AVStream是存儲每一個視頻/音頻流信息的結構體。該結構體定義位于libavformat/avformat.h中，如下：

/*** Stream structure.* New fields can be added to the end with minor version bumps.* Removal, reordering and changes to existing fields require a major* version bump.* sizeof(AVStream) must not be used outside libav*.*/ typedef struct AVStream {//AVFormatContext中的流索引，標識視頻流或者音頻流int index; /**< stream index in AVFormatContext *//*** Format-specific stream ID.* decoding: set by libavformat* encoding: set by the user, replaced by libavformat if left unset*/int id;void *priv_data;/*** This is the fundamental unit of time (in seconds) in terms* of which frame timestamps are represented.** decoding: set by libavformat* encoding: May be set by the caller before avformat_write_header() to* provide a hint to the muxer abo

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