Hi all, I am trying to perform hardware accelerated decode of 720P h264 encoded stream using Gstreamer Vaapi decode and Vaapisink plugins .I am using ATI Radeon 5600 GPU . My requirement is to get the image data from the Vaapi Surface after decoding .I want to perform some operations on this image like scaling ,composing the two images . As of now i tried to extract the image from the Vaapisurface by using the functions in Gstreamer Vaapi library , image = gst_vaapi_surface_derive_image(surf); value = gst_vaapi_surface_get_image(surf,image); the about functions were unsuccessful and i couldn't get the image data from the Vaapi surface . Is there any way i can perform scaling and composing directly on the Vaapi surfaces without extracting the image data ?what do you suggest ,should i use gstreamer vaapi plugins or libva API's directly to do the above mentioned tasks ?if i can work using libva API's ,can anyone explain me how to perform scaling and composing of two vaapi surfaces? Any help is highly appreciated . Thanks, N Sivaramkrishna.