined: February 01 2008
Location: United States
Posts: 23
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| Posted: September 09 2008 at 1:17pm | IP Logged
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I just ran my test using the SingleLinePhone demo application. The splash audio was flawless. I am not in a position to do more extensive testing right now, but I would suggest that this test alone proves the fix has indeed been made. Thank you for your continued efforts on my behalf..
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support
Administrator
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Location: United States
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| Posted: September 09 2008 at 1:48pm | IP Logged
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Thanks Danny!
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LanScape Support Forum -> LanScape VOIP Media Engine™ - Technical Support
Topic: Broken Audio in SingleLinePhone Sample Project
