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Container Format: Simple Definition

A container format (also called a wrapper or mux) is a file format that packages together different types of data - typically video, audio, and subtitles - into a single file.

The container is like a box that holds separate items. An MP4 file (container) holds H.264 video (codec), AAC audio (codec), and maybe subtitle text - all bundled together so your media player can synchronize and play them correctly.

Containers vs Codecs

People often confuse containers and codecs. The container (MP4, MKV, MOV) determines how data is organized in the file. The codec (H.264, H.265, AAC) determines how each data stream is compressed.

The same video stream can be put in different containers. H.264 video can be in an MP4, MKV, or MOV file. The video quality is identical - only the container is different. This is why “remuxing” (changing container) does not require re-encoding and has no quality loss.

Examples of Container Format