@@ -514,7 +514,7 @@ The segment muxer supports the following options:

 @item reference_stream @var{specifier}

 Set the reference stream, as specified by the string @var{specifier}.

 If @var{specifier} is set to @code{auto}, the reference is choosen

-automatically. Otherwise it must a stream specifier (see the ``Stream

+automatically. Otherwise it must be a stream specifier (see the ``Stream

 specifiers'' chapter in the ffmpeg manual) which specifies the

 reference stream. The default value is ``auto''.

@@ -661,7 +661,7 @@ required.

 @item

 Segment the input file by splitting the input file according to the

-frame numbers sequence specified with the @var{segment_frame} option:

+frame numbers sequence specified with the @var{segment_frames} option:

 @example

 ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut

 @end example