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docs: Revise Intel QSV article.
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Bradley Sepos
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---
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Type: article
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State: [ draft ]
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Title: Intel QuickSync
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Title: Intel QuickSync Video (QSV)
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Project: HandBrake
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Project_URL: https://handbrake.fr/
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Project_Version: Latest
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Language: English
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Language_Code: en
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Authors: [ Scott (s55) ]
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Authors: [ Bradley Sepos <bradley@bradleysepos.com> (BradleyS), Scott (s55) ]
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Copyright: 2019 HandBrake Team
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License: Creative Commons Attribution-ShareAlike 4.0 International
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License_Abbr: CC BY-SA 4.0
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License_URL: https://handbrake.fr/docs/license.html
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---
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Intel Quick Sync Video
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==========================
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Intel QuickSync Video (QSV)
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===========================
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Supported Hardware and Configurations
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--------------
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- Intel Skylake Processors (6th Generation Core) CPU's with Intel HD Graphics better
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- Windows 10 (GUI and CLI)
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## Supported hardware
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- Intel Skylake (6th Generation Core) CPU or later with Intel HD Graphics or better
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- Windows 10
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- Linux (Available in our flatpak build via a plugin)
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Please note, these are not hard limits and the feature *may* work on older cards and operating systems, but this is not officially supported.
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Please note, these are not hard limits. Hardware encoding via Intel QSV *might* work on older series GPUs and older operating systems, but this is not officially supported.
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Enabling support
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--------------
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Support for the QuickSync encoder can be enabled in preferences under the video tab. If your system is not supported, the option will be greyed out.
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## Enabling support
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Support for the Intel QSV encoder is enabled in preferences on the video tab. If your system is not supported, the option will be disabled.
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Performance
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--------------
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Take note that only the decode (when enabled) and encode portions of the pipeline is done on the Intel hardware.
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Every stage in the pipeline in-between including (decoding, filters, a/v sync, muxing etc.) all happen on the CPU. As a result, it is normal to have high, or 100% CPU utilisation during encodes.
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## Performance
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It is common, particularly on lower end hardware that the CPU may be a bottleneck for the encoder. To minimise this effect, turn off any filters that you do not require.
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Only video encoding is performed by the hardware encoder. Every stage prior to and after video encoding including decoding, filters, audio/video sync, audio encoding, muxing, etc., is performed by the CPU. As a result, it is normal to have high (even 100%) CPU utilisation during encodes.
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It is common, particularly on lower-end hardware, for the CPU to be a bottleneck for the hardware video encoder. To minimise this effect, disable any filters that you do not require.
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Using the Advanced Options
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--------------
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QuickSync does have a limited set of advanced encoder options that can be used. Generally speaking is is not recommended to change these parameters.
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The built-in presets offer a good range of options.
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## Advanced options
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From the command line, you can use the --encopts parameter as follows:
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The Intel QuickSync hardware encoder has a limited set of advanced encoder options. Generally speaking, it is not recommended to change these parameters, as the built-in presets offer a good range of options for common uses.
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From HandBrake’s command line interface, use the `--encopts` parameter as follows:
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--encopts="option1=value1:option2=value2"
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From the graphical user interface, just set the options in the dedicated text box:
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From HandBrake’s graphical interface, set the options in the `Advanced Options` field on the `Video` tab:
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option1=value1:option2=value2
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Option Types
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--------------
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### Option value types
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The following value types are supported (each option only accepts one value type):
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- integer
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@ -64,17 +59,12 @@ The following value types are supported (each option only accepts one value type
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1 means on (or enabled).
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- string
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Takes a setting defined as s string. See comment for details.
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Available Options
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--------------
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Available Options
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--------------
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An alphanumeric string of characters. See the option’s comments for acceptable values.
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### Options list
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- target-usage (or tu) <integer>
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- Sets the trade-off between quality and speed, from 1 (best quality) to 7 (best speed).
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- Sets the trade-off between quality and speed, from 1 (best quality) to 7 (fastest speed).
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- Default: 2
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- num-ref-frame (or ref) <integer>
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@ -101,7 +91,7 @@ Available Options
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- cavlc <boolean>
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- Use CAVLC instead of CABAC entropy coding. Reduces compression efficiency.
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- It may improve encoding performance slightly, especially on older hardware.
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- Note: you can also use ''cabac'' (same as ''cavlc'' with reversed meaning).
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- Note: you can also use `cabac` (same as `cavlc` with reversed meaning).
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- Default: 0 (CAVLC off, CABAC on)
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- b-pyramid <integer>
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@ -118,7 +108,7 @@ Available Options
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- Enables macroblock-level bitrate control that generally improves subjective visual quality.
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- It may have a negative impact on performance and objective visual quality metrics.
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- Default: 1 (on)
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- Note: not compatible with Constant QP or !LookAhead rate control methods (ignored).
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- Note: not compatible with Constant QP or LookAhead rate control methods (ignored).
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- Caveats: requires hardware support (4th gen. Intel Core processor or equivalent), and driver support for version 1.6 of the Media SDK API.
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- extbrc <boolean>
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@ -126,7 +116,7 @@ Available Options
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- It generally improves objective visual quality metrics and subjective visual quality,
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- but can also lead to violation of HRD conformance and may significantly reduce performance.
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- Default: 0 (off)
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- Note: not compatible with Constant QP or !LookAhead rate control methods (ignored).
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- Note: not compatible with Constant QP or LookAhead rate control methods (ignored).
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- Caveats: requires driver support for version 1.6 of the Media SDK API.
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- trellis <integer>
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@ -140,12 +130,12 @@ Available Options
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- Caveats: requires hardware support (4th gen. Intel Core processor or equivalent), and driver support for version 1.7 of the Media SDK API.
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- lookahead (or la) <boolean>
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- Use the !LookAhead (LA or LA_ICQ) bitrate control algorithm.
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- Use the LookAhead (LA or LA_ICQ) bitrate control algorithm.
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- Default: 1 (on)
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- Caveats: requires hardware support (4th gen. Intel Core processor or equivalent), and driver support for version 1.7 (1.8 for LA_ICQ) of the Media SDK API.
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- lookahead-depth (or la-depth) <integer>
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- If !LookAhead bitrate control is enabled, number of frames that are analyzed before encoding, from 11 to 60.
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- If LookAhead bitrate control is enabled, number of frames that are analyzed before encoding, from 11 to 60.
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- Default: 40
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- Note: may be sanitized to a lower value in some cases to avoid hangs.
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- Caveats: requires hardware support (4th gen. Intel Core processor or equivalent), and driver support for version 1.7 of the Media SDK API.
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@ -161,16 +151,16 @@ Available Options
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- vbv-maxrate <integer>
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- Sets the maximum rate the VBV buffer should be assumed to refill at, in kilobits per second (Kbps).
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- Default: 0 (set at runtime by the implementation)
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- Note: not compatible with Constant QP, Intelligent Constant Quality or !LookAhead rate control methods (ignored).
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- Note: not compatible with Constant QP, Intelligent Constant Quality or LookAhead rate control methods (ignored).
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- vbv-bufsize <integer>
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- Sets the size of the VBV buffer in kilobits (Kb).
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- Default: 0 (set at runtime by the implementation)
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- Note: not compatible with Constant QP, Intelligent Constant Quality or !LookAhead rate control methods (ignored).
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- Note: not compatible with Constant QP, Intelligent Constant Quality or LookAhead rate control methods (ignored).
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- vbv-init <float>
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- Sets how full the VBV Buffer must be before playback starts.
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- If it is less than 1, then the initial fill is: vbv-init * vbv-bufsize.
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- Otherwise it is interpreted as the initial fill in kilobits (Kb).
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- Default: 0 (set at runtime by the implementation)
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- Note: not compatible with Constant QP, Intelligent Constant Quality or !LookAhead rate control methods (ignored).
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- Note: not compatible with Constant QP, Intelligent Constant Quality or LookAhead rate control methods (ignored).
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