ffmpeg seek--ts_ffmpeg seek ts

read_timestamp返回pos--pos_limit间的视频帧的dts信息；

/**
     * Get the next timestamp in stream[stream_index].time_base units.
     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
     */
    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
                              int64_t *pos, int64_t pos_limit);

基于二分查找实现seek，外部接口

/**
 * Perform a binary search using av_index_search_timestamp() and
 * AVInputFormat.read_timestamp().
 *
 * @param target_ts target timestamp in the time base of the given stream
 * @param stream_index stream number
 */
int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
                         int64_t target_ts, int flags);

二分查找实现seek，内部接口

/**
 * Perform a binary search using read_timestamp().
 *
 * @param targe