A deliberately tiny, free, ad-free, open-source video player whose only job is
to play videos and reliably jump to the next / previous video in the same
folder, including folders that mix .mp4 and .mkv files.

It is built on Android's modern media stack (AndroidX Media3 / ExoPlayer). Every
video in the chosen folder is added to one playlist, so the next / previous
buttons just work across mixed .mp4 + .mkv content; a broken or unsupported file
is skipped instead of freezing playback.

Features:

* Reliable next / previous across a whole folder, regardless of .mp4 vs .mkv.
* Double-tap the right or left side to seek forward / backward; the step grows
with consecutive taps and is capped relative to the video length.
* Rotation button that can force landscape, force portrait, or follow the
sensor even when the system rotation lock is on (like YouTube and VLC).
* Optional all-files access (this F-Droid build) so opening any video from any
file manager lets next / previous work through the whole folder, including
hidden folders that the media scanner ignores. If you decline the permission,
the app falls back to the Storage Access Framework folder picker.

No ads, no tracking, no analytics. Plays video only: no audio-player mode, no
image viewer. Released under the MIT license.