Sometimes I watch a video on YouTube that has poor quality. I want to find a similar video which has better quality. Is it possible in YouTube?
Similar videos are posted on the right side of the page in Youtube. However, the similarities are based on Channel, Keywords, and Titles.
Finding a similar video programmatically (via Youtube's API) will get you the same results as the sidebar videos displayed.
Unfortunately, this doesn't guarantee that you will find a higher quality video (try searching for Spongebob videos some time, SOOO many recorded with a phone pointed at a TV).
Sometimes you can find similar videos posted on other sites doing searches on Google's Video Search