I did some research on this and it looks like a U-8 cable to me. Seems like it was popular with digital camera back in the day and I think I even have one kicking around somewhere. If you look there are 8 pins in that connector which would rule out FireWire and standard USB 2.0 connectors. I think this device is likely too old to have HDMI and from what I’ve seen it can actually output composite video from the 3.5 mm jack. Check out U-8 and you might even be able to find a 3.5 mm jack to composite cable that works for video out.

Update: we've found the barrel connector plug for it, so we can charge it, though i'll get a new battery, thats been sitting in a cupboard for around 14 years or so

ITT: So many confidently incorrect comments

That looks proprietary.

A lot of companies back in the mid-2000s would take a USB cable and make a custom head.

This meant that you always had to go through the manufacturer to get a replacement. It would ensure that the cable would always meet spec, but it also meant that no one could make cheaper replacements.

This ebay listing has a picture of the box and that says USB 2.0.

It's not USB mini-B as you found, nor normal USB B, for that it's too small. Nor is it Firewire like many here claim for some reason when the shape is clearly off. Mini HDMI and Micro HDMI are too new, so that's also a bad suggestion.

I think it's probably the proprietary 8-pin mini USB originally by Nikon, also known as UC E6

Man the only good trend in modern tech is the homogenization of cables. Huntington down proprietary single use cables that are usually just for charging is such a fucking nightmare. Woe to anyone with a device that relies on FireWire.

(And it’s not even a new trend—looking at you: 1/4inch plug 😒)

Better Flash-shot down the port

Side by side

i think i found it: https://pinoutguide.com/DigitalCameras/micro_usb_8pin_camera_pinout.shtml

non standard micro usb 8pin, check the site if your camcorder is on that list

it also kinda looks like a 8 pin variant of the usb mini a-b connector,

Prolly custom but it does look similar to this cable I got from a Panasonic DMC-FZ18

maybe Firewire. That was the high speed wire back in the day, popular with video production and MacOS.

This is the only cable I have that I THINK is a Mini B, but as I say its too big for the port

Looks like micro HDMI to me.

Mini DisplayPort?

Its probably FireWire. Old camcorders used that. Listen to the other comment mentioning FireWire 400.

There having a clear out

FireWire 400

Edit: for all of you kids out there, fire wire 400 came out around the same time USB 2.0, but it was faster superior. FireWire 400 (400 Mb/s)became FireWire 800 (800Mb/s), which eventually became thunderbolt (10Gb/s). Then thunderbolt 2 (20 Gb/s), thunderbolt 3 (40 Gb/s), thunderbolt 4 (40Gb/s + PCIe 32Gb/s), thunderbolt 5 (80Gb/s with 120Gb/s boost), all over a standard USB-C connection.

That’s 4x faster than a USB 3.2 connection, and 8x faster than a USB 3.0 connection. that’s 250x faster than a USB 2.0 connection.

Thanks to Apple, Sony, and Intel

(For reference, DDR5 RAM can only read/write at just over 51 GB/s)

Thunderbolt 6 is in the works

While we're at it - what kind of USB is this one on my old digicam from ~2003? Anyone?

I believe that's a USB Mini-B port, but the perspective is messing with me. Can you share a further out photo or use a banana for scale? This photo makes it seem huge.