Do you have the full version of Bandicam? or watermark version?
Also when SMBX launch(s) theres a Box that says "Disable Frameskip" always check that....
Also you can always try OBS and another program i use for minior editing which is Handbreak,
You can cut footage edit some audio and what not, and it also compress the file about 1/10th of its size if your wanting it to upload to YT faster that is....
Heres some settings I recommend to you if you choose OBS/ Or if you have the full Version of bandicam or even FRAPS
0x720 (this is what makes it 720p on YT or that HD feat. you see)
FPS: Always choose 60 for a good quality
and Quality I'd go with 60-80 seems decent
AAC-- Advanced Audio Coding
44.1KHz,stereo,160kbps(this measures how loud you and the game will be if you have a mic for commentary or not)
I even made some guide if you want to use OBS and Handbreak myself for another Minecraft community I'm active on,
For Handbreak you want the video settings to be the same as the video
and the little RF button you see in the video settings have it be around 35-37 that ensures 720-1080p quality
Other than that you click on source find the file have it scan select the file again in destination have it re-named btw and then click start and it compress(s)
theres also a part where it says 0:00:00 thats if you want to cut out some footage but only that piece that remains that you have so if its 15min and you cut it from 5m to 5:30 that means that 30s piece is what compress(s) and is left everything else is ignored..
If you want to try out OBS and Handbreak ill link it here below:
Click here for OBS Download(s)
Click here for Handbreak DL's
Click here for a video guide to OBS and Handbrake if you wish with links there in the Descrip as well