If you have tried all the above and still see "media-err-decode 7 plus," a factory reset is your final option. This should only be done if the error appears in essential apps like the Camera or Phone dialer.
After reboot, your phone will rebuild the media database. This can take 5–10 minutes. Once done, test a video. media-err-decode 7 plus
This is the scariest part of the phrase. In computing, "media" refers to the physical or virtual storage medium—your SSD, NVMe drive, HDD, or even a USB controller. An "err" here usually indicates that the system tried to read data from the disk, but the disk replied with gibberish or nothing at all. If you have tried all the above and
Open your case. Unplug the data cable from your drive. Blow out the dust. Do not use the same cable. Swap it with a known working cable from your DVD drive (if you have one). SATA cables are notorious for "partial failure"—they pass power but fail at decode. This can take 5–10 minutes
While this error can occur on any iOS device, it has become notably prevalent on the due to specific hardware and software aging factors.