How large are the files and what encoding settings (kbps) are available? How much larger are the files vs a gopro? Especially with 4k @ 60 fps?

I have tested the Osmo Action 4 against the Hero 11. Unfortunately the Hero 11 is much more limited in frame rates and resolutions. There is no 60fps nor 30fps. You can get 50fps or 25fps. At 50fps 4k 16:9 (closest to your question), a 1min 11 second video on the Hero 11 is 0.99GB @119087kbps. The Osmo Action 4 is 597MB @63022kbps. The bitrate seems to be variable on both. You can't change the bit rate manually but obviously you can via the different frame rate and resolution combinations. At 25fps the Hero 11 is 766MB @107111 kbps versus 383MB @53426 kbps. Whilst the bitrate is double on the Hero 11 the frame rates are significantly more limited. There are more framerate options on the Osmo and they are consistent across resolutions and aspect ratios so its easier to switch. I hope this helps!

Don't laugh because I'm a fool, but is this the latest most up to date model please?

Yes it's the latest model and I recommend it. Fantastic camera love it.

Battery life at 4k 60fps? With good airflow (eg cycling)

This depends on a bunch of things including resolution, frame rate, screen brightness, whether you have the front screen on, having stabilisation on etc. I havent tested the full battery to empty at 4k 60fps but you won't get an hour. I would guess about half that

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DJI Osmo Action 4 Standard Combo - 4K/120fps Waterproof Action Camera with a 1/1.3-Inch Sensor, Stunning Low-Light Imaging, 10-bit & D-Log M Color Performance, Long-Lasting 160 Mins, Outdoor Camera | Waterproof, 1/1.3-Inch Sensor, Stunning Low-Light Imaging, 10-bit & D-Log M Color Performance,a Long-Lasting 1770 mAh Battery

DJI Osmo Action 4 Standard Combo - 4K/120fps Waterproof Action Camera with a 1/1.3-Inch Sensor, Stunning Low-Light Imaging, 10-bit & D-Log M Color Performance, Long-Lasting 160 Mins, Outdoor Camera | Waterproof, 1/1.3-Inch Sensor, Stunning Low-Light Imaging, 10-bit & D-Log M Color Performance,a Long-Lasting 1770 mAh Battery

Product ID: 544164124

Details

Brand
DJI
Connectivity technology
Bluetooth
Flash memory type
SDHC
Maximum aperture
2.8 f
Maximum focal length
24 Millimeters
Photo sensor technology
CMOS

💧Waterproof up to 18m

📸4K/120fps ultra-smooth capture

🔋160 mins battery life

Description

🎥 Own the moment, wherever life takes you!

CINEMATIC 4 K AT 120 FPS - Capture every detail with ultra-smooth slow-motion and vibrant 10-bit color depth for pro-grade footage.
ROCK STEADY STABILIZATION - Eliminate shake and vibrations with advanced 3-mode stabilization for buttery smooth videos on the move.
RUGGED WATERPROOF DESIGN - Dive, surf, or ride worry-free with IP68-rated waterproofing up to 18 meters and -20°C cold resistance.
PRE REC HIGHLIGHT MODES - Never miss a moment with pre-recording and instant highlight tagging—perfect for fast-paced adventures.
MAGNETIC QUICK RELEASE MOUNT - Switch angles and setups in seconds with a secure, innovative magnetic mounting system.

The DJI Osmo Action 4 Standard Combo is a professional-grade 4K action camera featuring a large 1/1.3-inch CMOS sensor, capable of shooting ultra-smooth 4K video at 120fps with vibrant 10-bit color and D-Log M profile. Designed for extreme conditions, it offers IP68 waterproofing up to 18 meters, robust build quality, and advanced RockSteady stabilization. With a long-lasting 160-minute battery, magnetic quick-release mounts, and smart features like Pre-Rec and Highlight modes, it’s the ultimate tool for travel, sports, and vlogging enthusiasts seeking premium footage and effortless usability.

Specifications

ASIN	B0C783YNW7
Antenna Location	Video recording in different lighting conditions, including high contrast scenarios such as sunset and sunrise.
Are Batteries Included?	Yes
Battery Average Life	160 minutes
Best Sellers Rank	672 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 4 in Action Cameras
Box Contents	Osmo Action 4 x 1, Osmo Action Anti-Slip Pad x 1, Osmo Action Curved Adhesive Base x 1, Osmo Action Extreme Battery x 1, Osmo Action Horizontal-Vertical Protective Frame x 1, Osmo Action Lens Hood x 1, Osmo Action Quick-Release Adapter Mount x 1, Osmo Locking Screw x 1, Type-C to Type-C PD Cable x 1
Brand	DJI
Brand Name	DJI
Camcorder Type	Action Camera
Colour	black
Compatible Devices	Smartphone, Personal Computer, Laptop, Tablet
Customer Reviews	4.3 out of 5 stars 4,734 Reviews
Digital Zoom	4 x
Effective Still Resolution	40 MP
Effective Video Resolution	3840 Pixels
Exposure Control Type	Manual
File Format	MP4
Flash Memory Bus Interface Type	UHS-I
Flash Memory Speed Class	Clase 10 o superior
Flash Memory Type	SDHC
Flash Memory UHS Speed Class	Clase UHS
Flash Memory Video Speed Class	V60
Flash memory type	SDHC
Focus Type	Auto Focus
Form Factor	Compact
Global Trade Identification Number	06941565965073
Has Image Stabilization	Yes
Image Aspect Ratio	16:9
Image Stabilization Type	Digital
Item Dimensions D x W x H	70D x 44W x 33H millimetres
Item Type Name	Sports and Action Video Cameras
Item Weight	145 Grams
Lens Type	Fisheye
Log Gamma Curve	D-Log M
Manufacturer	DJI
Maximum Aperture	2.8 f
Maximum Display Resolution	3648×2736
Maximum Focal Length	24 Millimeters
Maximum aperture	2.8 f
Maximum focal length	24 Millimeters
Minimum Aperture	2.8 f
Minimum Focal Length	3.3 Millimeters
Model Name	6941565965073
Model Number	6941565965073
Network Connectivity Technology	Bluetooth
Number of Batteries	1 A batteries required. (included)
Number of Speakers	1
Optical Sensor Size	1/1.3 Zoll Inches
Photo sensor technology	CMOS
Product Features	Image Stabilization
Product Warranty	DJI
Screen Size	2.25 Inches
Sensor Type	CMOS
Shooting Modes	Night, Low Light
Style Name	Standard Combo
Supported Audio Format	AAC
Supported Image Format	JPEG
Unit Count	1.0 count
Upper Temperature Rating	113 Degrees Fahrenheit
Video Capture Format	MP4
Video Capture Resolution	4K
Video capture resolution	4K
Viewing Angle	155 Degrees
Water Resistance Level	Waterproof
White Balance Settings	Auto
Wireless Compability	802.11abg, Bluetooth
Zoom	Digitaal

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