Thank you for your response. I was excited to try one of the presets you mentioned thinking that maybe there was something about how I had been doing it previously that was just incorrect, and that a preset could rule that out. Unfortunately, even using the presets I’m getting the same results.
First I tried various presets for Apple, Android, and even Kindle, but modified them so that they were the correct resolution for my project. No change; I was still getting the jump up in file size at the last moment, and MediaInfo was showing the “phantom bitrate” that simply didn’t make sense compared to the video bitrate.
Then I tried just using one of the presets without changing it at all, even though it wasn’t going to give me the resolution I needed. I tried the “Android Phone & Tablet – 960×540 29.97” preset, and didn’t touch and thing, and still got the same result: video bitrate says 1,500kbps, but the overall bitrate says 6,578kbps, and the file ends up being 6.27MB, way bigger than it should be.
Then I tried installing an older version of Media Encoder, CC2014 (version 2014.0). No change, still getting the file size jump at the end and the “phantom bitrate.”
Oh well, off to Adobe I go.