Can we assume that your 1080p30 is an AVCHD.mp4 file or other?
You manually or the project automatically should set the project preset to
DSLR 1080p30 @29.97
(If your frame rate is really 30 instead of 29.97, then go with DSLR 1080p30 instead of DLSR 1080p30 @29.97)
See the following link for setting the project preset manually
For your export
with Presets = MP4 - H.264 1920 x 1080p30
Please let us know if you have further questions on this or need clarification on anything written.
Thank you for your quick reply! That is EXACTLY the information I was looking for.
Thanks for the reply and the good news that the suggestions are what you were seeking.
Please remember, do not hesitate to ask if you have further questions on this or other and to ask for clarification on anything written.