<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hi everybody, as a good practice I prefer to share as much information as possible, that's why I'm writing here for a question mainly directed to Tim-Phillip, at least I guess... We are developing a video-surveillance Windows application based on GStreamer where we can have multiple windows each with many videos inside it, for a total of tenth of simultaneously running videos. After many performance tests we came to Direct3D  video sink before it was officially released (we started from Git development version) and we are very satisfied with it, though we noticed a very poor behavior when as an example we rescale the multiple videos window, graphics are so slow that they are quite unusable for a long time. After many tests we found out that simply avoiding the registration of WndProcHook function fixes most of our issues, graphics is very responsive and everything is fine, no particular feature (at least for what we need) is missing. Moreover Direct3D swap chain is correctly managed even if gst_d3dvideosink_refresh is not directly called. May you please explain us the reason for this implementation? We did not find anything similar for example in VLC Direct3D video output module. Many thanks in advance for your kind support, Matteo </body> </html>