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Picture, sound & accessibility guides
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Picture, sound & accessibility guides
8K versus 4K: what the extra pixels actually changeWhy your TV says 4K when a channel is HDHow viewing distance changes visible streaming detailWhat TV upscaling can improve—and what it cannotBitrate versus resolution: why a smaller picture can look cleanerHow to calculate video pixel counts without confusing width and heightScreen size and resolution: two specifications that answer different questions720 p versus 1080 i for live sport: motion matters tooNative resolution versus fixed output on a streaming boxHardware versus software decoding: choosing a player settingH.264 versus HEVC: what viewers need to knowAV1, HEVC and VP9: understanding playback supportCodec versus container: why file extensions do not tell the whole storyMP4 and MPEG-TS: why streams use different containersVideo profiles and levels: the hidden limits behind a codec name8-bit versus 10-bit video: colour steps and compatibility4:2:0, 4:2:2 and 4:4:4: when colour sampling mattersKeyframes and channel changes: why a picture may take a moment to appearVariable frame rate: why timestamps matter more than a single FPS labelFPS versus Hz: the difference between a programme and a displayWhy 24 fps films can judder on a 60Hz output25 fps and 50Hz: a useful pairing for television motion50 fps versus 60 fps sport: what actually affects the viewing experienceWhy frame-rate matching causes a brief black screenMotion interpolation: smoother movement with a trade-offThe soap-opera effect: restoring a film’s familiar motionBlack-frame insertion: clearer motion, darker pictures and possible flickerStutter or buffering? Two playback faults that need different checksDropped frames: finding a local playback bottleneckTV motion ratings versus real panel refresh ratesHDR versus SDR: brightness range is separate from resolutionHDR10, Dolby Vision and HLG: different formats, one compatibility questionHLG and live television: understanding an HDR signalHDR tone mapping: fitting a bright master to your screenWashed-out HDR: checking the format before adjusting colourDark HDR pictures: balancing room light and display settingsSDR video on an HDR desktop: why brightness can changeHDR metadata and on-screen badges: useful clues with limitsPicture edges missing? Check overscan before changing the streamWhy films have black bars on a widescreen TVWhy stretch mode makes faces look wrongAnamorphic video: when stored pixels are not squareStreaming on an ultrawide monitor: choosing fit without losing captionsPortrait video on a TV: why side bars preserve the pictureFit, fill and zoom: picking the right video sizing controlSubtitles outside the screen: separating positioning from croppingPixel aspect ratio: a small number with a visible effectBlack bars inside the video or added by the player?Choosing an HDMI cable for a streaming setupEnhanced HDMI input settings: why the correct port mattersA black screen on protected video: checking the HDMI pathWhen an AV receiver limits the picture reaching your televisionEDID: how a player learns what a display acceptsUnsupported display mode: recovering a picture safelyIntermittent HDMI picture: finding the point where the signal dropsRGB full versus limited: matching black levels across devicesRGB versus YCbCr: choosing a compatible video outputPicture but no HDMI sound: checking the selected audio pathPCM versus bitstream: deciding which device decodes the soundAudio passthrough: when letting the receiver decode makes senseStereo and surround streams: matching the sound to your speakersAAC, AC-3 and E-AC-3: why one audio track may be silentAn Atmos badge does not describe every sound pathARC versus eARC: returning television sound to a soundbarOptical versus HDMI audio: choosing the connection your equipment supportsLip sync that stays wrong: adjusting a constant audio delayAudio drift that grows: why a fixed delay is not enoughBluetooth headphones and video delay: finding a workable viewing routeHearing two voices at once: duplicate audio or a mixed track?Audio language and subtitle language are separate choicesAudio description: choosing narration of visual actionQuiet dialogue and loud effects: checking the mix and speakersNight mode and dynamic-range compression: quieter peaks, clearer balanceVolume jumps between channels: managing loudness without chasing the remoteAudio sample rate: what 44.1 kHz and 48 kHz meanVirtual surround versus a multichannel source: understanding the distinctionMono audio: keeping both stereo channels available in one listening pathMissing dialogue in surround sound: checking the centre channelCaptions versus subtitles: choosing the text a viewer needsOpen and closed captions: why some text cannot be switched offSDH subtitles: useful sound information alongside dialogueForced subtitles: translations that appear only when neededExternal SRT subtitles: matching the right version to the videoWebVTT subtitles: text cues with timing and placementGarbled subtitle characters: an encoding problem, not a language settingSubtitle delay: fixing a constant offset without changing the audioSubtitles that drift through a film: finding a mismatched versionMaking captions readable without covering the programmeLive captions versus prepared captions: useful tools with different limitsScreen readers and video players: controls need meaningful labelsKeyboard-only playback: checking the controls before settling inReduced motion: calmer menus without changing the programmeAutoplay previews: keeping browsing under the viewer’s controlFollowing a programme through audio: choosing the right supportTranscripts and captions: two ways to access spoken informationTranslated subtitles and original-language captions: choosing for comprehensionTwo sets of subtitles: removing duplication without losing accessCaption preferences on a shared device: making choices predictableTV sharpness: why a higher setting can make edges look worseNoise reduction and smeared faces: finding a sensible balanceMPEG noise reduction: what a television can and cannot clean upWhite outlines around objects: spotting edge-enhancement halosColour banding: why smooth skies become visible stripesBlack crush: recovering shadow detail without making everything greyClipped highlights: when bright detail disappearsWarm versus cool picture modes: making white look naturalColour saturation: avoiding bright logos and unnatural facesDynamic contrast: why brightness can change within a sceneLocal dimming and bright subtitles: understanding bloomingFilm grain or a poor stream? Reading texture without erasing itMotion blur already in the camera image cannot be switched off locallyMacroblocking in sport: why crowds and grass break into squaresCrawling noise around text: recognising compression artefactsGradient smoothing: reducing bands without erasing textureWhy picture quality can change after a scene cutWhy a paused screenshot is not a complete picture-quality testWhy an HDR screenshot can look wrong on another screenUsing TV test patterns without turning viewing into guessworkA fixed bright dot or a moving video artefact?Browser zoom and video size: keeping controls usableCasting versus screen mirroring: two different playback routesSharing playback information without exposing account detailsWhy filming a television creates bands or flickerGamma and midtones: why a picture can look flat or heavyComb-like edges in moving video: checking deinterlacingA split moving picture: screen tearing versus ordinary stutter
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