Hello , I am trying to use ON2's VP3 codec in a VC++ DirectX application. I get amazing clarity in the recorded video but simultaneous preview is very jerky. I am not sure how to change the codec properties in VC++ but theses are the changes i applied to the videoinfo header VIDEOINFOHEADER *pvi1 = (VIDEOINFOHEADER *)pmt1->pbFormat; pvi1->AvgTimePerFrame = (LONGLONG)(10000000 / 30); pmt1->majortype = MEDIATYPE_Video; pvi1->bmiHeader.biBitCount=24; pvi1->bmiHeader.biWidth=width; pvi1->bmiHeader.biHeight=height; pvi1->dwBitRate = 40; hr = pSC->SetFormat(pmt1); However i realised that changing the framerate from 30 to 15 didnt help any as the video still recorded @ 30fps. Any help regarding how to overcome the jerky preview will be greatly appreciated Regards, Rahul -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/theora/attachments/20060718/714608a7/attachment.html