Which makes me tend to think that these software pieces are able to handle these data and transmit it to the cpu. Hardware decoding vs software decoding in 4k h264h265 video. So long as the instructions sets are the same, we are dealing with identical images, regardless of who manufactures the hardware. May 24, 2017 this document is the specification for support of scalable video coding svc according to the h. This topic does not describe how to implement dxva decoding. After following the d3d decoding sample from the media sdk i was quickly able to integrate the hardware decoding capabilities of the media sdk using d3d surfaces with our existing software framework. Directx video acceleration dxva is a microsoft api specification for the microsoft windows and xbox 360 platforms that allows video decoding to be hardware accelerated. Reinstalled the software without results, checked cables, in fact checked everything. To enable the most efficient use of resources and avoid costly memory copies from the surface and back in directx i. Mpchc offers a few different options for video decoders. Once you have met the hardware and software requirements, you. In dxva, some decoding operations are implemented by the graphics hardware driver. Software and hardware decoding can produce the same results hardware is running software to do the decoding, but as its hard wired, it runs it quicker than software running on a general purpose processor.
Gf gtx 1060 cant efficiently accelerate hevc vp9 with software players like mpchc and potplayer. What is the relationship between hardware acceleration and. Configuring potplayer for gpuaccelerated video playback with. Dxva checker complete changelog release notes version. Dxva is simply a software interface that can enable applications to take advantage of cpu. Mar 23, 2016 dxva implementations of the copyback type will, as the name already suggests, copy the decoded video from gpu memory back to cpu memory. Dec 04, 2018 power consumption will get sharply increased in software decoding, almost 7688mw for 1080p and 14400mw for 4k 2160p video. To use dxva gpu hardware decoding tech in vlc, youre required to. The pipeline allows certain cpuintensive operations such as idct, motion compensation and deinterlacing to be offloaded to the gpu. Gpu to accelerate decoding of video streams depending on the video codec, graphic card model and operating system. Once you click on the download button, you will be prompted to select the files you need. Mftvideo decoder dxva fallback to software decode in a. Nov 08, 2015 a small demonstration clip comparing real time hevc decoding on fgpa vs lagged software decoding.
Best way to make media player classic use hardware acceleration. Potplayer potplayer installation, configuration and. This specification defines extensions to directx video acceleration dxva to support decoding of h. The software decoder also makes the computer you are using liquidsky on more slower if liquidsky is. Enabling highperformance video encoding, decoding, and.
Hardware decoding vs software decoding would be mentioned most in the field of hd 4k h264 hevc videos playback. I was told that ffdshow is a post processing filter for software decoding, and that. Hot network questions can you make a laser without cavity, if you have a pump strong enough. Dxva2 and cuvid are the two decoders i am going to test out on this page. How to use gpu decoding 264 stream, any open source code. The topology loader will then renegotiate the media type, and the mft can use software decoding. The cpu usage on my system is about 10 % lower in mpc hc than in mpc be 30 % vs 40 % in the same scene.
Hardware accelerated video decoding is the when a videoplayback software application offload portions of the video decoding process to the gpu graphic hardware, it does this by executing specific code algorithms on the gpu. There are multiple files available for this download. Question asked by buchanan on jul 18, 2016 latest reply on mar 9, 2017 by mclingo. How to tell if a dxva decoder has fallen back to software decoding. Software decoding is superior to hardware decoding in this aspect. What i noticed was that the software decoder starts up more faster and has no green screen on startup while dxva always has a green screen and also takes some time to load. Consequently, hardware decoding has an edge over software decoding in this round. However, not everyone knows how and when these technologies actually work and what real value they add. Processing performed by the accelerator is called offhost processing. Download this white paper in your choice of the following formats. The document describes highlevel design concepts and specific svc extensions to dxva interfaces and data structures of h.
I did try software decoder and hardware decoder on the client my i3 laptop and it flashes up with both, thats when i got wondering if the quicksync decoder should be working. The 4k videos droped frames and play the video on half fps and very high cpu usage in software players, despite the video processing engine of the gpu worked in both payers. Dxva checker is a small and very easytouse application that will provide you with various information about your decoder device and processor device. How to enable hardwareaccelerated decoding in libvlc. Do not select dxva copyback as it is the slowest video decoder. If hardware decoding is possible, use hardware decoding and leave software decoding for anything that the hardware decoder doesnt support. Jul 18, 2016 interlaced h264 dxva decoding on rx 480.
This set of functionality is termed the accelerator. One of these interfaces is then used by enduser software, for example vlc media player or gstreamer, to access the quick sync video hardware and make use of it. Enable hardware accelerated decoding via dxva2 in xbmc for windows. Software decoder vs dxva so i tried the software decoder today by disabling the dxva decoder. Dxva checker is an application that will provide you with various information about your decoder device and processor device that can be used with gpu. Dxva implementations of the copyback type will, as the name already suggests, copy the decoded video from gpu memory back to cpu memory. There are significant differences between using quicksync vs.
I would like to know how a codec written for dxva 2. By default mpchc uses the dxva native decoder if it detects hardware that supports it. This is the most efficient way to go in terms of processor resources and electrical consumption. Feb 08, 2015 how to test cpugpu for video decoding using dxva checker. Directx video acceleration, or dxva, is microsofts technology for the windows vista, 7, 8, and later oss, which allows video decoding to be gpu accelerated. Software based decoding is a different beast altogether. Such implementations dont have the limitations mentioned above and act similar to a normal software decoder. The goal is to figure out what video decoder offers the best video quality. The dxva is used by software video decoders to define a codecspecific pipeline for hardwareaccelerated decoding and rendering of the codec. Apr 09, 2016 hi, im facing a trouble with enabling dxva2 support in lav video decoder.
The amount of work that is done by the gpu depends on the graphics driver implementation. Of course those kind of video filters and many others can be executed by software like ffdshow in the cpu if you have a weak graphics card and a powerful processor. Feb 18, 2016 defines extensions to directx video acceleration dxva to support decoding of h. Dxva specification for svc offhost vld mode decoding. You can now make use of this small and simple software application to find out more about your decoder device in no time at all. Selecting a language below will dynamically change the complete page content to that language. Best way to make media player classic use hardware. Directx video acceleration dxva is a microsoft api specification for the microsoft windows and xbox 360 platforms that allows video decoding to be hardwareaccelerated. 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.
Mpchc video decoder comparison mpchc video decoders. Directx video acceleration dxva is an api and a corresponding ddi for using hardware acceleration to speed up video processing. Basically, dxva has software codecs that are capable to offload certain operations to be performed by a gpu. To enable hardware accelerated decoding, use the vlc preferences. The marjority of vso software video products supports hardware acceleration, but many users dont know what that means. Dxva2 native has its limitations, though i use it sometimes with interlaced video cause pci bus is too busy with traffic for copyback in this case. Defines extensions to directx video acceleration dxva to support decoding of h. As a last resort reinstalled windows 10, still the same hd issues. A guide on how to configure potplayer video player to use hardware acceleration using either directx video acceleration dxva, compute unified device architecture cuda or high performance software decoding with softsubtitles support, ffdshow raw video filter postprocessing and also madvr. I have updated amd crimson drivers to the latest version available but still the dxva2both native and copyback options of the lav video decoder doesnt show my amd radeon hd8750m card.
Video compression codecs are designed to all decode the same result. Hardware decoding vs software decoding of hevc youtube. I am trying to test decoding a h264h265 video with just a single iframe using dx11 and dxva2. Dxva2, also known as directx video acceleration allows your hardware to help handle parts of the video decoding process. Just to clear up hardware encoder is the nvifr h264 hardware decoder is dxva. Dxva native is usually the option to go with and its the default if you enable it in potplayer its just called dxva, for mpchc it. By the way, gpu decoding works fine for me with media player classic home cinema 1. Quicksync decode on sandybridge, for instance, cannot do 29. In theory this process should also reduce bus bandwidth. Intel quick sync video is a video encoding and decoding hardware within the. Directx video acceleration dxva specification for h. I also noticed that liquidsky with the software decoder seems somewhat blurrier than with the dxva decoder. The internal dxva decoders in mpchc are native implementations, and. I want to know the differences between the two guids.
Software codecs and software video processors can use dxva to offload certain cpuintensive operations to the gpu. This post is an attempt to explain nvidia cuda and dxva. What is the difference between a renderer and a decoder, when i asked on the shark007 forums about which is better lav or madvr, he told me madvr is a renderer and lav is a decoder and he refused to. Mpchc totally default settings dxva native this is what a 1280x534 mkv video looks like using mpchc media player classic home cinema with the default video renderer and video decoder. Dxva2 not supported in lav video decoder community. It also has software decoding to fall back to if the format is. Dxva uses a mixture of software and hardware for decoding. This specification assumes that you are familiar with the h. So it is not necessary to use the ffmpeg or ffdshowand the ffdshow is gpl, i cant use it. In potplayer i tried internal and external codecs like lav filters with all options. This is on windows 7 so i probably have to interop between 2 d3d11 devices, one with 11. Dxva copyback only works properly if the gpu can copy the data fast enough.
Not only can dxva2 be used for playback acceleration, it can be used to help with parts of the video recording process. To know if you should enable or not these options, follow this guide. This article will cover potential methods of and the development around hardware accelerated video decoding. Dxva2 is the second iteration of directx video acceleration dxva. Since i have a gtx 970, i selected cuda for most video types, and i selected dxva to be used.
It means there is a small chip on the motherboard specifically dedicated to decoding h264 video. Also, my input is yuy2 and output is nv12 12 bits, whereas with the built in decoder the input is avc1 and the output is yuy2 16 bits. Decoding and rendering benchmarks intels haswell an. Softwarebased decoding is a different beast altogether. By continuing to browse this site, you agree to this use. A small demonstration clip comparing real time hevc decoding on fgpa vs lagged software decoding. In simple words its a process whereby grain is filtered from a source before encoding and then added back in the player. If your computers cpu can handle it, and it doesnt make your cpu fans loud or anything like that, then you might as well just use software decoding.
This site uses cookies for analytics, personalized content and ads. Now, you know a thing or two about the differences between hardware decoding and software decoding and their respective advantages. If one decoder gave a different output than another, that would mean something was implemented incorrectly. According to lav filters author, cuvid and intel quicksync are outdated, dxva copyback direct mode beats them both in performance. So long as the instructions sets are the same, we are dealing with identical images, regardless.
The device driver provides one or more interfaces, for example vdpau, video acceleration api va api or dxva for video decoding, and openmax il or va api for video encoding. What is the relationship between hardware acceleration and dxva quicksynccuda. Download enabling highperformance video encoding, decoding, and preprocessing pdf 619kb the version 1. The limitation that the video decoder must be connected directly to the video renderer only applies the the native variant of dxva. Microsoft directx video acceleration dxva allows directshow based software decoders to accelerate video playback directly on the graphics processors gpu if your graphics processor supports dxva and has builtin technology to accelerate mpeg4. What is the difference between hardware decoding and. Many users of freemake movie converter heard of cuda and dxva technologies integrated into the software to speed up video conversion. This page or section may require cleanup, updating, spellchecking, reformatting andor updated images. Using native dxva decoding, the frames are directly passed to the renderer without the copyback step. The decoder should allocate 3 surfaces for the evr to use for deinterlacing.
I currently have no idea why this results in corruption, because disabling dxva, asking the mft to output memory buffers and doing the upload ourselves. The equivalents of software decoding are 9 hrs for 1080p video decoding and 5 hrs for 4k uhd decoding. May 24, 2012 dxva checker finds if your cpu or gpu supports directx video acceleration. It then turned out that i couldnt play recorded tsfiles. In some cases, it can let the graphic card perform postprocessing and rendering of the decoded video. Other decoding operations are implemented by usermode application software, called the host decoder or software decoder. Enable hardware accelerated decoding via dxva2 in xbmc. Decoding and rendering benchmarks intels haswell an htpc. The main a6 processor is not using or spending cycles decoding video, it has essentially outsourced that job to a highly specialized worker. Since software decoding can be updated via software, and can also be more tolerant of encoding errors and nonstandard settings, software cpu decoding can often give the best picture quality. This topic describes how to support directx video acceleration dxva 2. For example, a software decoder can offload the inverse discrete cosine transform idct to the gpu. Dxva2 dxva2 video rendering overview and explanation.
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