Some vhs tapes have time sync problems, and the rows exhibit severe jitter. This plugin examines the specified window of each of the rows and tries to find the amount by which the pixels are out of alignment, adds the sync signal width and shifts, to put them in correct alignment. Dark scenes with luma less than 50 or so may give erroneous results. The resulting voids at the right ends of the rows are greyed out or end color is extended. In avisynth+ version the end is blackend, and using last determined value is not available.
RGB32, RGB24, YUY2 and YV12 (other Planar formats with 2.6 version and avisynth+ version) formats are supported. In case of RGB the minimum shift value determined for red green and blue colors is used and for YUY2 and Planar formats the Y value is used to determine shift required. The resulting blank ends are filled with either last pixel color or greyed out. In avisynth+ version the end is blackened only. The last determined shift value can be used in case determination fails(not in avisynth+ version)
|maximum jitter in pixels||jmax||integer||within clip, >3||32|
|threshold value for detection||th||integer.( float for avisynth+)||1 to 255, (0.005 to 0.5 in avisynth+)||80 (0.25 in avisynth+)|
|sync signal width||wsyn||integer||0 to frame width-jmax||10|
|color to be extended or greyed out into blank area. Ignored in avisynth+ version||extend||boolean||true for extend last pixel value||false|
|use last determined value if failed on this scan line. Ignored by avisynth+ version||uselast||boolean||true for use last value||false|
|To my index page||down load plugin||To Avisynth|