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From: Quartz <quartz@sneakertech.com>
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Subject: Re: Video DVD quality loss with mencoder/dvdauthor/growisofs
References: <20160815013606.896d920c.freebsd@edvax.de>
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Can you upload a picture somewhere with an example of the 'blockyness'? 
It's unclear from your description if you're seeing scaling artifacts or 
compression artifacts.