This can be improved in the decimate filter but for the moment
explicitely mentioning that mixed telecined and progressive
content is unsupported is an improvement.
Fixes ticket #3968.
which @code{fieldmatch} is based on. While the semantic and usage are very
close, some behaviour and options names can differ.
+The filter currently only works for constant frame rate input. Do not use it
+if your input has mixed telecined and progressive content with changing
+framerate.
+
The filter accepts the following options:
@table @option