Configuration Parameter Constraints#

The mfxFrameInfo structure is used by both the mfxVideoParam structure during Intel^® VPL class initialization and the mfxFrameSurface1 structure during the actual Intel^® VPL class operation. The parameter constraints described in the following tables apply.

DECODE, ENCODE, and VPP Constraints#

The DECODE, ENCODE, and VPP Constraints table lists parameter constraints common to DECODE, ENCODE, and VPP.

DECODE, ENCODE, and VPP Constraints#
Parameters	Use During Initialization	Use During Operation
FourCC	Any valid value.	The value must be the same as the initialization value. The only exception is VPP in composition mode, where in some cases it is allowed to mix RGB and NV12 surfaces. See `mfxExtVPPComposite` for more details.
ChromaFormat	Any valid value.	The value must be the same as the initialization value.

DECODE Constraints#

The DECODE Constraints table lists DECODE parameter constraints.

DECODE Constraints#
Parameters	Use During Initialization	Use During Operation
Width, Height	Aligned frame size.	The values must be the equal to or larger than the initialization values.
CropX, CropY CropW, CropH	Ignored.	DECODE output. The cropping values are per-frame based.
AspectRatioW, AspectRatioH	Any valid values or unspecified (zero); if unspecified, values from the input bitstream will be used. See note below the table.	DECODE output.
FrameRateExtN, FrameRateExtD	If unspecified, values from the input bitstream will be used. See note below the table.	DECODE output.
PicStruct	Ignored.	DECODE output.

Note

If the application explicitly sets FrameRateExtN/FrameRateExtD or AspectRatioW/AspectRatioH during initialization, then the decoder will use these values during decoding regardless of the values from bitstream and does not update them on new SPS. If the application sets them to 0, then the decoder uses values from the stream and updates them on each SPS.

ENCODE Constraints#

The ENCODE Constraints table lists ENCODE parameter constraints.

ENCODE Constraints#
Parameters	Use During Initialization	Use During Operation
Width, Height	Encoded frame size.	The values must be the equal to or larger than the initialization values.
CropX, CropY CropW, CropH	H.264: Cropped frame size MPEG-2: CropW and CropH Specify the real width and height (may be unaligned) of the coded frames. CropX and CropY must be zero.	Ignored.
AspectRatioW, AspectRatioH	Any valid values.	Ignored.
FrameRateExtN, FrameRateExtD	Any valid values.	Ignored.
PicStruct	`MFX_PICSTRUCT_UNKNOWN` `MFX_PICSTRUCT_PROGRESSIVE` `MFX_PICSTRUCT_FIELD_TFF` `MFX_PICSTRUCT_FIELD_BFF`	The base value must be the same as the initialization value unless `MFX_PICSTRUCT_UNKNOWN` is specified during initialization. Add other decorative picture structure flags to indicate additional display attributes. Use `MFX_PICSTRUCT_UNKNOWN` during initialization for field attributes and `MFX_PICSTRUCT_PROGRESSIVE` for frame attributes. See the PicStruct enumerator for details.

VPP Constraints#

The VPP Constraints table lists VPP parameter constraints.

VPP Constraints#
Parameters	During Initialization	During Operation
Width, Height	Any valid values	The values must be the equal to or larger than the initialization values.
CropX, CropY, CropW, CropH	Ignored	These parameters specify the region of interest from input to output.
AspectRatioW, AspectRatioH	Ignored	Aspect ratio values will be passed through from input to output.
FrameRateExtN, FrameRateExtD	Any valid values	Frame rate values will be updated with the initialization value at output.
PicStruct	`MFX_PICSTRUCT_UNKNOWN` `MFX_PICSTRUCT_PROGRESSIVE` `MFX_PICSTRUCT_FIELD_TFF` `MFX_PICSTRUCT_FIELD_BFF` `MFX_PICSTRUCT_FIELD_SINGLE` `MFX_PICSTRUCT_FIELD_TOP` `MFX_PICSTRUCT_FIELD_BOTTOM`	The base value must be the same as the initialization value unless `MFX_PICSTRUCT_UNKNOWN` is specified during initialization. Other decorative picture structure flags are passed through or added as needed. See the PicStruct enumerator for details.

Specifying Configuration Parameters#

The following Configuration Parameters tables summarize how to specify the configuration parameters during initialization, encoding, decoding, and video processing.

mfxVideoParam Configuration Parameters#
Structure (param)	ENCODE Init	DECODE Init	VPP Init
Protected	R	R	R
IOPattern	M	M	M
ExtParam	O	O	O
NumExtParam	O	O	O

mfxInfoMFX Configuration Parameters#
Structure (param)	ENCODE Init	DECODE Init
CodecId	M	M
CodecProfile	O	O/M*
CodecLevel	O	O
NumThread	O	O
TargetUsage	O
GopPicSize	O
GopRefDist	O
GopOptFlag	O
IdrInterval	O
RateControlMethod	O
InitialDelayInKB	O
BufferSizeInKB	O
TargetKbps	M
MaxKbps	O
NumSlice	O
NumRefFrame	O
EncodedOrder	M

mfxFrameInfo Configuration Parameters#
Structure (param)	ENCODE Init	ENCODE Encoding	DECODE Init	DECODE Decoding	VPP Init	VPP Processing
FourCC	M	M	M	M	M	M
Width	M	M	M	M	M	M
Height	M	M	M	M	M	M
CropX	M	Ign	Ign	U	Ign	M
CropY	M	Ign	Ign	U	Ign	M
CropW	M	Ign	Ign	U	Ign	M
CropH	M	Ign	Ign	U	Ign	M
FrameRateExtN	M	Ign	O	U	M	U
FrameRateExtD	M	Ign	O	U	M	U
AspectRatioW	O	Ign	O	U	Ign	PT
AspectRatioH	O	Ign	O	U	Ign	PT
PicStruct	O	M	Ign	U	M	M/U
ChromaFormat	M	M	M	M	Ign	Ign

Abbreviations used in configuration parameter tables#
Abbreviation	Meaning
Ign	Ignored
PT	Pass Through
	Does Not Apply
M	Mandated
R	Reserved
O	Optional
U	Updated at output

Note

CodecProfile is mandated for HEVC REXT and SCC profiles and optional for other cases. If the application does not explicitly set CodecProfile during initialization, the HEVC decoder will use a profile up to Main10.