exporting from poser: the best codec is no codec IMVHO.  sharing a video rendered in poser: for iphone/ipad it's mpeg-4/h.264, whilst google uses flv.  if video is just for viewing on one's own computer, there are dozens of codecs, many of which have been suggested here in many threads with the same question, but none of 'em are standards, hence if ya try to post a vid using one of those geek codecs anywhere, few or none will be able to view it AFAIK. ye'll be deluged with the question "how do I view this?" from users who've only seen flvs on google.  quicktime was sposeta become a web standard, but many users hate it and can't get it to work. YMMV.