SOLVED: All new videos won't play anymore

[Manly Manlison]

For some reason, every since yesterday, anything I add to the server from this point on won't play at all on my phone (with some MediaCodecVideoRenderer error) and on any other devices it forces the media to transcode, when it is 100% supposed to be able to direct play it (h265 mkv 10bit ac3 videos through jellyfin media player and the android jellyfin app)

The weird thing is that my whole library prior to yesterday is still able to direct play properly with no issues, but just not the new media.

I tried disabling transcoding on my user and disabling hardware encoding, then I started getting remuxing logs instead.
Can someone help me understand these remux and transcode logs please?

[Manly Manlison]

I'd like to add that I recently added a new 4TB HDD to my PC because I only had like 100GB left on my jf drive, and since I ran out of SATA slots I'm using a PCIe card to run the disk, and I've extended my JF drive with this disk. It almost seems like everything being thrown into this new disk is unable to play properly on Jellyfin.

The drive is showing no errors and I can run all the videos locally just fine though, as well as download the videos to an external client fine and play them directly on that device with no faults :s

[Manly Manlison]

UPDATE:
I found a thread with a dude who said pointed me in a somewhat right direction. At first I thought it was a ffmpeg.exe issue, so I downloaded the latest one and pointed Jellyfin to the new executable but that did not fix anything. But through this random thread, I could see it seems that you also need to place ffprobe.exe in the same folder as ffmpeg.exe or it will throw errors. I did that and now some videos start playing that couldn't before, while some still are hanging, but it seems like more and more of my media is being able to direct play now! Let's see what happens.

UPDATE 2:
Yup, it seems like I was having some ffmpeg issues, and what I thought would fix it (adding a path to ffmpeg.exe in JF) was not enough - After also adding ffprobe.exe in the same folder as ffmpeg.exe, everything seems to work correctly again.

Which brings me back to my initial confusion, what happened to the original ffmpeg and why did it stop working?