The player shouldn't matter
The player working is it down to the browser
and being installed in Domino correctly. When you say they don't
work, what do you mean? Do you mean they don't start playing immediately
and have to download the entire file? If so if you are attaching
the file within a document, try attaching it with compression turned off,
then Domino can byte serve the file.
If you expect to be able to click and be able to jump forward in recordings
and back in recordings, then you really need a media server, which Domino
isn't. Lotus once had a companion product that did this for audio
and video, but it was killed a few years ago.