Canon EOS 70DN Basic Instruction Manual page 588

Troubleshooting Guide
The shutter makes two shooting sounds during
Live View shooting.
If you use flash, the shutter will make two sounds each time you shoot
(p.217).
During Live View and movie shooting, a white <
red <E> icon is displayed.
It indicates that the camera's internal temperature is high. If the white
< > icon is displayed, the still photo's image quality may deteriorate.
If the red <E> icon is displayed, it indicates that the Live View or
movie shooting will soon stop automatically (p.249, 287).
I cannot shoot a movie.
If [53: Wi-Fi] is set to [Enable], movie shooting is not poss ble. Before
shooting movies, set [Wi-Fi] to [Disable].
Movie shooting stops by itself.
If the card's writing speed is slow, movie shooting may stop
automatically. If the compression method is set to [IPB], use a card
with a reading/writing speed of at least 6 MB per sec. If the
compression method is set to [ALL-I] (I-only), use a card with a
reading/writing speed of at least 20 MB per sec. (p.3). To find out the
card's reading/writing speed, refer to the card manufacturer's Web
site.
If the movie shooting time reaches 29 min. 59 sec., the movie shooting
will stop automatically.
The ISO speed cannot be set for movie shooting.
In shooting modes other than <a>, the ISO speed is set
automatically. In the <a> mode, you can freely set the ISO speed
(p.257).
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