pads must be connected. A filtergraph is considered valid if all the
filter input and output pads of all the filterchains are connected.
-Libavfilter will automatically insert scale filters where format
+Libavfilter will automatically insert @ref{scale} filters where format
conversion is required. It is possible to specify swscale flags
for those automatically inserted scalers by prepending
@code{sws_flags=@var{flags};}
@end example
@end itemize
+@anchor{fps}
@section fps
Convert the video to specified constant frame rate by duplicating or dropping
Each chroma option value, if not explicitly specified, is set to the
corresponding luma option value.
+@anchor{scale}
@section scale
Scale (resize) the input video, using the libswscale library.