QCTools Automation Scripts

This repository contains scripts for automating analysis of QCTools reports.

Overview

Install from source:

• Create a new Python Virtual Environment for qct_parse
  • Unix based (Mac or Linux):
    python3 -m venv name_of_env
  • Windows:
    py -m venv name_of_env (where 'name_of_env' is replaced with the name of your virtual environment)
• Activate virtual env
  • Unix based (Mac or Linux):
    source ./name_of_env/bin/activate
  • Windows:
    name_of_env\scripts\activate
• Install Package
  • Navigate to the repo root directory path/to/qct-parse/
  • Run the command:
    python -m pip install .

Test Code

If you intend to develop the code for your proposes or contribute to the open source project, a test directory is provided in the repo.

• Activate virtual env (see Install from source)
• Install pytest pip install pytest
• Run tests python -m pytest

Building the documentation

• Activate virtual env (see Install from source)
• Install sphinx and myst-parser pip install sphinx myst-parser
• Run sphinx-build command sphinx-build ./docs ./dist/docs

Commands:

• qct-parse -i/--input [path to QCTools report] [optional arguments]
  Finds frames that exceed thresholds for QCTool tag(s). Full list of command line arguments below.

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qct-parse

Run a single tag against a supplied value or multiple tags using a profile.

Arguments

Argument	Description
-h, --help	Show this help message and exit
-i, --input	Path to the input qctools.xml.gz or qctools.mkv file
-t, --tagname	The tag name you want to test (e.g., SATMAX); see table of tag names below for list
-o, --over	Threshold overage number
-u, --under	Threshold under number
-p, --profile	Compare frame data against tag values from config.txt. Use -p default for QCTools default values
-buff, --buffSize	Circular buffer size. If even, defaults to the next odd number (default: 11)
-te, --thumbExport	Enable/disable thumbnail export (default: off)
-ted, --thumbExportDelay	Minimum frames between exported thumbnails (default: 9000)
-tep, --thumbExportPath	Path to thumbnail export. Uses input base-path if omitted
-ds, --durationStart	Start analysis from this time (seconds, equivalent to ffmpeg -ss)
-de, --durationEnd	End analysis after this time (seconds, equivalent to ffmpeg -t)
-bd, --barsDetection	Enable/disable bar detection (default: off)
-be, --barsEvaluation	Use peak values from color bars as 'profile' if bars are detected
-pr, --print	Print over/under frame data to console (default: off)
-csv, --csvreport	Print summary results to a csv sidecar file
-q, --quiet	Suppress ffmpeg output in console (default: off)

Tags

Tag category	Tag names
YUV values	YMIN,YLOW,YAVG,YHIGH,YMAX UMIN,ULOW,UAVG,UHIGH,UMAX VMIN,VLOW,VAVG,VHIGH,VMAX
YUV values (difference)	YDIF,UDIF,VDIF
Saturation values	SATMIN,SATLOW,SATAVG,SATHIGH,SATMAX
Hue values	HUEMED,HUEAVG
Temporal outliers	TOUT
Vertical line repetitions	VREP
Broadcast range	BRNG
Mean square error fields	mse_y,mse_u,mse_v,mse_avg
Peak signal to noise ratio fields	psnr_y,psnr_u,psnr_v,psnr_avg

Examples

Run single tag tests

qct-parse -t SATMAX -o 235 -t YMIN -u 16 -i /path/to/report.mkv.qctools.xml.gz

Run bars detection using default QCTools profile

qct-parse -bd -p default -i /path/to/report.mkv.qctools.mkv

Export thumbnails of frames beyond threshold

qct-parse -p default -te -tep /path/to/export/folder -i /path/to/report.mkv.qctools.xml.gz

Use peak values from detected color bars as thresholds

qct-parse -bd -be -i /path/to/report.mkv.qctools.xml.gz

Input files

qct-parse.py will work with the following QCTools report formats:

qctools.xml.gz qctools.mkv

If the qctools.xml.gz report is in an MKV attachment, the qctools.xml.gz report file will be extracted and saved as a separate file.

Both 8-bit and 10-bit values are supported. The bit depth will be detected automatically, and does not need to be specified.

Config Files

The provided profiles are:

• default
• highTolerance
• midTolerance
• lowTolerance

Each of these profiles contain the following tags with a corresponding threshold:
YLOW, YMAX, UMIN, UMAX, VMIN, VMAX, SATMAX, TOUT, VREP

The profiles are stored in the config.txt files. Please note that there is a separate config.txt for 8-bit and 10-bit values.

The process for providing user supplied profiles is in development.
Currently, if you wish to create your own profile, you will need to create your own config directory and config.txt file.
There is a environmental variable at the top of qct-parse.py which can be used to reset the config directory:

CONFIG_ENVIRONMENT_VARIABLE_NAME = 'QCT_PARSE_CONFIG_DIRECTORY'

Simply place the full path to the user created config directory in place of 'QCT_PARSE_CONFIG_DIRECTORY'

Thumbnails

Thumbnails of failed frames will be exported if the -te flag is invoked.

In order to export thumbnails, the QCTools report must be in the same directory as the video file it is describing, and must have the same file name as the report (excluding the qctools.xml.gz).

If you would like to provide a path for exporting thumbnails, you can do so using the -tep flag.
Otherwise, thumbnails will automatically be created in the same directory as the video file and QCTools report, in a new directory.

When running qct-parse with a profile, the thumbnails will be placed in a directory named ThumbExports. When run against single tags the directory will be named [TAG NAME].[THRESHOLD]

Logging

A log file is created with the same name as the input file but with a '.log' extension.
For example: some_video_file.mkv.qctools.xml.gz.log

Log files contain every instance of values over the specified threshold. For example:
2024-10-03 17:02:35,737 SATMAX is over 181.02 with a value of 698.0 at duration 00:00:16.4500

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Legacy Commands:

Not in active development. Please file an issue if you are interested in using these.

makeqctoolsreport

A Python port of Morgan’s makeqctoolsreport.as, this script generates QCTools .xml.gz reports from input video files.

Example Usage:

makeqctoolsreport /path/to/input.mxf

overcatch

A script from the original qct-parse development for running a report against multiple profiles.

Example Usage:

overcatch /path/to/input.mxf

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Dependencies

Ensure Python 3.x.x is installed.

Requires FFmpeg.

This tool uses the lxml python module which is automatically installed with the qct-parse package.

For more information on lxml usage, check out the lxml documentation.

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Contributors

• @eddycolloton
• @CoatesBrendan
• @av_morgan

Maintainer

• @av_morgan
• @eddycolloton