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A container is the file structure that holds video, audio, subtitles, and metadata; a codec is the method used to compress and decode an individual media stream. MP4 and WebM are containers, while H.264, VP9, and AV1 are codecs.
Read the evidence →Multiply the combined video and audio bitrate by the duration in seconds, then divide by eight to convert bits to bytes. Divide again by 1,000,000 for an approximate decimal megabyte value.
Read the evidence →Keep the original width-to-height ratio. When you choose a new width, calculate the height as new width × original height ÷ original width; crop or pad if the destination requires a different ratio.
Read the evidence →Choose H.264 when broad playback compatibility is the priority. VP9 and AV1 can provide better compression, but encoding support, playback hardware, editing software, and the destination platform must all be checked first.
Read the evidence →Many video pipelines use chroma-subsampled pixel formats that group colour information across more than one pixel. Even width and height values avoid partial chroma blocks and compatibility errors in common encoding workflows.
Read the evidence →No. Public accessibility and reuse permission are different. Reuse requires a licence, permission from the rights holder, public-domain status, or another applicable legal basis.
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