AVCodecContext.time_base

This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. For fixed-fps content, timebase should be 1/framerate and timestamp increments should be identically 1. This often, but not always is the inverse of the frame rate or field rate for video. - encoding: MUST be set by user. - decoding: the use of this field for decoding is deprecated. Use framerate instead.

struct AVCodecContext
AVRational time_base;

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