Canon EOS Rebel T5 User Manual page 291

The exposure changes during movie shooting.
If you change the shutter speed or aperture during movie shooting, the
changes in the exposure may be recorded.
Zooming the lens during movie shooting can cause changes in the
exposure regardless of whether the lens' maximum aperture changes
or not. The changes in the exposure may be recorded as a result.
The subject looks distorted during movie shooting.
If you move the camera to the left or right quickly (high-speed panning)
or shoot a moving subject, the image may look distorted.
The image flickers or horizontal stripes appear during
movie shooting.
Flickering, horizontal stripes (noise), or irregular exposures can be
caused by fluorescent light, LED bulbs, or other light sources during
movie shooting. Also, changes in the exposure (brightness) or color
tone may be recorded. With manual exposure, a slow shutter speed
may solve the problem.
Display Problems
The menu screen shows fewer tabs and options.
In Basic Zone modes and in movie shooting mode, certain tabs and
menu options are not displayed. Set the shooting mode to a Creative
Zone mode (p.48).
The file name's first character is an underscore ("_").
Set the color space to sRGB. If Adobe RGB is set, the first character
will be an underscore (p.131).
Troubleshooting Guide
291