> I was wondering where this product was, and/or why some of the podcasts I listen to don't use something like this.

These are called "multi-enders", and lots of podcasts do them. There are many[1] tools for this which are focused specifically on podcasters.

Additionally, it's straightforward to do it manually as well. (Tip: Have participants on all ends do a "1-2-3 <CLAP>" to make it easy to align the audio during production. Do this at the beginning and end to account for digital clock drift.)

[1] Cast: https://tryca.st/ [2] Cleanfeed: https://cleanfeed.net/ [3] Ringr: https://www.ringr.com/ [4] Zencastr: https://zencastr.com/

Then I'll just say I'm surprised more shows don't do it.

Me too!

Most of the higher production value podcasts I listen to with remote hosts/guests do this, albeit manually (ie record locally with something like Audacity, sync on a click/clap, recorded live call as a backup). This feels like a nice improvement to streamline an otherwise cumbersome process.

haha we are asking the same question!

We have an uploader system. So if they quit too soon, you can always send them a link so they can finish the uploading.

Where does the video save? I guess I didn't know a browser could just record video and save it somewhere.

We store unuploaded chunks of the video in IndexDB in a browser. Btw if plan to do something similar beware of the fact that storing a lot of blob references in IndexDB can cause some wired issues in Chrome a some blobs can get corrupted. Our workaround is to store it as byte arrays.

Video is saved as a binary blob in some kind of storage. In our case that would be IndexedDB. But since the data is uploaded in parallel with the call there is only few hundred MB used at any give moment.

Generally browsers will let you store a few GB of data (depending on the user free space) if your really wanted to but it's not recommended since they can delete it any time.