Canon EOS 250D Advanced User's Manual page 470

The shutter makes two release sounds during Live View
shooting.
If you use flash, the shutter will make two release sounds each time
z
you shoot (= 182).
During Live View shooting, a white s or red E icon is displayed.
It indicates that the camera's internal temperature is high. If the white
z
<s> icon is displayed, the still photo's image quality may deteriorate. If
the red <E> icon is displayed, it indicates that the Live View shooting
will soon stop automatically (= 215).
During movie shooting, the red E icon is displayed.
It indicates that the camera's internal temperature is high. If the red
z
<E> icon is displayed, it indicates that the movie shooting will soon
stop automatically (= 257).
Movie shooting stops by itself.
If the card's writing speed is slow, movie shooting may stop
z
automatically. For cards that can record movies, see page 7. To find
out the card's writing speed, refer to the card manufacturer's website,
etc.
If you shoot a movie for 29 min. 59 sec., the movie shooting will stop
z
automatically.
The ISO speed cannot be set for movie shooting.
In shooting modes other than <a>, the ISO speed is set automatically.
z
In the <a> mode, you can manually set the ISO speed (= 222).
The exposure changes during movie shooting.
If you change the shutter speed or aperture during movie shooting, the
z
changes in the exposure may be recorded.
Zooming the lens during movie shooting may cause changes in the
z
exposure regardless of whether the lens's maximum aperture changes
or not. The changes in the exposure may be recorded as a result.
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