There is a quality setting for 3D slideshows in the preferences area.
Its located on the 'Produce' tab of the preferences settings.
There is no 'Best Quality' settings for youtube. I have found that using bitrates above 3000 and producing files for 1280x720 kicks in the YouTube HD viewing option. That means people viewing your videos will be able to watch in the higher quality, larger size video viewer, which is nice, even if its not true HD.
You do not need an HD camera for that to work, but obviously the better resolution of your source material the better the final product.
Youtube will accept almost any video format you can give it. What matters is the framesize and the bitrate. For example, look at this video:
http://www.youtube.com/watch?v=Rs86GNXIAes This is not HD content, yet it can be viewed as HD on youtube because I rendered it as 1280x720 with a 3000kbps bitrate. If there's lots of movement/motion/animation in your content, you will want to increase the bitrate, but it takes much longer to upload.
This message was edited 3 times. Last update was at Feb 23. 2009 16:23
Win8 64-bit Pro Retail
Intel i7-4770
16GB DDR3 1600 8-8-8-24
MSI Z87-G45 Motherboard
ASUS GTX 660 Direct CU II OC 2GB GPU
1 TB RAID 1 (mirrored) Drive Array
Several scratch drives for video, TMP, pagefile.