Camera previews and video clips: which to choose

Start with the still

A still image is a good first choice when the question concerns arrangement. You can inspect the line of a road, where a building meets the pavement or how a junction is framed without asking a clip to do more than it needs to. Begin with the lightest useful view, then move to video only when movement changes the answer.

“Lightest” here is a decision principle, not a measured claim about this site’s file sizes. A configured still request can still fail, and a successful image may be unsuitable for fine detail. Use the image that actually appears, and describe only what its frame supports.

Westminster Bridge, Piccadilly Circus and Brompton Road are separate camera entries. Their names can help you choose a starting place; they do not verify the exact crop or promise current conditions. Inspect the frame before deciding it covers your feature.

Load a clip for movement

Choose a clip when you need to follow motion through the sequence supplied, such as noticing which direction vehicles travel within that recorded segment. A clip offers changing frames; it does not create continuous observation between them or establish when they were recorded.

On this site, the video source is held back until you deliberately press Play. That keeps the initial page focused on the still and lets you choose whether motion is worth requesting. Pressing Play establishes intent to load video, not that playback will succeed or that the footage is current.

A browser must support the media format and receive a usable resource. The HTML video element provides the playback interface; a container such as MP4 or WebM is a package for media streams, while codecs define how those streams are encoded. The MDN container guide explains the distinction.

Do not assume extra detail

The clip’s dependable difference is motion, if it plays. This site has not verified that video has greater resolution or makes small lettering clearer than the corresponding still. Do not load it expecting number plates, shop signs or other fine detail to become legible.

Likewise, do not infer that a still and clip are simultaneous versions of one exposure. They may have different capture and delivery histories. A familiar building can help you recognise a place, but it does not establish a shared capture time.

Video is a longer sequence of encoded data than a single still, but its size depends on duration, encoding and other file choices. This site has not measured a fixed size ratio between its stills and clips. On a limited connection, choosing a still first avoids requesting motion you may not need; it is not a calculation of how much data a particular view will use.

Use a source designed for the detail you need. For current journey conditions, turn to current transport information. For a building name, consult an authoritative map or the building’s own information rather than sharpening a distant frame.

One camera has no configured source

Oxford Circus has no still source configured in this site’s camera data, so it is not an example of a working still-and-clip pair. A missing source is different from a configured image failing during a request. Nearby cameras such as Piccadilly Circus may be useful for a different view, but must keep their own place names.

If the still fails while a source is configured, one retry can tell you whether the display succeeds on another attempt. It will not prove a cause. If the clip fails, check the message and return to the still or another available view rather than repeatedly requesting the same resource.

Decide what you need before you press Play. For fixed layout, use a still if available. For motion, choose a clip with the understanding that it is a supplied sequence, not a live guarantee.