Many platforms offer access to dedicated hardware to perform a range of video-related tasks. Using such hardware allows some operations like decoding, encoding or filtering to be completed faster or using less of other resources particularly CPUbut may give different or inferior results, or impose additional restrictions which are not present when using software only.
Hardware decoders will generate equivalent output to software decoders, but may use less power and CPU to do so. Feature support varies — for more complex codecs with many different profiles, hardware decoders rarely implement all of them for example, hardware decoders tend not to implement anything beyond YUV at 8-bit depth for H. A common feature of many hardware decoders to be able to generate output in hardware surfaces suitable for use by other components with discrete graphics cards, this means surfaces in the memory on the card rather than in system memory — this is often useful for playback, as no further copying is required before rendering the output, and in some cases it can also be used with encoders supporting hardware surface input to avoid any copying at all in transcode cases.
Hardware encoders typically generate output of significantly lower quality than good software encoders like x, but are generally faster and do not use much CPU resource. That is, they require a higher bitrate to make output with the same perceptual quality, or they make output with a lower perceptual quality at the same bitrate. Things like scaling and deinterlacing are common, other postprocessing may be available depending on the system. Where hardware surfaces are usable, these filters will generally act on them rather than on normal frames in system memory.
There are a lot of different APIs of varying standardisation status available. FFmpeg offers access to many of these, with varying support. Internal hwaccel decoders are enabled via the -hwaccel option.
The software decoder starts normally, but if it detects a stream which is decodable in hardware then it will attempt to delegate all significant processing to that hardware. If the stream is not decodable in hardware for example, it is an unsupported codec or profile then it will still be decoded in software automatically. External wrapper decoders are used by setting a specific decoder with the -codec:v option.Icdar papers
These decoders require the codec to be known in advance, and do not support any fallback to software if the stream is not supported. Encoder wrappers are selected by -codec:v. Encoders generally have lots of options — look at the documentation for the particular encoder for details. Hardware filters can be used in a filter graph like any other filter. Note, however, that they may not support any formats in common with software filters — in such cases it may be necessary to make use of hwupload and hwdownload filter instances to move frame data between hardware surfaces and normal memory.
To enable this you typically need the libvdpau development package in your distribution, and a compatible graphics card. Also, note that with this API it is not possible to move the decoded frame back to RAM, for example in case you need to encode again the decoded frame e. DXVA2 hardware acceleration only works on Windows. For MinGW64, dxva2api. One way to install mingw-w64 is through a pacman repository, and can be installed using one of the two following commands, depending on the architecture:.
They can be used for encoding and decoding on Windows and Linux. In order to enable it in FFmpeg you need:. FFmpeg will look for its pkg-config file, called ffnvcodec. See encoder info as shown above. They differ in how frames are decoded and forwarded in memory. The full set of codecs being available only on Pascal hardware, which adds VP9 and 10 bit support.
If ffmpeg was compiled with support for libnpp, it can be used to insert a GPU based scaler into the chain:. On Linux it has some different feature set and helpful for some use-cases desiring maximum throughput. To build, OpenCL 1. At run-time, an OpenCL 1.
CPU implementations are also usable, but may be slower than using native filters in ffmpeg directly. The supported methods are:. Powered by Trac 1.FFmpeg can be hooked up with a number of external libraries to add support for more formats.
None of them are used by default, their use has to be explicitly requested by passing the appropriate flags to. Then pass --enable-libaom to configure to enable it. To enable support you must obtain the AMF framework header files version 1.
Then configure FFmpeg with --enable-amf. Initialization of amf encoder occurs in this order: 1 trying to initialize through dx11 only windows 2 trying to initialize through dx9 only windows 3 trying to initialize through vulkan.
To use h. FFmpeg can read AviSynth scripts as input. Distributors can build FFmpeg with --enable-avisynthand the binaries will work regardless of the end user having AviSynth installed. FFmpeg can make use of the Chromaprint library for generating audio fingerprints. Pass --enable-chromaprint to configure to enable it.
FFmpeg can make use of the codec2 library for codec2 decoding and encoding. There is currently no native decoder, so libcodec2 must be used for decoding. Build and install using CMake. Debian users can install the libcodec2-dev package instead. Once libcodec2 is installed you can pass --enable-libcodec2 to configure to enable it. The easiest way to use codec2 is with. To encode such a file, use a. Playback is as simple as ffplay output. Raw codec2 files are also supported.
To make sense of them the mode in use needs to be specified as a format option: ffmpeg -f codec2raw -mode -i input. Then pass --enable-libdav1d to configure to enable it.
Then pass --enable-libdavs2 to configure to enable it.VideoHelp Forum. Remember Me? Download free trial! Results 1 to 17 of So here's my story, its sort of a two-part question: for quicksync support in ffmpeg and how to increase the encoding speed through ffmpeg.
I don't use ffmpeg for quicksync. But after searching for how to encode videos with audio in one sweep through QSEnvc through what I thought was with --avqsv and failed, I started searching around for other alternatives.
However, I can't seem to find an ffmpeg build that includes quicksync support. I don't get it. I mean, whats the point of compiling it into ffmpeg if its not gonna work?
Are anyone using quicksync via ffmpeg?1985 glastron boat
And no one is reporting its failure? I don't know. The last build I could find, after searching around again, was ffmpeg 4. Does anyone have any ideas? Last edited by vhelp; 12th Feb at Works ok in ffmpeg with zeranoe's windows ffmpeg builds here with proper speeds. I tested avs input directly wiht a 32bit build Any slow filters other bottlenecks?
Intel® Quick Sync Video
According to your log it's YUY2 inputand you're encoding YV12 so maybe some additional unoptimized conversion routines going on in the ffmpeg version? Maybe try converting in the script. Last edited by pandy; 12th Feb at Is QuickSync working at all for you? I keep mine disabled, so can't test. Definitely ffmpeg is active project in a good and bad way - saw many times regressions in new builds - accordingly to Intel ffmpeg pdf's command line is simple and straightforward so i would expect or problem with QSV libs itself in your OS or with ffmpeg - definitely i would not give up with QSV but just try or private ffmpeg build or different builds from zeranoe for example.
Attached Thumbnails. Originally Posted by vhelp. Similar Threads Willing to pay ffmpeg Need help downloading live stream ffmpeg and rtmp By grabyea in forum Video Streaming Downloading. Replies: 0 Last Post: 10th Apr How to enable Intel Quicksync encoding? By videobruger in forum Video Conversion.
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Ultra HD video is everywhere, creating and viewing is more important and fun than ever. Video content is typically compressed and encoded into a specific format when it is stored on hard drives, DVDs, camcorders, cell phones, or broadcast media.
When you want to play that content, upload it online, or copy it to your phone, it must first be decoded and then re-encoded in a new format, a resource- and time-intensive process.
Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up. I was expecting ffmpeg to encode my video using a hw accelerated h encoder via Intel QuickSync. I'll document the steps needed to derive an FFmpeg build with the features you require QuickSync with support for extra codecs as may be needed, with extra notes on using the correct driver below:.
Libva :. VA-API is an open-source library and API specification, which provides access to graphics hardware acceleration capabilities for video processing.
It consists of a main library and driver-specific acceleration backends for each supported hardware vendor. Intel Media driver:. It is supported on platforms that the intel-media-driver is targeted for. For supported features per generation, see this. CMake will automatically detect the platform you're on and enable the platform-specific hooks needed for a working build. Build and deploy nasm: Nasm is an assembler for x86 optimizations used by x and FFmpeg.
Highly recommended or your resulting build may be very slow. Note that we've now switched away from Yasm to nasm, as this is the current assembler that x,x, among others, are adopting.
Build and deploy libx statically: This library provides a H. See the H. This requires ffmpeg to be configured with --enable-gpl --enable-libx Build and configure libx This library provides a H. Build and deploy the libfdk-aac library: This provides an AAC audio encoder. This requires ffmpeg to be configured with --enable-libfdk-aac and --enable-nonfree if you also included --enable-gpl. Typically, you will need to initialize a hardware device that will be used by both the encoder s in use and filtering, as shown in the example below:.Fanuc oi mate tc maintenance manual
Take note that both examples above will use the constant bitrate control CBR method in MFX, as shown in the console log:.
Rate control, similar to how the VAAPI implementation governs it, is driven by the parameters -b:v target video bitrate and the -maxrate:v maximum video bitrate passed to the encoder.
If they are equal, CBR constant bitrate control is used. If maxrate is greater than target bitrate, then VBR, and in effect, look-ahead based control if so desired are enabled.These are standard Windows APIs, which are implemented by the Intel graphics driver to support video decode. This is a library from Intel which can be installed as part of the Intel Media SDK, and supports a subset of encode and decode cases.
This is a library supplied with Intel's graphics drivers which supports all encode and decode cases. Not supported in ffmpeg. Most Linux distributions package it. A whole open source media stack is provided with much wider HW platforms and Linux distributions supported. But; HEVC encoding is for evaluation purposes only and will limit the encode to a mere frames. The library has a large number of options to set, the possible valid values of are dependent on the version and hardware.
Note that the kernel patches and modified system libraries are all required. All of the user source code is available, but it includes proprietary blobs of compiled GPU code. Since the complete human-readable source is not available, this certainly renders it GPL-incompatible and is likely to cause issues with other copyleft licences. Using the libva dynamic-loading shim mostly sidesteps this, and therefore is encouraged.
Powered by Trac 1. Sandy Bridge gen6 VC-1 decode; H. Bay Trail gen7 - Haswell gen7. Braswell gen8 H. Skylake gen9 H. Apollo Lake gen9 VP9, H. Kaby Lake gen9. Coffee Lake gen9. Linux A whole open source media stack is provided with much wider HW platforms and Linux distributions supported.
Runs on all usable hardware, including older and cheaper devices.
Intel® Quick Sync Video and FFmpeg Performance
Wider codec support. May give higher encode throughput in some cases such as MFE, particularly on Iris graphics. Common API for applications which may also run on Windows. Interoperable with Intel OpenCL implementation. Starting from Ubuntu It is also possible to extract the necessary files from the Media SDK installation as described in the install manual - this is not recommended, just use the package instead.
Target machine: Ensure the target machine has a supported CPU. Get a clean version of the supported kernel version currently 4. Build and install. Build and install the supplied libva and libdrm trees. Run the Media SDK install script to install the proprietary components.Fiorano modenese
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