If your server (like PhotoPrism) struggles to play these files, the culprit is often . Users with older CPUs (10th gen and earlier) have reported that newer drivers no longer support QSV for certain MP4 configurations.

: They often hover awkwardly above the "black bars" instead of overlaying them, making for a distracting viewing experience. 2. Hardware Acceleration and Transcoding Fails

Are you experiencing a different issue with your MP4 library? Let us know in the comments below!