Best Settings for CamStudio to Sync Audio and Video





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Published on Mar 7, 2010

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I just created this video after a bit of trial and error (and research!) that demonstrates how to set up CamStudio 2.5 so that the audio and video stay in synchronization throughout the length of the video.

Getting CamStudio to synchronize the video to the audio requires that the "Playback Rate" in Video Options divides evenly into 1000 milliseconds, resulting in the entry that goes in the box above it, "Capture Frames Every".

This basically means that you have five options for playback rate/frames per second (as CamStudio does not allow fractional entries in the "Capture Frames Every" box).

You must use, therefore, 40 milliseconds with 25 frames/sec, or 50 milliseconds with 20 frames/sec, or 100 milliseconds with 10 frames per second,
or, if you are a mad scientist, 20 milliseconds with 50 frames/sec or 25 milliseconds with 40 frames/sec.
The first two settings mentioned are plenty adequate for 90% of applications, though.

Any other settings will cause a lag to develop in the audio that will get worse and worse as time passes.

This helpful information came from the following two links as sources:

Though I've seen it often stated that you can use 15 fps with a "Capture Frames Every" setting of 66, that still sums to 990 (15 X 66), as does 30 fps and 33 (30 X 33).

Those settings will slowly cause lagging to occur.

I haven't tested whether it will matter sufficiently in a 10-minute-MAX YouTube video yet, but it probably will be a problem even at that length.

The settings that multiply to equal 1000 are the best optimized ones, as 1000 milliseconds is equal to 1 second, but 990 milliseconds is clearly not!

I hope people find that helpful, and try to create their own screencasts.

[Edit: 03/23/10] Although these settings keep the sound and video in sync, they are not the only important ones. It is important to also set your video display settings in Windows so that "Hardware Acceleration" is turned completely off to avoid mouse jitter issues and other problems. Open the Display Settings control panel (right-click on the desktop background and select "Properties"), then select the "Settings" tab. From there, select the "Advanced" button. Once in there, select the "Troubleshoot" tab, where you will find the "Hardware Acceleration" slider. Slide that all the way to the left and hit the "Apply" button. Don't forget to set this back again when you are done screen recording. For recording Games and such, you may have to try setting the slider at higher settings for game functionality to be adequate.

Although I mention in this video just using the Microsoft Video 1 codec, I now feel that either the Camstudio Lossless Codec 1.4 or DivX are the easiest to use with good quality. There are videos on YouTube for best DivX settings you can also check out. (Just search)

I've achieved the most impressive results at 1280X720 (called 720p on YouTube) using Jawor's XviD - get 32-bit version from http://jawormat.republika.pl/xvid.html (or combined 64 and 32-bit version, but CamStudio needs the 32-bit version).

I made a video on Optimizing your settings for Camstudio over here: http://www.youtube.com/watch?v=Io2FYv...

I can also heartily recommend the following video series by phosgram:

Again, please "Like" this video and subscribe to my channel if this helped you out! And feel free to leave a comment - as you can see below, I do respond to just about all comments, especially ones from people needing help. (Video comments welcome!) :-)


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