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okamibl / xy-vsfilter

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What is PAR Compensation? #54

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
What does Upscale, Downscale, Accurate Size do?

Original issue reported on code.google.com by ved_k...@ymail.com on 10 Nov 2011 at 9:46

GoogleCodeExporter commented 8 years ago 
They are for correcting the Pixel Aspect Ratio (PAR) of subtitles.

Basically it's a feature to compensate for VSFilter's default behavior of 
stretching subtitles in the case of anamorphic encodes or incorrect resolution 
specified in the script. If you are watching an anamorphic video with subtitles 
(.srt subtitles in particular), and they appear stretched horizontally, you 
could try enabling PAR compensation in VSFilter.

Just keep in mind that it was common for .ass/.ssa scripts to be created with 
PAR compensation contained within the script (using scale-x or scale-y) with 
the expectation that VSFilter PAR compensation is disabled, which is the 
default setting. Enabling VSFilter's PAR compensations with such scripts would 
give undesired results.

Original comment by cyber.sp...@gmail.com on 10 Nov 2011 at 11:19