Resources

QScan FAQs

Answers to common questions can be found here.
If you'd like a detailed answer to a technical question, ask our fantastic community on the Forum.

Miscellaneous

What is QScan?

QScan is an Automated Quality Control Solution.

- QScan does not require internet connection (only needed for the online activation)

- Preferred browser is Chrome.

Using QScan you can select files to be checked, against a set of parameters (a parameter 'template').

Which type of QC does QScan perform on the A/V content?

QScan performs an analysis of the technical characteristics, format parameters and the perceptual quality of media content. QScan focuses on the verification of formats, metadata (such AS-11 metadata information) and the effects and artefacts resulting from successive manipulations of the content, such as black frames, freezing, video levels, audio silence, etc.

Also allows to verify compliance to international standards, such as IMF or DCP packages, and now HDR measurements for MaxFALL and MaxCLL verification.

What differentiates QScan from other products?

QScan presents a whole new set of unique features, such as Single Pass Analysis, Comparative Analysis, Macros, unique visual IMF representation, HDR measurements, and more. These features, combined with the easy visual UI, and the new flexible payment model, makes QScan the most affordable, fuly featured and user friendly AQC in the market. AQC will never be limited to Pro users with the new monthly, yearly or outright licenses with different flavors to adapt to any budget. The only AQC in the world that you can get for FREE. Democracy has finally arrived to the AQC world.

What are the main advantages of QScan over other QC titles?

The new GUI reduces the complexity of a very technical task as the Quality Control

  • New ready made templates according to industry delivery specifications, for ease of use, even in the Free version.
  • Single Pass Analysis, that allows to update results in just a matter of second when changing thresholds (quality criteria) in the project configuration.
  • Compliance with worldwide technical standards
  • Avoid long and inefficient QC processes based on human intervention
  • Macros allow users to create their own customized quality thresholds (conditions) such as “identify only black frames that also have audio silence”
  • QC speed faster than real-time
  • Availability of an API for integration into third-party applications
  • Modular, scalable architecture with simple load balancing
  • Based on web technology
  • New Comparative Analysis that allow to compare different versions of the same file and seek for quality differences
  • HDR analysis compliant to all existing HDR standards, and with advanced video measurements
  • IMF Package support.

Why do I need to automate QC?

If you are a content producer, broadcaster, etc., the automation of content QC will enable you to minimize manual QC, saving significant investment in time and resources. Human inspection (i.e. 'eyeballing') is not capable of detecting or providing an objective measurement of all errors or artefacts that exist in the content.

In which languages is QScan available?

QScan is available in English, although it does support the UNICODE standard for extended character sets (Korean, Japanese, Chinese, etc.). By using translation files, QScan can currently be adapted to any other language. Available translation files can be downloaded from the Settings/System menu option in QScan.

Does QScan make use of GPUs (graphics processing units, Nvidia for example) for the processing?

QScan solely makes use of the CPU.

GPU use is in our roadmap and it is expected to be available by Q2 2022.

I need to QC a high volume of files. Can QScan address that?

Yes. QScan MAX can process 4 files concurrently per server (node). You can expand beyond 4 by setting up additional MAX nodes. Contact sales@lwks.com for further information.

What are the minimum and recommended Hardware Specifications for QScan?

QScan requires a Windows machine - version 7 and newer, including Server versions. This machine can also be virtual, running on Mac / Linux.

The interface can be accessed locally via a web browser (Chrome recommended). It can also be accessed remotely, from any machine on your network, running any OS and web browser.

Recommended for optimal speed (Real Time speed) up to 4 files at a time per QScan machine: - 16 core machine - Minimum 8GB of RAM - 1TB HDD: will depend on whether QScan machine is also used for the content storage.

Optimally SDD in RAID configuration. - 1GbE ports NOTE on Ethernet ports: the bitrate of the files that are to be QC'ed needs to be considered.

The required ethernet speed will depend on the file bitrate, the amount of simultaneous files, and the expected analysis speed. I.e: if we want to analyze 4 ProRes@220Mbps, 2 times faster than real time, and we do not want the networks to be the bottleneck, the network speed should be 4x220x2=1760Mbps (1.7Gbps)

You can check the HW requirements in our HW guideline document that can be downloaded from here: https://app.lwks.com/downloads/documentation

Which web browsers enable working with QScan?

QScan may be executed from any browser, however, the recommended browser is Google Chrome.

Does QScan work in a Virtual Machine Environment?

QScan may be executed on virtual machines. It is merely necessary to ensure that the virtual machine is configured to have access to the network shares that need to be accessed to read the files (if any). QScan has been tested in VM environments such as VMWare, Virtual Box, Parallels, Hyper-V. Please contact us to know more about supported VM environments.

Can QScan be used with Linux or MAC OS?

QScan cannot be executed natively in these operating systems, it is compatible with MAC through a virtual machine or Boot Camp and with Linux through a virtual machine.

Can QScan be integrated into third-party systems?

Yes, QScan has its own API which enables integration of the QC in third-party systems such as: ingest systems, encoders, transcoders, MAMs, playout systems, correction systems, etc. The API is fully documented. For more information, please contact sales@lwks.com

I don´t know the size of the QScan system I should use, can you recommend?

The first question to answer is: how many hours of analysis will be needed per day (or week, month)? As a 'worst case' scenario, if we assume that QScan can analyze at Real Time Speeds (that is true up to HD resolutions), 1 simple license of QScan (1 file at a time) would be capable of analyzing 24 hours of material in a day, thus the basic license consisting of 4 files at a time, will be capable of analyzing 96 hours per day, assuming 24x7 use, and that the HW and network are enough for those speeds.

Taking this as the bottom line, the faster the machine, the bigger the amount of content that could be analyzed per day. So, if we aim at analyzing 125 hours of content per day, 125/24=5,21 files at a time (considering 24x7 operation). So, it would be necessary to analyze more than 5 files at a time. Thus needing additional worker nodes. NOTE: performance can vary depending on the Hardware, file formats, file bitrate, parameters to be analyzed, etc. Heavy file exchange formats (DNxHD, ProRes, XAVC, J2K, etc) might take longer than traditional broadcast formats (MPEG2, H264, HEVC, etc).

Does LWKS supply hardware?

LWKS does not provide Hardware to be used with QScan. You can see the recommended minimum requirements in the download page https://app.lwks.com/downloads/documentation

What support or assistance will I receive?

The support you will receive depends on your licensing. Generally, Free and One licenses can only get support through the forum https://forum.lwks.com/#qscan-aqc.574

To know more details about support options according to the licensing you can check the License Comparison web page https://lwks.com/qscan-tech-specs/

The email address for support: support@lwks.com

Operation

Which parameters does QScan analyze?

QScan analyzes different types of parameters:

  • Format Parameters: assure that you will deliver with the right format
  • Perceptual quality parameters: avoid artefacts in your video or audio, missing audio and a whole set of other problems
  • MXF metadata
  • IMF packages integrity
  • Audio loudness
  • and now with HDR measurements of MaxFALL, MaxCLL and gamut!

You can see a complete list of parameters on the QScan Tech Specs page https://lwks.com/qscan-tech-specs

Can QScan perform the QC of files which only contain audio?

Yes, although QScan is designed to perform the simultaneous analysis of audio and video, it is possible to configure the analysis solely for audio. Likewise, in the configuration process for QC projects it is possible to choose solely audio QC.

How many audio channels is it possible to analyse with QScan?

QScan can analyze up to 16 audio channels simultaneously. It is possible to analyse mono, stereo, 5.1 and 7.1 audio channels.

How long will QScan take to carry out a full QC analysis of a file?

This will depend on various factors such as the speed of your CPU and the file formats to be analyzed. It is recommended that i7 or superior processors be used for QC tasks. We currently possess benchmarks achieved using different processors and different file formats. As a reference, it may be indicated that a 10 minute XDCAM HD file would take 6 minutes to analyse using an i7 processor and 4GB RAM.

Check out the HW Guidelines documentation that can be downloaded from the download page: https://app.lwks.com/downloads/documentation

Is it possible to prioritize files?

Yes, QScan allows you to set analysis priority 'per file' and 'per project'. There are three levels of priority (High, Normal, Low).

Can QScan be configured from different time zones?

QScan can be configured to any time zone.

Apart from detection, does QScan do any corrections to the content?

No, QScan only does analysis of media files. No correction is included in any of the license options.

Can QScan do compliance checking?

Yes, QScan complies to most adopted standards. These include: AMWA, DPP, SMPTE, etc. QScan also provides a complete set of ready made templates that comply to most industry delivery specifications, to guarantee that your content will be accepted by major companies such as Netflix, Amazon, iTunes, etc.

Does QScan enable the analysis of live sources?

No. QScan is not a monitoring tool, but rather an Automated Quality Control tool intended for file based content.

What happens if I want to analyze a very large file?

QScan has been tested with very large files. File size will only impact on the time that is needed to perform the analysis. Furthermore, QScan Max enables workload to be distributed across multiple nodes (or QC servers). The 'Partial Analysis' feature enables you to analyze files in chunks of the selected duration, and thus processor load can be distributed across multiple nodes.

What learning resources are available for QScan?

The 'Getting Started' document describes the first steps https://app.lwks.com/downloads/documentation

Check out the QScan "hints and tips" category in the forum. We periodically post new entries aimed at helping you getting the best out of QScan https://forum.lwks.com/forums/hints-tips.601/

How do I ensure that the files reach QScan in order for it to work with them?

The files to be analyzed in QScan must be available in the local drives or the repositories which are configured in the initial system configuration (Only Pro and Max). These files may be on the local machine where QScan is located or in folders on the workplace LAN.

In order to create repositories: Settings > Repositories > Create Repository.

When subsequently creating a project, watch folders would be selected within the available repositories.

Check out the hints and tips entry in the forum https://forum.lwks.com/threads/configuration-of-repositories.243594/

How many different templates can I have?

The number of templates which can be used in QScan depends on your license.

  • QScan Free: only Vimeo, YouTube and 3 custom made templates
  • QScan One: Vimeo, YouTube, some additional default templates, and up to 10 custom made templates
  • QScan Pro: all default templates and unlimited custom made templates
  • QScan Max: all default templates and unlimited custom made templates.

Does QScan support the analysis of growing files?

Growing files would never work for all file formats, since not all of them allow reading the file before it is complete. So, QScan does not support growing files. Files need to be completely copied to a folder accessible by QScan prior to the analysis. QScan will detect the file even if it still being copied, but the analysis will not start until the file copy/move is complete.

Licenses

How is QScan licensed?

QScan licensing model is very simple. Check the comparison table on the QScan Tech Specs page https://lwks.com/qscan-tech-specs

How can I try QScan?

As an entry point to the product, QScan is now available for FREE, with limited features and templates. However, for a more in-depth trial of all high end features, our new month plans are available at super-affordable prices. If you are a big company, and you are interested in our outright options, contact sales: sales@lwks.com for a tailored plan.

How do I get the QScan FREE version?

Follow the steps below to get started with QScan Free:

  • Register on https://lwks.com to create a LWKS account.
  • Download and run the QScan installer.
  • In your browser (Chrome recommended) visit the URL: http://localhost:8080
  • Sign in with the following username/password: admin/admin.
  • Click on 'Settings/Licenses'. Enter your lwks.com (LWKS) credentials in the online activation section.
  • Click 'Save'. Select 'Download License' to collect and apply your FREE license.
  • You can also find complete instructions here: https://app.lwks.com/downloads/qscan

Does the QScan FREE license expire?

When you collect and apply the FREE license, it runs for 30 days. At the end of 30 days you will need to repeat the collection process:

  • Go to the 'Settings / Licenses' page,
  • Enter your LWKS credentials
  • Click 'Save' and select 'Download License'.

The 30 day cycle will start again.

What restrictions does the FREE version have?

The FREE license allows you to QC your media using our 'Quick Analysis' option: select a file, select a template, Go! The number of ready-made templates is limited. The number of custom templates is also limited to 3. Only HTML reports are available. Custom templates have some restricted parameters.

Does QScan use a dongle or software for the granting of licenses? How is a license extended?

No, QScan licenses are purely software licenses. For extension of an existing license, if you purchased a monthly or annual license, and you enabled the subscription option, a new license will be automatically generated and updated in the application once the payment has been confirmed. You can purchase new month/annual licenses in the app - https://app.lwks.com/buylicenses NOTE: if you are interested in outright licenses, please contact sales@lwks.com

How can I transfer a QScan license to a new PC?

In order to transfer the existing license to another machine, you will need to:

  • Deactivate the current license in QScan GUI (settings/license page)
  • Send the generated thumbprint to support@lwks.com indicating the username you chose when registering on www.lwks.com.
  • In the new machine, Follow the Free license activation process described on the Downloads > QScan page.
  • We will then enable the license in the new machine, that you can update following the installation instructions, also found on the Downloads page.
crossmenu