[Feature] Add ability to stream play video and audio files and image previews

[kovalensky]

It would be nice if media files that are being downloaded could play with in-built player.

Almost every cloud storage provides ability to range download, so there's not a big problem.
And as I committed in another request, please add optional setting to enable creating encrypted image/video previews for media file uploads.

I suggest that every media file that is being uploaded should contain preview block (encrypted of course) in the start of content, and if possible it should be with user's predefined quality settings.

When user opens a folder containing media files for the first time, on PC or Android, Cryptomator starts to download predetermined media files, when it gets to the end part of block containing thumbnail - it stops, shows thumbnail of file, saves preview in local cache for faster user experience.

If user wants to download a media file, Cryptomator just ignores/deletes thumbnail block and saves original file.

With these abilities Cryptomator would be perfect and user-friendly.
Cheers!! ❤️🏆🥇🧠

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[SailReal]

In the long term, we will switch to cloud-access-java, which will make it possible to stream the encrypted files from the cloud. But that is all up in the air. We are currently working on vault format 8, which decouples the key derivation from vault decryption, which in turn makes something like 2FA possible. Next, we see the document provider as priority 0, which will also take up some time. So unfortunately nothing really new here, but we definitely see the need.

[toutoumu]

When browsing files, do not perform any disk write operations, and clean up the memory when the application exits, so that it can be truly safe.