Does an offline player need internet permission?

It can need network access for separate functions such as diagnostics, purchases, update checks, support or a URL you explicitly open. Local playback itself should not upload your media.

Why does an MKV file open on one phone but not another?

MKV is a container. The codec, profile, audio format, resolution and the phone's hardware or software decoder determine actual playback support.

Can video keep playing in another app?

On supported devices, Picture-in-Picture keeps video visible and background playback can continue audio. Operating-system settings may affect both.

How to choose an offline video player

Offline should mean local by default

A local player should not need an account or a remote catalogue to open your own file. Vidorec opens only media you select and does not upload the video, file name, file path or subtitle text during normal playback. Recent items, favourites, positions and playback preferences stay on the device.

An app may still use the network for clearly separate operations such as crash diagnostics, purchases, update checks or a support report you choose to send. The privacy policy should distinguish those operations from media playback instead of calling the entire app offline without explanation.

Controls that matter during a real viewing session

Picture-in-Picture keeps a supported video visible above other apps. Background playback and system media controls let audio continue when the app is not foregrounded. Subtitle selection, timing, appearance and audio-track switching matter for films, lessons and multilingual media.

Vidorec's signature pan-and-zoom interaction keeps playback moving while you inspect a part of the frame. Pinch toward the point you want to examine, drag after zooming and reset without leaving the player. Button and slider alternatives support viewers who do not want to rely only on gestures.

Format support is not just a file extension

MP4, MKV and WebM are containers. H.264, HEVC, VP9 and AV1 are video codecs inside a container. A device can recognize the container but lack a decoder for the stream, profile, bit depth, resolution or HDR format inside it. That is why a trustworthy player reports what the device says instead of promising that every file will play everywhere.

Check both the container and the video/audio codec.
Hardware decoder capability varies by Android version and manufacturer.
4K and HDR also depend on the display, profile and media source.
A different audio track or an audio-only fallback can still be useful when video is unsupported.

A five-minute player test

Open one short file and one long file that represent your library. Seek near the end, change orientation, select a subtitle, enter Picture-in-Picture and return to the app. Reopen the same file and confirm resume position. If a file fails, look for a specific container or codec explanation before converting it.