Originally committed as revision 17102 to svn://svn.ffmpeg.org/ffmpeg/trunk
* 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).
* else all timestamps are in units of the stream selected by stream_index or
- * if its -1 AV_TIME_BASE units.
+ * if stream_index is -1, 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).
*