VapourSynth 1.0 documentation
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# PEMVerifier

`std.``PEMVerifier`(clip clip[, int[] upper, int[] lower])

  The PEMVerifier is used to check for out of bounds values during filter development. It is a public function so badly coded filters won’t go unnoticed. If no values are set then upper defaults to the max value allowed in the format and lower defaults to 0 for all planes. If an out of bounds value is encountered a frame error is set and the coordinates of the first bad pixel are included in the error message.