-@item skip_threshold @var{integer} (@emph{encoding,video})
-Set frame skip threshold.
-
-@item skip_factor @var{integer} (@emph{encoding,video})
-Set frame skip factor.
-
-@item skip_exp @var{integer} (@emph{encoding,video})
-Set frame skip exponent.
-Negative values behave identical to the corresponding positive ones, except
-that the score is normalized.
-Positive values exist primarily for compatibility reasons and are not so useful.
-
-@item skipcmp @var{integer} (@emph{encoding,video})
-Set frame skip compare function.
-
-Possible values:
-@table @samp
-@item sad
-sum of absolute differences, fast (default)
-@item sse
-sum of squared errors
-@item satd
-sum of absolute Hadamard transformed differences
-@item dct
-sum of absolute DCT transformed differences
-@item psnr
-sum of squared quantization errors (avoid, low quality)
-@item bit
-number of bits needed for the block
-@item rd
-rate distortion optimal, slow
-@item zero
-0
-@item vsad
-sum of absolute vertical differences
-@item vsse
-sum of squared vertical differences
-@item nsse
-noise preserving sum of squared differences
-@item w53
-5/3 wavelet, only used in snow
-@item w97
-9/7 wavelet, only used in snow
-@item dctmax
-
-@item chroma
-
-@end table
-
-@item border_mask @var{float} (@emph{encoding,video})
-Increase the quantizer for macroblocks close to borders.
-