Canon EOS REBEL T5 Instruction Manual page 177

Movie Shooting Cautions
White <s> and Red <E> Internal Temperature Warning Icons
If the camera's internal temperature increases due to prolonged movie
shooting or under a high ambient temperature, a white <s> or red <E>
icon will appear.
The white <s> icon indicates that the image quality of still photos will
deteriorate. It is recommended that you stop still photo shooting for a
while and allow the camera to cool down. Since movie image quality will
hardly be affected, you can still shoot movies.
The red <E> icon indicates that movie shooting will soon be terminated
automatically. If this happens, you will not be able to shoot again until the
camera's internal temperature decreases. Turn off the power and let the
camera rest for a while.
Shooting a movie at a high temperature for a prolonged period will cause
the <s> or <E> icon to appear earlier. When you are not shooting, turn
off the camera.
Recording and Image Quality
If the attached lens has an Image Stabilizer and you set the Image
Stabilizer (IS) switch to <1>, the Image Stabilizer will operate at all
times even if you do not press the shutter button halfway. The Image
Stabilizer consumes battery power and may shorten the total movie
shooting time or decrease the number of possible shots. If you use a
tripod or if the Image Stabilizer is not necessary, it is recommended that
you set the IS switch to <2>.
The camera's built-in microphone will also pick up camera operation
noise.
If the brightness changes during autoexposure movie shooting or if AF
operates during movie shooting, that part may look momentarily still
when you play back the movie.
If there is a very bright light source in the picture, the bright area may
appear black on the LCD monitor. The movie will be recorded in almost
the same way you see it on the LCD monitor.
In low light, noise or irregular colors may appear in the image. The movie
will be recorded in almost the same way you see it on the LCD monitor.
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