Final Cut Pro X Exported Video Size

I tried the export media but the file sizes are too big, nowhere near as small as iMovie puts them out. I just want a simple .mov file at a decent 720P file size, which using the YouTube share option gives me.

The movie inspector shows that its a 1280 x 720 format, but that the video size is 1248 x 702

How can I change the size? Normally I export at 720P in iMovie and the video and format are both 1280 x 720. I did a screencast using Quicktime and due to the change in display size it's chopped off the toolbar at the top and a small portion of the dock. I've had to resize the clip in Final Cut to 95% of the original size to get it to fit in the 1248 x 702 size that it chooses to put it in.

As this was only a screencast the file size tends to be this small, but normally I shoot at full HD on my camcorder and the video can be about 10 mins in length. I used the export media function and the resulting file was about 8GB in size! iMovie would typically give me a .mov file anywhere between 700MB - 1.5GB depedning on the length of the video and that suited me fine, but there doesn't seem to be any way to get it that small using the Export Media. Not much of a problem really coz I'm fine using the YouTube share option to get what I want.

After much playing around with Compressor I managed to finally get the actual display size of the video to 1280 x 720. I created a custom setting by duplicating the setting for Apple Devices and tweaking it a bit, after an export the video is both in the format of 1280 x 720 and so is the actual display size. For some reason creating a custom setting from scratch or duplicating the default YouTube one and setting it to 1280 x 720 everywhere possible is still outputs the display size to 1248 x 702 which is very annoying.

But at least I found a way round it, it may only be a few pixels but it chops off the top and bottom of my content plus any graphics I create in the same size.

I can drag it and make it any size I like, it still shows 1280 x 720 format and 1248 x 702 display size and bits of my video are still chopped off. The only thing correct about it is that it's 720P format. I didn't have this issue with iMovie which seemed to give me the correct display size. Uploading it to YouTube the way it was just looked odd with bits of my video missing.

I've tried it with a Project imported from iMovie, direct import from my camcorder and with a screen record captured in Quicktime. All have been exported with the default 720P YouTube share option in Final Cut and then I get the funny display size. I'd never noticed it until I went to view the exported file for the screencast and noticed that it had chopped the top and bottom off because of the odd sizing.