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Audio synchronization
Posted : Thursday, July 12, 2007 1:18:22 PM(UTC)
Joined: 7/11/2007(UTC)
Posts: 3

I am working on a presentation demonstrating software that control a mechanical device. The narrator will explain the software (recorded with My Screen Recorder Pro). There will be three video sources: the My Screen Recorder Pro recording, a camcorder recording the narrator's face, and a camcorder recording the device's movements.

In postproduction, using Video Edit Magic, I will use selected parts from the three mentioned sources and combine them make my presentation.

Audio can be done one of two ways; either recording audio through My Screen recorder Pro during desktop screen capturing, or recording audio on second computer using specialised sw for it (Cool Edit Pro).

The question is: Is it easier (in real life, using Video Edit Magic) to synhcronize audio with video (especially when the narrator's face is presented) if audio is captured in MSR Pro, or would it be easier to work with a separately recorded .wav file?
DeskShare - Support  
Posted : Monday, July 16, 2007 12:39:11 PM(UTC)
DeskShare - Support

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If possible, it would be best to record audio from the camcorder, along with the video, in a single file. If the audio and video are recorded into a single file, they will automatically be synchronized.
Posted : Monday, August 6, 2007 3:20:33 AM(UTC)
Joined: 8/6/2007(UTC)
Posts: 2

I'm a new user. Love the software! *Sooo* powerful!
I made a selection of videos over the weekend that I want to 'join' together & issue later *today*!

2 questions please:
1. I notice that there's a slight time lag between the video & audio, despite being recorded together. In other words, my voice is heard shortly after my image has mouthed the words. Please advise.

2. Also, I recorded the videos in .avi format as I want to import them into a flash player for streaming on our website. The flash player that I have imports .avi & .mpg; hence my choice. I've since read in your help files that .wmv is perhaps better for web-based videos due to size and streaming ability :-(

The collection of files I've made is over 1.6Gb!

Please would you be so kind as to advise me:

a) Whether files of that size will stream OK or will they make the website really slow in loading?

b) How best to reduce the size of my files to a more reasonable size please.

c) Whether I need to use this flash player or whether your software can somehow be used to stream the videos? (E.g. Do I need a "stand-alone" player?)

Many thanks indeed in advance for your prompt assistance.
Hopefully, I can join these together & get them on the web site later today.

Kind regards,
DeskShare - Support  
Posted : Monday, August 6, 2007 7:42:24 AM(UTC)
DeskShare - Support

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Joined: 2/27/2004(UTC)
Posts: 1,814

Was thanked: 30 time(s) in 26 post(s)

You can correct the audio/video sync issue by making sure the audio and video start at the exact same time on the Timeline. Just click on each, and look at the bottom of the screen for "Selected clip start". Make absolutely sure they both show exactly the same number there. If they don't, adjust the numbers to be identical.

If the actual recording is slightly off, you can shift either audio or video ahead or back, as needed, to make them line up.

The newest Flash video and the newest WMV produce very similar file sizes. If the Flash converter you're using is good, there's no reason to change from what you're familiar with.

A 1.6 GB file, properly prepared and with enough Internet bandwidth, should stream fine. However, streaming files that large might be very expensive—many Internet Service Providers charge based on the total number of megabytes downloaded. If the 1.6 GB collection is in AVI format, converting to either WMV or Flash should greatly reduce the size.

If the size reduction from format conversion is not enough, you would have to look at specific settings, such as audio quality, video resolution, and video bandwidth. Video Edit Magic provides several special WMV profiles for streaming video that you can experiment with. I can't advise you on your Flash converter, which is not a DeskShare product.

Windows Media files can be streamed to the Windows Media Player (on Windows computers) and to various alternatives such as VLC on other platforms. Almost any computer can play Windows Media files (WMV), though non-Windows computers may need a player installed. However, if your hosting provider streams Flash video only, they won't be able to do anything with a WMV file. You should check with whoever will be hosting your video.

If you'd like to stream Windows Media files (WMV and WMA), DeskShare does provide a service called Video Desk. If you can reduce the video size (our maximum storage is 1 gigabyte) you may find Video Desk a useful tool to solve your problem.

I hope this is helpful.
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