函数 avformat_seek_file 

pub unsafe extern "C" fn avformat_seek_file(
    s: *mut AVFormatContext,
    stream_index: c_int,
    min_ts: i64,
    ts: i64,
    max_ts: i64,
    flags: c_int,
) -> c_int

Seek to timestamp ts. Seeking will be done so that the point from which all active streams can be presented successfully will be closest to ts and within min/max_ts. Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.

If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and are the file position (this may not be supported by all demuxers). If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames in the stream with stream_index (this may not be supported by all demuxers). Otherwise all timestamps are in units of the stream selected by stream_index or if stream_index is -1, in AV_TIME_BASE units. If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as keyframes (this may not be supported by all demuxers). If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.

@param s media file handle @param stream_index index of the stream which is used as time base reference @param min_ts smallest acceptable timestamp @param ts target timestamp @param max_ts largest acceptable timestamp @param flags flags @return >=0 on success, error code otherwise

@note This is part of the new seek API which is still under construction.