Sony ILCA-99M2 - Manual (Page 396)

Continuous shooting is possible for approximately 29 minutes (a product specification limit).
The continuous recordable time may differ in the following situations:
When the file format is set to MP4 (28M): Approximately 20 minutes (limited by file size
of 4 GB).
When shooting slow-motion/quick-motion movies: Recording will automatically stop
when the recorded file reaches approximately 29 minutes (the played back movie
reaches approximately 29 minutes). (Recording will automatically stop when the
recorded file reaches approximately 15 minutes if [
Record Setting] is set to
[60p/50p] and [ Frame Rate] is set to [30fps/25fps].)
The times for slow-motion/quick-motion movies are playback times, not recording times.
Note
The recordable time of movies varies because the camera is equipped with VBR (Variable Bit-Rate),
which automatically adjusts image quality depending on the shooting scene. When you record a fast-
moving subject, the image is clearer but the recordable time is shorter because more memory is
required for recording. The recordable time also varies depending on the shooting conditions, the
subject or the image quality/size settings.
The times shown are recordable times using a Sony memory card.
Notes on continuous movie recording
It requires a lot of power to perform high quality movie recording or continuous shooting. Therefore, if
you continue to shoot, the temperature inside the camera will rise, especially that of the image
sensor. In such cases, the camera will turn off automatically because the surface of the camera is
heated to a high temperature that can affect the quality of the images or the internal mechanism of
the camera.
The following values are the continuous times from when the camera starts recording until the
camera stops recording.
Ambient temperature: 20°C (68°F)
Continuous recording time for movies (HD): Approx. 29 minutes
Continuous recording time for movies (4K): Approx. 29 minutes
Ambient temperature: 30°C (86°F)
Continuous recording time for movies (HD): Approx. 29 minutes
Continuous recording time for movies (4K): Approx. 29 minutes
AVCHD 24p 17M(FH)/25p 17M(FH) 55 m 2 h 4 h 5 m 8 h 15 m
MP4 1920x1080 60p 28M/1920x1080 50p
28M
35 m 1 h 15 m 2 h 35 m 5 h 20 m
MP4 1920x1080 30p 16M/1920x1080 25p
16M
1 h 2 h 4 h 10 m 8 h 25 m
MP4 1280x720 30p 6M/1280x720 25p 6M 2 h 35 m 5 h 20 m 10 h 55 m 22 h
Only when [NTSC/PAL Selector] is set to NTSC. *