Originally committed as revision 25590 to svn://svn.ffmpeg.org/ffmpeg/trunk
@var{sync_stream_id} if specified sets the input stream to sync
against.
@item -map_meta_data @var{outfile}:@var{infile}
-Set meta data information of @var{outfile} from @var{infile}.
+Set meta data information of @var{outfile} from @var{infile}. Note that those
+are file indices (zero-based), not filenames.
@item -debug
Print specific debug info.
@item -benchmark