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It depends,
Doing a 301 will transfer the search engine/user from Page A to Page B which is fine. However, if Page B and Page C have a similar URL structure like the first example you gave I would recommend using a canonical tag.
I would recommend using a canonical tag in any case, to let the search engine spider know which page you want it to crawl. If the content/URL is very similar on two pages or more I would highly recommend it to avoid duplication.
Oh yes and this SEOmoz article really breaks it down: http://www.seomoz.org/blog/building-links-with-video-content
There was a WBF on transcripts for videos a while back: http://www.seomoz.org/blog/video-seo-basics-whiteboard-friday-11080