Here are some copies of the most common video compression standards.

Note: In order to avoid copyright problems, this page contains only links to the latest working drafts of the ITU-T Recommendations or MPEG standards, and not the ratified version itself. I believe that those working drafts and the ratified versions are technically identical and differ only in the cover page, but I may be wrong.  In some cases, I added corrigenda or other useful information into the PDF file.