I know it is probably better to reduce noise in post e.g. Neat Video but where are the settings in camera on the Sony A7s?? I own a Panasonic GH4 as well and the settings are very easy to find in the picture profiles.
That option is only for STILL images and not video as per the manual ..see below:
Interchangeable Lens Digital Camera
ILCE-7/ILCE-7R
High ISO NR (still image)
When shooting with high ISO sensitivity, the product reduces noise that becomes more noticeable when the
product sensitivity is high. A message may be displayed during noise reduction processing; you cannot shoot
another image until the message disappears.
1
.
MENU
→
(Camera Settings)
→
[
High ISO NR]
→ desired setting.
Menu item details
Normal
(default setting):
Activates high ISO noise reduction normally.
Low:
Activates high ISO noise reduction moderately. Select this to prioritize the timing of shooting.
Off:
Does not activate high ISO noise reduction