Configuration File Syntax
When you run nvm_iep_sci
you must provide a configuration file. A
default configuration is available at:
<top>/drive-t186ref-linux/samples/nvmedia/img_enc/enc_h264_sample.cfg
The configuration file contains parameters with values, groups or sections of parameters, and optional comments.
Parameters
Each parameter must be on a separate line. A parameter line contains the following tokens:
- The parameter name
- An equal sign (“=”)
- A value
- An optional comment
Here is an example of a parameter with a comment:
InputFile = "configs/input.yuv" # File to encode
An unknown parameter in a configuration file does not cause a failure; the parameter is ignored. An ill-formed parameter line causes the application to fail.
Comments
A comment consists of a pound sign (a ‘#’) and any following text to the end of the line. A comment may appear at the end of any parameter line, or on a line by itself.
Sections
A section is a named group of parameters, containing a specific set of parameters.
For example, the group RC_Params
contains rate control parameters.
You can define one or more RC_Params
sections and use the parameter
values they set by referring to them in the
EPRateControlSectionIndex
and EPPRCParamsIndex
parameters, described later in this topic.
Range of values that can be used for numbering sections is 1 to 9 in steps of 1.
Available section types include:
EncodePic_Params
: per-frame parametersEncodePicH264_Params
: specific H.264 per-frame parametersPayload
: different arrays of SEI payloads can be used for every picture in H.264 encodingEncodePicH265_Params
: consists of specific H.265 per frame parametersEncodePicVP9_Params
: specific VP9 per frame parametersPayloadH265
: different arrays of SEI payloads can be used for every picture in H.265 encodingRC_Params
: rate control parametersQP_Params
: quantization parameters
Each section begins with a line in the form:
[<section name> <section number>]
The rest of the section consists of parameter values to be defined in the group. A specific set of parameters may be defined in each group, as shown in Configuration File Parameters.
For example, these lines define three QP_Params groups:
[QP_Params 1]
QPBSlice = 30 # Quant. parameter for B slices (0-51) - qpInterB
QPISlice = 28 # Quant. parameter for I Slices (0-51) - qpIntra
QPPSlice = 28 # Quant. parameter for P Slices (0-51) - qpInterP
[QP_Params 2]
QPBSlice = 40 # Quant. parameter for B slices (0-51) - qpInterB
QPISlice = 38 # Quant. parameter for I Slices (0-51) - qpIntra
QPPSlice = 38 # Quant. parameter for P Slices (0-51) - qpInterP
[QP_Params 3]
QPBSlice = 50 # Quant. parameter for B slices (0-51) - qpInterB
QPISlice = 48 # Quant. parameter for I Slices (0-51) - qpIntra
QPPSlice = 48 # Quant. parameter for P Slices (0-51) - qpInterP