Lav video dxva2 native vs copy back

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Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. User Name Remember Me? What's the difference between Copyback and Native? I would assume that "copy back" means that the decompressed frames are copied back to main memory after they have been decompressed by the graphic card's hardware decoder.

Lav video dxva2 native vs copy back

MediaPortal 1. After clicking on the screwdriver icon next to the LAV Video Decoder, you'll be presented with the following settings screen:. DXVA implementations come in two variants: native and copy-back. Almost all implementations are of the native type. The LAV video decoder that is included in the pack offers both variants. With the native type, the decoded video stays in GPU memory until it has been displayed. This brings some limitations with regard to playback. The DXVA decoder must be connected directly to the video renderer. There can be no processing filter in between. The video renderer must also support DXVA, which give you a bit less freedom of choice in renderers. The reason for keeping the decoded video inside GPU memory is efficiency. They are too slow for smooth playback. They can only copy data fast in the other direction. Such implementations don't have the limitations mentioned above and act similar to a normal software decoder. Otherwise it will give stuttering video playback.

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Active topics Unanswered topics. You must login or register to post a reply. RSS topic feed. I used D3D11 Native to test and I think it is working ok. D3D11 decodes frames from video stream and leaves them in video memory.

Corporate Solutions: Overview Customers Company. Home Download Purchase Support Company. Please login or register. Pages: [ 1 ] Go Down. CUVID forces the graphics card into its highest performance state. One of the reasons to use hardware accelerated decoding is to reduce power consumption.

Lav video dxva2 native vs copy back

Our decoding and rendering benchmarks consists of standardized test clips varying codecs, resolutions and frame rates being played back through MPC-HC. The former provides hints on whether frame drops could occur, while the latter is an indicator of the efficiency of the platform for the most common HTPC task - video playback. The Enhanced Video Renderer is the default renderer made available by Windows 8. It is a lean renderer in terms of usage of system resources since most of the aspects are offloaded to the GPU drivers directly. Deinterlacing and other post processing aspects were left at the default settings in the Intel HD Graphics Control Panel and these are applicable when EVR is chosen as the renderer. Power consumption shows a tremendous decrease across all streams. In general, using the QuickSync decoder results in a higher power consumption because the decoded frames are copied back to the DRAM before being sent to the renderer.

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The graph building has never used GPU information before, so this change does require creating a Direct3d device, asking it a few questions, and releasing it. Recently Updated. Jump to Latest Follow. MediaPortal 1. I have a video sample that is top end and absolutely kills my 8 logical core i7 CPU. Mark Forums Read. If you are seeing dropped and repeated frames, it sounds like your madVR settings are too demanding for the card. This comes at a small cost of quality chroma is slightly blurred, iirc , but should improve performance. I don't want upscale or other tweaks for a 4k movie. There can be no processing filter in between. No it won't be able to get the most out of madVR. I dont want that. The critical viewing one is with gamma 2. Decoding it to RGB then should look like this:. JeffR1 said:.

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Please login or register. There is also vsynctester. It feels like I'm seeing too much. On the other hand, the setting does have an option to enable it "if the display refresh rate is an exact multiple of the movie frame rate" which would seem to indicate that Madshi is still trying to do some kind of intentional smoothing not targeted at reducing judder. At what point does investing in the cpu have diminishing returns? Haven't a clue? I am using W Then everyone will be using 10 bit video in the consumer space. In reaching this goal we are working every day to make sure our software is one of the best. Joined Nov 3, I'm glad to hear that this wasn't the cause of your problems, and that things are working smoothly now. Thread Tools.