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...not setted. in wine/dlls/quartz/videorenderer.c: VideoRenderer_Sample(LPVOID iface, IMediaSample * pSample) --> IMediaSample_GetTime(pSample, &tStart, &tStop) --> use tStart/tStop and current time to judge when to show the sample --> VideoRenderer_SendSampleData(This, pbSrcStream, cbSrcStream); why does OutputPin_GetDeliveryBuffer() set the MediaSample's start and stop reference time both to NULL? Consider this situation, we build a filter graph, use vfwcapture as capture filter, then connect it to any video renderer, of course video render will try to get MediaSample's start a...