Here is a Dark Souls Expert's Guide to Parrying by vageta311.
The video covers parrying and riposting from the most basic level to the frame counts of both parry window and recovery times. New players will likely learn a lot, while veteran players probably won't learn anything new until the final section. To my knowledge the actual frame counts have not been done before.
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If you have any of your own tips or tricks for parrying in Dark Souls, please post them in the comments below. Thanks for your contributions and for visiting the site. Hope this guide has helped you improve!