Capturing via s-video reduces/eliminates dot-crawl from RCA connectors.
If quality is important to you, I suggest using VirtualDub version 1.9xx and capture 720x480 lossless AVI. That eliminates compression artifacts.
UTvideo codec, HuffYUV, MagicYUV, Lagareth, all are preferred lossless AVI codecs.
If you have the codecs setup properly you can even render improvements in VirtualDub and remain lossless.
Final edits and delivery can be done in Powerdirector. This way you only suffer compression/generational loss a single time.
4:3 is 4:3, period. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
Nvidia GTX 960(4GB)/16GB DDR3/
Canon Vixia HV30/HF-M40/HF-M41/HF-G20/Olympus E-PL5.
Tape capture using 6 VCR, TBC-1000, Elite BVP4+, Sony D8 camcorder with TBC.
https://www.facebook.com/BarryAFTT

Thanks,
jcmjr