Is there a program that can record both streaming audio and video. I watch a lot of online lectures and need like to record some of them.

The easiest way is to use the software already on your computer:

Mac Basics: QuickTime Player creates, plays, edits, and shares video and audio files - Apple Support

http://www.maclife.com/article/howtos/recording_video_your_mac_it_gets_even_easi er

This needs to be done in a series of steps.

1. Download YTD, a program that allows you to export YouTube streams to your computer desktop. http://www.ytddownloader.com/mac/ It can be used free or paid.

2. Using YTD's instructions, download the clips you need.

3. Download Toast, which is (as you probably know) is a paid application. http://www.roxio.com/enu/products/toast/titanium/

However, you can acquire it through package discounts, or by searching on eBay.

4. Since you want to burn a DVD, I assume you have a burner already. Using Toast, drop the video segments on the desktop, and burn them as Video.

In other words, Quicktime probably isn't the best tool for what you want to do. But Toast is ideally suited.