Canon VIXIA HF M30 Quick Manual page 546

Playback
I want to change the screen size.

 Select the screen size from the [View] menu, or drag the edge of the window.
The joining points between chapters are not played back smoothly.
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 If you do not combine files when creating a disc, the joining points between scenes may not be
played back smoothly. Also, if you combine the files, and multiple titles are created, the joining points
between titles may not be played back smoothly. To playback smoothly, place clips on the Working
area in a row in the edit screen, and export them as one video file, then write the file on a disc.
I can't play back video with ImageMixer 3 SE Player Ver.6.

 ImageMixer 3 SE Player Ver.6 can play back the following videos:
H.264 files
Discs created from the "AVCHD List" in ImageMixer 3 SE Ver.6 Video Tools.
Discs created from the "Blu-ray List" in ImageMixer 3 SE Ver.6 Video Tools.
Discs created from the "DataDisc List" in ImageMixer 3 SE Ver.6 Video Tools.
DVD (AVCHD)/Blu-ray discs created by [Disc writing] in ImageMixer 3 Launcher.
You can only play video files recorded with the camcorder with which ImageMixer 3 SE Ver.6
*
 Videos may not be played back properly if a playback freeware or codec is installed.

After saving a file in [SD-Video] tab as [For computer], the aspect ratio will become
4:3 when played back on WindowsMediaPlayer.
 In Windows XP environment, these files are played back in 4:3 aspect ratio.
 In Windows Vista environment, update to Service Pack 2 from WindowsUpdate to display in 16:9.
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is bundled.