Wallper 1.0.4: Your Own Imported Videos Now Survive a Restart

Videos you import as live wallpapers stay in your library across restarts. Wallper rescans its video folder on launch and restores anything missing.
Wallper ships with a large library, and plenty of people never look outside it. But a good number of users arrive with something specific in mind: footage they shot, a render they made, a clip from a game, a loop a friend sent them.
In 1.0.3 and earlier, importing that file worked perfectly right up until you quit the app.
Reopen Wallper and it was gone from the library. The file was still on disk, untouched, sitting exactly where it had been put. The app had simply lost track of it, so as far as the interface was concerned it had never been imported. The only way back was to import it again, which worked, until the next restart.
What 1.0.4 Fixes
On every launch, Wallper now rescans its own video folder at ~/Library/Application Support/Wallper/Videos and reinjects anything that is present on disk but missing from the library.
The practical result is that import, quit, reopen and apply now works the way you would expect it to. Nothing to rebuild, nothing to re-import, no reason to think about where the file went.
The underlying mistake was treating the library index as the source of truth and the folder as a side effect. It is the other way around. The files on disk are what you actually have, and the index is a convenience built from them. Once the index is rebuilt from the folder rather than trusted over it, the whole class of problem disappears.
Using Your Own Video as a Live Wallpaper
Custom footage behaves a little differently from the curated library, and a few things are worth knowing.
Length matters more than resolution. A wallpaper is seen in glimpses hundreds of times a day, so a clean twenty second loop nearly always beats a two minute clip with a visible restart. If the first and last frames do not match, you will notice the jump, and then you will keep noticing it.
Movement matters more than detail. Footage that works beautifully in a video player can be exhausting behind a desktop full of windows. Slow drift, gentle parallax and soft lighting changes hold up. Fast cuts and camera shake do not.
Resolution should match your display rather than exceed it. A 4K file on a 4K panel is right. An 8K source is a larger file being scaled down every frame for no visible benefit.
There is more on this in setting a video as a live wallpaper on Mac, plus supported file formats and using custom wallpapers from YouTube in the FAQ.
If You Made Something Good
Imported wallpapers are private by default. They live on your Mac and go no further.
If you have made something you think others would use, Wallper has a publishing flow: upload it, and it can appear in the shared wallpaper library with your name attached. Creator credit landed a few days after this release in 1.0.7.
The upload page covers how it works, and can I upload my own wallpapers answers the usual questions about rights and formats.


