Canon EOS 250D Advanced User's Manual page 240

L (3840×2160)
z
The movie is recorded in 4K quality. The aspect ratio is 16:9.
The frame rate is 29.97 fps (6) for NTSC and 25.00 fps (5) for
PAL, and movies are recorded in MP4 (C) format with ALL-I (W)
compression.
L (1920×1080)
z
The movie will be recorded in Full High-Definition (Full HD) quality. The
aspect ratio is 16:9.
The frame rate is 29.97 fps (6) for NTSC and 25.00 fps (5) for
PAL, and movies are recorded in MP4 (C) format with ALL-I (W)
compression.
Fixed 1st frame
z
When taking the first shot, metering is performed to set the exposure
automatically to match the brightness. The exposure setting for the
first shot will be applied to subsequent shots. Other shooting-related
settings for the first shot will also be applied for subsequent shots.
Each frame
z
Metering is also performed for each subsequent shot to set the
exposure automatically to match the brightness. Note that if functions
such as Picture Style and white balance are set to [Auto], they will be
set automatically for each subsequent shot.
8
Select the desired movie recording
size.
9
Configure [Auto exposure].
240