Vix.com offers many channels to stream totally free in the US and much of South America, they're all listed here. No account required.

https://vix.com/es-es/canales

I was attempting to capture one last night and whilst I had no troubles with decrypting the DRM afterwards with my CDM I struggled to actually download the m4s chunks continuously for the full 2hr30 I required.

As you can see there is the usual MPD file, which I passed to N_m3u8DL-RE:

Code:
N_m3u8DL-RE "MPD" --live-real-time-merge --save-name "ViX"
I run into two different issues. Firstly, the video stream download after 5-10 minutes would just stop, whilst the audio continued. I started with the 1080p, down to 480p, kept doing it.

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[Attachment 89717 - Click to enlarge]

When it didn't do that It gets to around 17 minutes and then I get a 403. I assume this is because the MPD "expired". I notice in Dev Tools a new MPD is downloaded by the browser every few seconds.

I tried a few different options in N_m3u8 but none seem to help. I suppose one workaround for the latter issue is to start a new capture after 15 minutes or so, keep the chunks and put them together manually afterwards removing any overlaps.

Or is there any solution to get a long continous download on this site from a livestream with DRM? Which, again to be clear, I had no problems with. What I did manage to download I decrypted just fine.