Seek to the keyframe at timestamp.
'timestamp' in 'stream_index'.
@param s media file handle
@param stream_index If stream_index is (-1), a default
stream is selected, and timestamp is automatically converted
from AV_TIME_BASE units to the stream specific time_base.
@param timestamp Timestamp in AVStream.time_base units
or, if no stream is specified, in AV_TIME_BASE units.
@param flags flags which select direction and seeking mode
@return >= 0 on success
Seek to the keyframe at timestamp. 'timestamp' in 'stream_index'.
@param s media file handle @param stream_index If stream_index is (-1), a default stream is selected, and timestamp is automatically converted from AV_TIME_BASE units to the stream specific time_base. @param timestamp Timestamp in AVStream.time_base units or, if no stream is specified, in AV_TIME_BASE units. @param flags flags which select direction and seeking mode @return >= 0 on success