[ CCode ( cname = "GST_VIDEO_RESAMPLER_OPT_ENVELOPE" ) ]
public const string RESAMPLER_OPT_ENVELOPE
G_TYPE_DOUBLE, specifies the size of filter envelope for GST_VIDEO_RESAMPLER_METHOD_LANCZOS.
values are clamped between 1.0 and 5.0. 2.0 is the default.