Mailru serves its media as MP3, MP4, and that is exactly what you keep. The container is passed through rather than rebuilt, so there is no generation loss between what Mailru stored and what ends up in your downloads folder. The extractor covers 3 separate Mailru URL shapes, so a link copied from anywhere on the site usually resolves as-is. Mailru is handled by the media route, which reads the site's own rendition list before choosing anything. A typical Mailru item runs a few minutes.
Shortcut — stick tikt.com/ on the front of the Mailru address instead of copying it here:
tikt.com/https://www.example.com/path/to/media
Three steps, start to finish
1. Copy the Mailru link
Use the address bar or the platform's own share button — both give a URL the extractor recognises. Point it at the single item you want, not the page around it.
2. Let it read the renditions
Paste the URL above. The extractor asks Mailru which renditions exist for that item and picks the best progressive one rather than assuming a quality.
3. Save what comes back
The file arrives in the container Mailru served it in, and the extractor does not rebuild it — so what you end up with is what the uploader encoded, for better or worse.