You can find Livestream's recommended encoding settings for the New Livestream platform here:
We also like to recommend encoding files with MPEG-Streamclip, which is a free install here:
If you are unable to upload clips that have saved locally from Livestream for Producers, I would also suggest that you please create a support ticket by sending a full description of the issue to firstname.lastname@example.org
, as those files should generally be within spec. We'd very much like to help you troubleshoot that issue further.
Thank you for using Livestream.