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A codec describes how audio or video is compressed and decoded. A container packages tracks, timing and metadata together. MP4, Matroska and WebM are containers; H.264, HEVC and AV1 are video codecs. Playback requires a compatible combination rather than a familiar extension alone.
Explore guide ↗MP4 and MPEG transport stream organise compressed media differently. Transport streams have a history in broadcast delivery, while MP4 is common in files and modern segmented streaming. Neither container alone guarantees better picture quality, lower delay or compatibility with a particular player.
Explore guide ↗A codec family includes different profiles and levels that describe coding features and limits. A decoder may support only part of that family. Resolution, frame rate, bitrate and bit depth can therefore make one stream playable and another incompatible despite sharing a codec name.
Explore guide ↗Ten-bit video can represent more code values per colour component than 8-bit video. That can help preserve smooth gradients, but the source, encoding, display and processing chain still matter. Ten-bit also creates a compatibility requirement that some older decoding paths do not meet.
Explore guide ↗Chroma subsampling stores less colour detail than brightness detail. This is common in video because vision is more sensitive to fine brightness structure. Small coloured text and computer interfaces can expose the trade-off more clearly than natural scenes such as faces or landscapes.
Explore guide ↗Yes. Decoders often need a suitable independent picture and associated stream information before they can show video correctly. Keyframe spacing, buffering, access checks and network delivery can all influence startup, so a short delay is not automatically evidence of insufficient internet speed.
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