Facebook video quality, sound and common download problems
Understand resolution
Dimensions such as 720 × 1280 describe the output frame size. HD, 2K or 4K are available only when the source provides that version. Platform compression and original recording quality still affect clarity.
A failure is not always a bad link
A post may have been removed, changed visibility, become restricted or contain no video. The queue can also be temporarily busy. Check the source and retry later; repeated requests can trigger abuse limits.
Preserve creator rights
Downloading does not give permission to remove attribution, repost or advertise with the video. Use it only within the rights granted by the owner or law. If a result affects your rights, use the Copyright page to request a review.