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<blockquote data-quote="ziphnor" data-source="post: 70349" data-attributes="member: 14215">Thats interesting, where did you find it?From my quick google it seems that frame grabbing in C# is not that simple after all. Anyway if the most likely implementation is as an in-place transform filter(its probably not actually going to transform anything, but just scan a frame and then call somewhere else in MP for the cropping), i might as well start there. It seems that there is an interface called ISampleGrabber in C++, which basicly gives you a call back with the frame data. Its covered here:<a href="http://www.codeproject.com/audio/VideoAnaFramework.asp" target="_blank">http://www.codeproject.com/audio/VideoAnaFramework.asp</a>It might be sensible enough to do it in C++ in this manner(i dont mind,especially if a wrapper takes care of all the WinAPI/COM crap).Alternative i can just extend this filter base class:<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directshow/htm/ctransinplacefilterclass.asp" target="_blank">http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directshow/htm/ctransinplacefilterclass.asp</a>In that way i can test the filter using GraphEdit on video files, and it can then plug straight into MP afterwards.Im open to suggestions, but i think im going to try one of the above if nothing better shows up(they also have the extra benefit that they might help me implement the DS graph thread priority i was looking to implement a while ago).</blockquote>

[QUOTE="ziphnor, post: 70349, member: 14215"] Thats interesting, where did you find it? From my quick google it seems that frame grabbing in C# is not that simple after all. Anyway if the most likely implementation is as an in-place transform filter(its probably not actually going to transform anything, but just scan a frame and then call somewhere else in MP for the cropping), i might as well start there. It seems that there is an interface called ISampleGrabber in C++, which basicly gives you a call back with the frame data. Its covered here: [url]http://www.codeproject.com/audio/VideoAnaFramework.asp[/url] It might be sensible enough to do it in C++ in this manner(i dont mind,especially if a wrapper takes care of all the WinAPI/COM crap). Alternative i can just extend this filter base class: [url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directshow/htm/ctransinplacefilterclass.asp[/url] In that way i can test the filter using GraphEdit on video files, and it can then plug straight into MP afterwards. Im open to suggestions, but i think im going to try one of the above if nothing better shows up(they also have the extra benefit that they might help me implement the DS graph thread priority i was looking to implement a while ago). [/QUOTE]

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