This is part of MSU Video Quality Measurement tool Online Help for MSU VQMT 13.0
MSU Video Quality Measurement Tool (MSU VQMT) project:
- Main MSU VQMT page on compression.ru
- Download & Purchase on compression.ru
- Basic information
- Online help
- Metrics reference
- Version history & Changelog
Online help for MSU VQMT 13.0 contents:
- Command-line help
- VQMT various lists and tables
- Usage of VQMT metrics in CLI
- Picture types
- Configuration description
- List of documentation pages for all versions
Content
The configuration is a JSON file that fully specifies VQMT computation settings. It specifies the set of files, the set of metrics, and calculation settings. You can use the configuration file instead of a classical CLI configuration (for any computational purpose, excluding getting help, specification and activation). Using the configuration file is possible in command via the specifying -config
option. Also, it is possible to read the configuration JSON from STDIN using -config-stdin
. The configuration is available only in the CLI interface in PRO/Premium edition.
-
version - This configuration file version (optional)
Syntax: [integer,integer]
First integer for major version, second one for minor. Supported versions:
- 12.1
- 13.0
Default: [13,0]
-
files - List of all input files. The first will be treated as the original one for reference metrics
Syntax: [A, ...]. A possible values: One of:
- “string”
- [“string”, {object}]
The string is always file name. Possible keys for the object:
- mode - (string) - explicit mode for reading a file. Default: “auto”
- index - (string) - index mode
- index_file - (string) - index file. For some index modes will be skipped
- props - (object) - additional properties, specific for mode and file
- range - (array) - specify array of one element - [N] to skip N frames. Specify array of two elements [N, M] to select frames from N to M inclusive
- stdin - (bool) - specify true, if the file should be read from stdin
- offset_type - (string) - if range specified, the way for seeking target frame
-
metrics - List of metrics to perform
Syntax: [A, ...]. A possible values: {object}
-
metric - Metric to perform
Syntax:
One of:
- “string”
- {“name”:”string”, “device”:”string”}
- {“name”:”string”, “variation”:”string”}
Run VQMT with
-list json metrics
arguments to see the list of all available metrics. Each metric can be uniquely identified by it’s name and variation -
color - The color component to perform metric. You can specify only one component per element.
Syntax: “string”
Run VQMT with
-list json metrics
arguments to see the list of all available metrics with supported color components -
config - Metric configuration (optional)
Syntax: {object}
Run VQMT with
-list json metrics
arguments to see the list of all available metrics with available configuration settingsDefault: {}
-
vis-gamma - Gamma correction value for visualization (optional)
Syntax: null or A, where A possible values: float
Default: null
-
vis-colormap - Colormap for visualization (optional)
Syntax: null or A, where A possible values: “string”
Default: null
-
-
output - Settings for writing JSON ans CSV files
Syntax: {object}
-
enabled - Turn on/off saving output
Syntax:
One of:
- true
- false
Default: true
-
output_directory - Output directory for saving CSV and JSON (supports VQMT environment variables)
Syntax: “string”
Default: “?(InputOriginalDir)”
-
name_generation_type - Scheme for default naming of output files (CSV, JSON)
Syntax:
One of:
- “prefix”
- “postfix”
- “custom”
Default: “postfix”
-
custom_name - Custom name for output files (supports VQMT environment variables). Only considered if the scheme is CUSTOM
Syntax: “string”
Default: “”
-
csv_separator - Separator for starting new cell in the output CSV file
Syntax:
One of:
- ”;”
- ”,”
Default: “,”
-
fp_separator - Separator for starting fractional part in floating point numbers for the output CSV file
Syntax:
One of:
- ”.”
- ”,”
Default: “.”
-
save_csv - Turning on/off sabing CSV
Syntax:
One of:
- true
- false
Default: false
-
save_json - Turning on/off saving JSON
Syntax:
One of:
- true
- false
Default: false
-
json_legacy - Switching to JSON format of older VQMT releases. Currently supported: 11
Syntax: integer
Default: 13
-
json_file - Explicit name of the JSON file (supports VQMT environment variables). If set and not empty, has a priority over other specifications. It will override custom_name if set
Syntax: “string”
Default: “”
-
csv_file - Explicit name of the CSV file (supports VQMT environment variables). If set and not empty, has a priority over other specifications. It will override custom_name if set
Syntax: “string”
Default: “”
-
json_stdout - Enabling/disabling saving JSON to STDOUT instead of a file. Do not use with json_file
Syntax:
One of:
- true
- false
Default: false
-
-
vis - Settings for writing visualization
Syntax: {object}
-
enabled - Turn on/off saving visualization for all metrics
Syntax:
One of:
- true
- false
Default: false
-
output_directory - Output directory for saving visualization (supports VQMT environment variables)
Syntax: “string”
Default: “?(InputOriginalDir)”
-
name_generation_type - Scheme for default naming of visualization files
Syntax:
One of:
- “prefix”
- “postfix”
- “custom”
Default: “postfix”
-
compressor - Compressor name for visualization files. See also the list of all compressors
Syntax: “string”
Default: “h264”
-
preset - Preset for setting compressor mode
Syntax: “string”
Default: “mq”
-
caption_position - Place for printing caption over the visualization (if some data are printed)
Syntax:
One of:
- “left-top”
- “left-bottom”
- “right-top”
- “right-bottom”
Default: “left-top”
-
write_value - Turning on/off printing metric value on each visualization frame
Syntax:
One of:
- true
- false
Default: true
-
write_frame - Turning on/off printing frame number on each visualization frame
Syntax:
One of:
- true
- false
Default: true
-
gamma - The default gamma correction value for visualization. Can be overwritten by each metric individually by specifying the metric setting
Syntax: float
Default: 1.0000000000000000
-
colormap - The default color table for visualization. Can be overwritten by each metric individually by specifying the metric setting
Syntax: “string”
Default: “”
-
-
conversion - Settings for interpreting samples of input files
Syntax: {object}
-
standard_name - Color standard that will be used to find exact colorspace for files, where metadata not sufficient to specify exact colorspace
Syntax: “string”
Default: “BT.709”
-
full_range - Is quantization range PC (full range, 0..255 in case of 8-bit samples). Quantization range will be used to find exact colorspace representation for files, where metadata not sufficient to specify coded data quantization range
Syntax:
One of:
- true
- false
Default: false
-
display_lum - Display luminance for some HDR colorspaces and metrics. This will be treated as the luminance of a maximum white pixel of an input file. This value will be also used in some metrics as maximum. Value is integer in the range 1..10000
Syntax: float
Default: 10000.000000000000
-
sample_conv - The way an integer sample will be converted to continuous
Syntax:
One of:
- “shift” - 0xFF means 0.996 (255/256)
- “repeat” - 0xFF means 1.0
Default: “repeat”
-
legacy_mode - Emulation of an old VQMT mode. It affects some metrics and conversion algorithm. Do not use with other settings of this section
Syntax: integer
Default: 0
-
disable_UV_upscale - Disabling upscaling of chroma components (U, V for YUV pixtures types) to Y size for subsampled formats (YUV420, YUV422, etc.)
Syntax:
One of:
- true
- false
Default: false
-
-
bad_frames - Settings for bad frames
Syntax: {object}
-
enabled - Turn on/off saving visualization for all metrics
Syntax:
One of:
- true
- false
Default: false
-
dir - Directory for saving bad frames (suports VQMT environment variables)
Syntax: “string”
Default: “?(InputOriginalDir)”
-
count - Total (maximum) number of bad frames to be saved
Syntax: integer
Default: 10
-
distance - The minimum distance that bad frames can be (frames)
Syntax: integer
Default: 0
-
type - The criterion for the selection of bad frames
Syntax:
One of:
- “origproc”
- “procproc”
- “firstbetter”
- “secondbetter”
Default: “origproc”
-
format - Image format for saving bad frames
Syntax:
One of:
- “BMP”
- “TIFF”
Default: “TIFF”
-
high_threshold_enabled - Is high threshold enabled
Syntax:
One of:
- true
- false
Default: false
-
low_threshold_enabled - Is low threshold enabled
Syntax:
One of:
- true
- false
Default: false
-
high_threshold - High threshold. A frame with a metric value equal to or better than this will never be considered bad
Syntax: float
Default: 0.00000000000000000
-
low_threshold - High threshold. A frame with a metric value equal to or worse than this will never be considered bad
Syntax: float
Default: 0.00000000000000000
-
naming_type - Scheme for default naming of bad frames image files
Syntax:
One of:
- “frame”
- “file”
- “custom”
Default: “frame”
-
custom_name - Custom name for bad frames image files (supports VQMT environment variables). Only considered if the scheme is CUSTOM
Syntax: “string”
Default: “”
-
-
geometry - Settings for geometry correction
Syntax: {object}
-
enabled - Turn on/off geometry correction. If off, all files mush have the same resolution. Also, geometry correstion can be used to downscale inputs for increasing performance
Syntax:
One of:
- true
- false
Default: false
-
size - Target size for resizing or cropping input images
Syntax:
One of:
- “orig”
- “1/2 orig”
- “1/4 orig”
- “min”
- “max”
- “custom”
Default: “orig”
-
width - Target width if size is custom
Syntax: integer
Default: 1920
-
height - Target height if size is custom
Syntax: integer
Default: 1080
-
strategy - Strategy, that specifies resampling, cropping and ratio preserving
Syntax:
One of:
- “scale”
- “scale+crop”
- “crop”
Default: “scale”
-
algorithm - Image resampling algorithm
Syntax:
One of:
- “nearest”
- “bilinear”
- “bicubic”
- “lanczos”
Default: “bicubic”
-
antialiasing - Is antialiasing while resampling enabled
Syntax:
One of:
- true
- false
Default: false
-
prefer_ffmpeg - Use FFmpeg scaling algorithm if available. If false, Intel algorithm will be always used
Syntax:
One of:
- true
- false
Default: true
-
-
mask - Mask specification for indication of the most important areas of the image
Syntax: {object}
-
mask_type - Type of mask to be aplied
Syntax: [“string”, “string”]
Possible types:
bin
black
- binary mask, black for ignored areasbin
white
- binary mask, white for ignored areas8bit
black
- 8-bit mask, black for ignored areas8bit
white
- 8-bit mask, white for ignored areasincl-rect
<rect spec>,excl-rect
<rect spec> - mask consists of rectangle (included or excluded). <rect spec> is;
-separated list of measurements in the order: top, right, bottom, left. Each measurement can be pixel value or percent value (floating point) if followed by ‘%’ sign. A negative value can be used to measure from the opposite side.
Default: [“no”,”mask”]
-
mask_file - A mask file if maskType considers a file. Could be static image or video file
Syntax: One of:
- “string”
- [“string”, {object}]
The string is always file name. Possible keys for the object:
- mode - (string) - explicit mode for reading a file. Default: “auto”
- index - (string) - index mode
- index_file - (string) - index file. For some index modes will be skipped
- props - (object) - additional properties, specific for mode and file
- range - (array) - specify array of one element - [N] to skip N frames. Specify array of two elements [N, M] to select frames from N to M inclusive
- stdin - (bool) - specify true, if the file should be read from stdin
- offset_type - (string) - if range specified, the way for seeking target frame
Default: “”
-
-
subsampling - Skipping frames for increasing performance
Syntax: {object}
-
enabled - Is subsampling enabled. Subsampling could be used for some metrics to skip frames for increasing performance
Syntax:
One of:
- true
- false
Default: true
-
do_target_fps - Whether subsampling takes into account target_fps setting. If false, value for every_nth_frame will be taken for subsampling
Syntax:
One of:
- true
- false
Default: false
-
every_nth_frame - Number of frames that will be skipped after each processed frame plus one. This value will be taken into account only if do_target_fps is False. Value 1 means no subsampling (each 1st frame is processed)
Syntax: integer
Default: 1
-
target_fps - Processing FPS, that VQMT will try to achieve skipping frames
Syntax: float
Default: 25.000000000000000
-
enable_seek - Allow VQMT seek in the input files. If false, VQMT will read all intermediate frames
Syntax:
One of:
- true
- false
Default: false
-
-
performance - Performance tuning and information
Syntax: {object}
-
threads_number - Number of threads for performing VQMT tasks. VQMT can spawn additional threads
Syntax: integer
Default: 0
-
slots_number - Number of slots that be allocated for each metric to process files simultaneously. `0` - default value. Increasing this value will slightly increase memory consumption, but can improve concurrency
Syntax: integer
Default: 0
-
metric_parralelism - How many instances of a single metric can work simultaneously. `0` - default value. Set small values to reduce memory consumption. High metric parallelism is quite useless if you computing many metrics simultaneously
Syntax: integer
Default: 0
-
show_performance - Whether information about VQMT performance will be displayed instead of results
Syntax:
One of:
- true
- false
Default: false
-
forced_length - The expected number of frames (0 to disable). This parameter affects only progress bar
Syntax: integer
Default: 0
-
-
verbosity - Verbocity level. Affects on amount of messages, generated by VQMT
Syntax:
One of:
- “silent”
- “default”
- “all”
Default: “default”
This page is automatically generated by 13.0 beta r12626 on 2021-02-05. In case of any question or suggestion, please mail us: video-measure@compression.ru
-
MSU Benchmark Collection
- Super-Resolution for Video Compression Benchmark
- Video Colorization Benchmark
- Defenses for Image Quality Metrics Benchmark
- Learning-Based Image Compression Benchmark
- Super-Resolution Quality Metrics Benchmark
- Video Saliency Prediction Benchmark
- Metrics Robustness Benchmark
- Video Upscalers Benchmark
- Video Deblurring Benchmark
- Video Frame Interpolation Benchmark
- HDR Video Reconstruction Benchmark
- No-Reference Video Quality Metrics Benchmark
- Full-Reference Video Quality Metrics Benchmark
- Video Alignment and Retrieval Benchmark
- Mobile Video Codecs Benchmark
- Video Super-Resolution Benchmark
- Shot Boundary Detection Benchmark
- The VideoMatting Project
- Video Completion
- Codecs Comparisons & Optimization
- VQMT
- MSU Datasets Collection
- Metrics Research
- Video Quality Measurement Tool 3D
- Video Filters
- Other Projects