Is there any easy way that I could screen capture an Apple device so I could run a timer on this?

If you have access to a computer that is able to run an app called WonderShare MirrorGo and are able to connect a USB cable to both then that is one way. You can either capture the timer separately or with the MirrorGo window that will appear using OBS. That actually isn't what I think would be considered simple but that is what I found to be the best way for quality recordings, so far. If this doesn't work then you could try to find some posts that might help. Other than that I am afraid I am of no help, as I run an android. This might help but I am still ill-informed on the situation of iPhones so it might not. https://filmora.wondershare.com/screen-recorder/best-ios-screen-recorder.html#:~:text=Best%20iPad%20and%20iPhone%20Screen%20Recorder%20Apps.%201,4.%20Dr.%20Fone%3A%205%205.%20CoolPixel%3A%20More%20items

I just tried some stuff and I'm pretty sure I have an OK method of recording the screen (with audio). Note, this might not be easy (but it certainly works for me) Pros: It works on Mac! Cons: Somewhat noticeable audio latency (mitigation: OBS delay filter on screen, potential reason: quicktime), only works for Macs, somewhat messy, you won't hear the audio from your iPhone (audio will be recorded), everything will start to heat up

Prerequisites: Beefy Mac computer (handle recording in OBS), OBS, working iPhone screen capture in OBS, BlackHole audio driver, and QuickTime Player for iPhone audio capture My case: M1 Macbook Pro, iPhone X, capturing at 1920x1080 (top and bottom cropped by 96 pixels to remove black bar, resulting in 1920x888 which only works for landscape orientation)

You will have to install BlackHole audio driver. Refer to https://github.com/ExistentialAudio/BlackHole#option-2-install-via-homebrew (if you don't have homebrew, see https://brew.sh/ for install instructions. using this method to avoid giving personal information)

1. Connect your iPhone to your Mac using the charger for your iPhone (if the cable is charge only, get another cable), tap Trust on your iPhone when it prompts and enter your password if needed.
2. Open OBS, create a new Video Capture source and choose <Your iPhone Name>.
3. Open QuickTime Player, find the "File" drop down menu, and click on "New Audio Recording" (shortcut: Command-Shift-N). A window will show up. Find the record button and open the drop down button to the right of the record button. Select <Your iPhone Name> as the Microphone. Find the record button again, and below, there will be a volume slider. Slide it to max. You should start hearing your iPhone output sound (if there is any sound to output). You won't need to start recording in QuickTime Player.
4. Change your Mac sound output to BlackHole audio driver (also make sure there is no other apps that'll make audible noises, cause that'll be included)
5. Return to OBS, create a new source for Audio Output Capture, and choose BlackHole 2ch (or 16ch if you got the one with 16 channels)

And with that, test record, revert the Macs audio settings (so you can hear again), and review the footage to check if things are working.

To crop black bars (if any):

1. Turn your iPhone to your preferred recording orientation (landscape for Deemo obviously), and make sure that the screen is completely filled up with a color that's has contrast between black (Deemo song picker works).
2. Return to OBS, right click the Video Capture source, hover over the Transform menu and click on "Edit Transform..." in the new menu. This should open up a window called "Scene Item Transform" (OBS version 27.0.1). At the bottom of the new window, you'll see Crop for Left, Right, Top, and Bottom. 2.1. Below the size, there should be "Positional Alignment". Change that to "Top Left" (if you don't, cropping will have weird behavior) 2.2. Change "Bounding Box Type" to "Scale to inner bounds"

2.3. In the main window of OBS, right click the preview and click "Screenshot (Preview)" 2.4. Open the screenshot made by OBS (in output folder) in an image editor like GIMP (or anything else, just need to be able to zoom in on the image and select at image pixel precise level), select the black bar (entire not required) and get the number of pixels in width or height (height is for top/bottom, width is for left/right) 2.5. Go back to editing the transform again, and add/remove any amount of pixels to the cropping. 2.6. Change the bounding box size accordingly (width = width - left crop - right crop, height = height - top crop - bottom crop), and close the window.

If not obvious, you will only be able to correctly record in the orientation you chose to do while following the cropping instructions.

Hopefully I was able to help anyone out there.

If your iphone version is iOS 11 or above, then there is an in-built screen recording feature. Just turn on this features and then record your screen according to the prompts. https://www.dvdfab.cn/resource/video/how-to-screen-record-on-iphone

There is an built-in screen recording feature for iphone.

Here is the referenc for you if you need it

https://dvdfab.fr/resource/video/how-to-compress-a-video-on-iphone

Screen recording seems unable to restore the original quality of the video. I had a deep experience when I make a DVD of these videos. https://www.dvdfab.cn/tips/how-to-make-your-own-dvd-disc.htm

Screen recording can be time-consuming. I want to record my DVDs to have them in digital format. While screen recording is an option, ripping the DVDs directly to a digital format can be a more efficient method. For example, https://www.dvdfab.cn/resource/dvd/dvd-to-avi

You can easily screen capture an Apple device by using the built-in screenshot feature. But like others have said screen recording can be very time consuming. I'd rather use DVDS and have my DVDs into MP4. Maybe this article can help you, https://dvdfab.at/resource/dvd/top-free-dvd-ripper.