With Toast 7, you can burn videos to dvd very easily. Toast will convert the videos to the necessary format during the burn process. You can also add menus, edit out parts if prefered such as end credits.
Open Toast, press the Video tab. Then drag & drop the video file onto the main window. Then press the arrow in top left corner to open window-drawer which offers you options & type of disk you want to burn. I'd suggest it's probably best to have the encoding set to automatic (otherwise the video might not fit on the disk if you're not sure.) You can check the options, for audio make sure it's Dolby. For movies, 192 kbps is fine. Perhaps for music-video you'd want higher. By having audio set to dolby & to 192 allows much more space for the video content to be converted at reasonable quality. PCM audio setting uses up much more space than dolby & is not necessary. For video quality, if it's an action type video then you'd want high quality & fast motion estimation set high (around 8 Mbps or less if you use pcm audio which uses 1.6 Mbps.) When you're ready to burn, put a blank disk in & press the red burn button at bottom left corner of Toast. I'd suggest a DVD-RW disk initially if your burner supports it so you can check the results before the final burn. BTW the conversion process may take many hours depending on your cpu speed. You should keep your total bit rate (video & audio combined) below 9 Mbps for safety. Otherwise your player may struggle to play it & skip or freeze at parts. That's why I recommended using the Automatic setting.
You can find extra references to using Toast here: 1.
How to keep info of download when burning on a cd, & also this one 2.
Compressing file to fit on one 4.7GB DVD-R. For more, use the Forum search button & type in Toast & look for those threads in Mac / OSX sections.
Whilst I said PCM 16 bit audo uses 1.6 Mbps, PCM 24 bit audio will use about 2.4 Mbps. Whereas Dolby uses between about 0.192 to 0.320 Mbps. For audio you get from downlded videos, it's a waste of space using PCM. The quality of such audio will only be dolby anyway. Absolutely nothing to gain using PCM audio & simply a loss of potential video space conversion & bit rate.