Ideal export settings and file size for one-hour webinar from PowerPoint Slides and Audio file

Hello everybody,

I looked into the previous messages about this topic, but I couldn't find all the answers I need for my Premiere Pro cut from a PowerPoint presentation.

1) I exported from PowerPoint both an mp4 file of the slides and the list of JPegs with a 1920x1080 resolution (File>Export> and then chose MP4 or JPEG. For the MP4, I set the duration of the slides to 30 sec (because anything more for some reason made the export fail):the final file size of the Mp4 is 183MB. While the 26 JPEG files of this presentation (26 slides total) vary from 198KB to 414KB each.

2) I importetd both into Premiere and they both work just fine. I created a sequence to match the length of the audio track, which is 1 hour.

3) Export moment: looking at the chain of messages I read here, I set it to:

Format: H.264

Preset: Match Source _Adaptive Low Bitrate

Under Video Settings: VBR, 1Pass and Target Bitrate:5 and Maximum Bitrate:5

And the file size from either the original PowerPoint Mp4 file or from the JPEGs is 2249MB

Is that normal?

And if yes, what could be the way to make it smaller once exported from Premiere to give to the client to put on their Youtube channel or other web platform?

Thank you so much for your help

Evi