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Quality & resolution, explained

Sharpness is not one number. Resolution, bitrate, frame rate and colour each set a ceiling, and the lowest ceiling is what viewers see.

Picture quality comes from four things: pixel count (resolution), bits spent per second (bitrate), frames per second (motion) and the range of brightness and colour (SDR or HDR). A host re-encodes your file into a ladder of versions. So the quality you upload sets the ceiling for all of them.

VideoBB Platform Desk · 5 guides · Updated · Editorial policy
Abstract illustration of a frame divided into progressively finer grids from left to right, with a gradient of brightness across it.

Guides in this hub

  1. Comparison4K vs 1440p vs 1080pFour times the pixels is not four times the sharpness. What each resolution costs to upload, encode and stream, and when a viewer can tell the difference.8 min readRead
  2. ExplainerVideo bitrate guideBitrate is the budget an encoder spends on every second of picture. Here is how to read it, how to set it, and how much to give a file before you upload.9 min readRead
  3. ExplainerFrame rate: 24, 30 or 60 fps?Frame rate sets how motion feels and how many pictures the encoder has to pay for. The right number depends on what you shot, not on what sounds highest.8 min readRead
  4. TroubleshootingWhy your video looks blurry after uploadIt looked sharp on your desktop and soft on the page. Usually the player is still climbing, the renditions are still cooking, or the source was never as good as it seemed.9 min readRead
  5. ExplainerHDR video basicsHigh dynamic range stores brighter highlights, deeper shadows and more colours than standard video. It only looks that way when every link in the chain agrees.8 min readRead

Two videos can both be labelled 1080p and look nothing alike. One was exported at a generous bitrate from a clean camera file. The other was screen-recorded at a low bitrate, upscaled from 720p, and re-encoded twice on the way to the upload form. The label only describes the grid of pixels. It says nothing about how many bits filled that grid, how smoothly it moves, or whether the colours suit the screen.

This hub takes quality apart into the four things that decide it. It follows each one through upload, encoding and playback. The five guides compare 4K, 1440p and 1080p honestly and explain bitrate in numbers you can use. They settle the 24, 30 or 60 frames question, explain why a video can look worse after upload, and introduce HDR without the marketing.

Four dials, one ceiling

Four settings decide how good a video looks, and the lowest one sets the limit. They also depend on each other. Change one, and the others feel it.

Resolution: how many pixels

Resolution is the number of pixels in each frame. 1080p is 1920 by 1080 pixels, and 4K UHD is 3840 by 2160. More pixels need more bits. Raise the resolution without raising the bitrate, and each pixel gets fewer bits. That is why a 4K file at a 1080p bitrate can look softer than a good 1080p file. The 4K vs 1440p vs 1080p comparison shows when the extra pixels are worth it.

Bitrate: how many bits per second

Bitrate is how many bits per second the encoder may spend describing the picture. It is the budget behind everything else. Too few bits, and fine detail turns to blur and blocks. The bitrate guide turns this into numbers for 1080p and 4K uploads.

Frame rate: how many pictures per second

Frame rate is how many frames arrive each second. Double it, and the encoder must describe twice as many frames with the same budget. The frame rate guide explains when 60 fps is worth that cost and when 24 or 30 fps looks better.

Dynamic range: how bright and how colourful

Dynamic range is the span of brightness and colour each pixel can show. Standard video (SDR) uses eight bits per sample. HDR needs ten bits and a screen that understands it. The HDR basics guide explains why HDR often looks grey on the wrong screen.

What happens to your file after upload

Every hosting platform, VideoBB included, re-encodes uploads into a fixed ladder of versions called renditions. That lets adaptive streaming pick the right one for each viewer. Your file is the top of that ladder.

VideoBB's encoding ladder

Target video bitrates for each rendition, H.264. Audio is encoded separately. Renditions above 1080p are made when the source is large enough, and only Premium viewers can watch them.

RenditionFrame sizeTarget video kbpsAvailable to
2160p3840×216016000Premium
1440p2560×14409000Premium
1080p1920×10805000Everyone
720p1280×7202800Everyone
480p854×4801400Everyone
360p640×360800Everyone
240p426×240400Everyone
144p256×144200Everyone

From upload to playback

After the upload completes, the file is checked and passed to the transcoder. The transcoder decodes it once. It encodes each rendition in the ladder at or below the source resolution. A 1080p source makes 1080p down to 144p. A 4K source makes 2160p down to 144p.

Each rendition is cut into short segments and listed in an HLS playlist. The player's automatic quality setting chooses between them as the viewer's bandwidth and screen allow. The quality levels help page shows how Auto and the gear menu work. Thumbnails and scrub previews are made in the same process. The transcoding guide follows it step by step. How the player then behaves inside your own web page is covered in the player and embedding guides.

Why the source matters most

Whatever your file lacks, the renditions lack too. Whatever extra detail it has makes them better. The ladder's bitrates are fixed, so the way to get a better 1080p rendition is to give the encoder a better source. You are not choosing the output. You are choosing the input. The preparation guide turns that into export settings. If a video already looks soft, the blurry after upload guide walks through the checks.

Rules of thumb worth memorising

These are working guides, not laws. Each article explains where they break down.

  • Upload at roughly twice the bitrate of the top rendition you expect the host to make. That is around 10 Mbps for 1080p, and 30 Mbps or more for 4K.
  • A 4K rendition costs about three times the bitrate of 1080p. It is visible only on large screens or up close. A 4K source still improves the 1080p rendition.
  • If a long 4K master will not fit in 4 GB, make a high-bitrate 1080p copy with the free resize tool and upload that.
  • Keep your master at full quality. Use the video compressor only for a smaller copy to share, not for the file you upload.
  • Keep the frame rate you shot at. Converting 24 to 30 or 30 to 60 adds judder or duplicate frames without adding information.
  • Use a constant frame rate before upload. Variable frame rate from phones and screen recorders is the most common cause of audio drift.
  • If the picture looks soft, check the player's quality menu before blaming the file. Adaptive streaming starts low and climbs.

Frequently asked questions

Why does my 1080p upload look worse on VideoBB than on my computer?

There are three usual reasons. Adaptive streaming may still be at a lower rendition when you look, so open the quality menu and choose 1080p. The renditions may still be processing shortly after upload. Or the source had a low bitrate to begin with. Then the 1080p rendition at 5,000 kbps is a faithful copy of a soft file. The blurry-after-upload guide walks through the checks.

Is it worth uploading 4K if most of my viewers do not have Premium?

Often, yes. Viewers without Premium receive up to 1080p. But a 1080p rendition made from a 4K source is usually sharper and cleaner than one made from a 1080p source. The encoder is working from more detail. The cost is a larger upload. At 4 GB per file, you have room for a good 4K master of a short or medium-length video.

Does higher bitrate always mean better quality?

Only up to a point, and the content sets that point. Past it, extra bits go to noise nobody can see and make the file slower to upload. A static talking head reaches that point early. Sport, confetti and film grain keep benefiting for much longer. The bitrate guide gives targets by resolution and explains what eats bits.

Should I shoot 60 fps for everything?

No. 60 fps suits gameplay, sport, screen recordings with fast cursor movement and anything where smooth motion is the point. For interviews, talks and stories, 24, 25 or 30 fps looks natural. It also leaves more bitrate for each frame. Whatever you choose, keep it constant and match it in the export.

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