Canon EOS 70D Instruction Manual page 429

When the movie is played back, camera operation
noise can be heard.
If you operate the camera's dials or lens during movie shooting, the
operation noise will also be recorded. Using an external microphone
(commercially available) is recommended (p.269).
The movie has still moments.
During autoexposure movie shooting, if there is a drastic change in the
exposure level, the recording will stop momentarily until the brightness
stabilizes. If this happens, shoot with the <a> shooting mode (p.256).
No image appears on the TV screen.
Make sure the HDMI cable or stereo AV cable's plug is inserted all the
way in (p.316, 319).
Set the video OUT system (NTSC/PAL) to the same video system as
the TV set (p.319).
There are multiple movie files for a single movie shoot.
If the movie file size reaches 4 GB, another movie file will be created
automatically (p.266).
My card reader does not recognize the card.
Depending on the card reader and computer OS used, SDXC cards
may not be correctly recognized. If this occurs, connect your camera
to the computer with the interface cable, then transfer the images to
your computer using EOS Utility (provided software, p.456).
Troubleshooting Guide
429