Audio sync issues

[BTWNetwork]

When we broadcast live there seems to be no problem with our audio syncing with the video, but when we watch archives the audio is way ahead of the video. Any suggestions on fixing this?

[ernielive]

Mind providing the details of your workflow?

CPU, RAM
Operating System
Encoding Method (Procaster, Studio, FMLE, Tricaster, etc)
Additional Hardware (Camera, capture card, etc) and how it's connected
If using Procaster, version number (open preferences, click "i" in top right-hand corner)
Results of a speed test run to New York, NY at www.newyork.speedtest.net

[cscc_itdl]

Ernie and co.,

I have the same thing going on (which I've seen in other forum threads here as well), and I'm fairly certain it's an issue on your side with post-event encoding or something related to it.

During the actual live event stream, audio and video are in sync as normal. As soon as the same footage is available on demand, however, the video drifts behind the audio -- sometimes (it appears) up to a minute behind. And it seems to get progressively worse the longer the event is.

Our setup ...

* Laptop: 17" MacBook Pro (Early 2011), 2.2 GHz Core i7, 8 GB of RAM
* OS: Mac OS X 10.6.8
* Software: Wirecast Pro 4.1.3 with Livestream pre-configuration
* Encoding: 696 Kbps (600 for Main H.264 16:9 video, 96 for 44.1 KHz mono audio) at 25 FPS with 50-frame keyframes
* Connection: College campus with GigE pipes -- Speedtest.net to NYC consistently yields upload speeds of 15 - 20 Mbps

If it was truly an issue on our side, wouldn't the audio sync issue happen during the live event as well? The fact that this only seems to happen after the original event -- with the on-demand delivery -- strongly indicates it's a post-production problem on your side.

I'd like to see a resolution to this sooner rather than later, as our on-demand streaming sync problems make us look amateur -- through no fault of our own. We've been using Livestream.com as a premium producer for 2 years as of this coming spring, and I've never seen consistently bad on-demand results like this in the past.

Jason
Columbus State Community College
http://www.livestream.com/columbusstate

[ernielive]

Jason,

Changing the profile from Main to Baseline in Wirecast's Encoder Presets normally resolves these types of sync issues. Give it a shot and let us know if that helps.

[BTWNetwork]

Jason or Ernie,

Any idea if the baseline switch helped? We are still experiencing this problem. It's totally fine live, but when you go back and watch an archived event it is horribly off. I agree with Jason, when he suggests this is happening on Livestream's end of things, but it reflects badly upon us.

Thanks,
Clint - BTWNetwork

[ernielive]

Clint,

You're still experiencing this issue even after switching to Baseline? Are you using the latest version of Wirecast?