Compare VLC deinterlacing on a suitable interlaced source

Identify the visible artefact

Look for comb-like horizontal separation around moving edges on a suitable source. Pause and compare several frames, recognising that a still photograph can hide motion behaviour. General softness, compression blocks and a repeated frozen frame are different symptoms.

Use media you are entitled to inspect and preserve the original. A programme's age or country does not prove it is interlaced; supplied metadata and the actual picture are better evidence.

Record the existing player state

VideoLAN's desktop 3.0 video documentation describes deinterlacing controls and several methods. Note the currently selected state and method. Exact menus can differ by platform and build, so use the installed app's relevant Video controls.

Keep aspect, crop and sharpening unchanged for the initial comparison. Multiple filters can change the same moving edge in ways that are difficult to separate.

Compare motion as well as a frame

Enable a documented appropriate option and replay the same moving passage. Check combing, fine detail and perceived motion. A method can trade one artefact for another; a sharper paused frame is not the only criterion.

If the source is progressive or the player already handles it appropriately, forcing a deinterlace method may offer no benefit. Restore the prior state if the comparison is unhelpful.

Report the actual conditions

Include the source scan information where known, player version, chosen method and visible change. If the problem occurs only after a seek or only on one source, retain that scope. Do not describe every form of stutter as interlacing.

Check a normal progressive reference afterward to ensure a persistent preference does not worsen ordinary viewing. This workflow does not certify a broadcaster's source, prescribe one universal filter or claim a physical VLC performance test. It is a controlled player comparison for a specific picture structure.

Avoid a frozen-frame-only verdict

Replay the reference at normal speed after examining a paused frame. Some methods trade vertical detail against motion treatment, and the actual viewing task includes both. Keep the chosen method and source scan information with the result. If the artefact disappears only because the picture was scaled down, note that separate change rather than attributing it to the filter.