22 September 2017 | 28,190,827 Downloads | 5,432 Reviews | 314,673 Members | Login or Register

RSS Feeds

Receive a regular RSS feed from our latest, most popular and recommended downloads

Latest downloads feed

Get a regular RSS from our most latest downloads

Most popular downloads feed

Get a regular RSS from our most popular downloads

Recommended downloads feed

Get a regular RSS from our recommended downloads

Newsletter

Subscribe to either one of our two newsletters for regular updates and information

Downloads newsletter

This is a weekly newsletter with download news, updates and other information

This is a monthly newsletter with software store information, offers and deals

QCTools 0.9

Automatically analyse video quality

by Mike Williams

Our Rating:
Your Rating:
Login to rate
Based on 0 ratings
License: Open Source
Operating Systems: Linux, Mac OS X, Windows 10, Windows 7 (32 bit), Windows 7 (64 bit), Windows 8, Windows Vista (32 bit), Windows Vista (64 bit)
Requirements:
Languages: English
Software Cost: Free
Date Updated: 17 August 2017
Watchlist: Add download to my watchlist
Downloads To Date: 203
Developer: MediaArea
RSS News Feed:
Twitter Feed: https://twitter.com/MediaArea_net
Facebook: https://www.facebook.com/MediaAreaNet
Back up your data with Acronis True Image 2016 with a 1-PC LIFETIME license, only $34.99, saving 50%, from store.pcauthority.com.au
QCTools
Automatically analyse video quality

QCTools ("Quality Control Tools for Video Preservation") is a free and open-source package for analyzing video quality.

The program is aimed at professionals, but it could help anyone compare video codecs and conversion programs, or just measure the quality of your chosen footage.

Drag and drop one or more videos on to the program and it immediately begins processing them. This is a frame-by-frame task and can take a long time - a 150 second video took 120 seconds to analyze on our test system - so it's wise to start with something short.

When the process is complete, QCTools displays a table with a list of low-level technical measurements related to the video - Yav, Yrang, Uav, Vav, TOUTav, TOUTc, SATb, SATi, BRNGav, BRNGc, MSEfy and more - and a separate Graph View displays how these change over time.

If you're not a video analysis expert then you'll have no idea what any of these mean, but hovering your mouse cursor over each column header displays occasional help (Yrang is a measure of contrast, SATb and SATi are counts of frames with illegal colour values, TOUT - temporal outlier - finds pixels with significant differences from their neighbours). The Help file's "Getting Started" section also has some explanations that anyone can understand.

The Graph View displays changes in these values over the time of the video, which is handy. If there's an unusually high count of illegal colour values, say, you can look at the graph, see where the spike is, drag to that point and see the frames around it.

The developer claims these figures are an objective measure of video quality, but is this true? To find out, we took some source 1440p videos and created multiple lower quality versions using different codecs, resolutions and bitrates. Then we passed them to the program, and watched as the program went to work.

The results were interesting, with the TOUT figures in particular proving a very accurate measure of quality. Sources with a lesser codec, bitrate or resolution always showed an increase in the TOUT values.

It's possible we might have had different results with other source videos, so we'd recommend you carry out your own tests. But it does seem likely that QCTools can give you objective measurements of video quality, making it easy to compare multiple files and identify which one is best.

Verdict:

QCTools is aimed squarely at video professionals, but it's not difficult to use, and could be handy to anyone who needs to measure or compare the quality of digital video.

Your Comments & Opinion
 
Related Download Articles
 
Vidiot

Vidiot 0.3.19

Open Source

A simple(-ish) home video editor

Tube Explorer

Tube Explorer 3.2

Trial Software

Browse, download and convert videos from YouTube, Google Video and Yahoo Video and more

Other Download Articles From This Category
XnView

XnView 2.42

Freeware

Powerful graphic viewer and conversion tool

ProgDVB Standard

ProgDVB Standard 7.20.5 (64-bit)

Free, for personal-use only

Enjoy digital and internet TV and radio with this one-stop entertainment system

ProgDVB Standard

ProgDVB Standard 7.20.5

Free, for personal-use only

Enjoy digital and internet TV and radio with this one-stop entertainment system

Bulk Image Downloader

Bulk Image Downloader 5.13.0.0

Trial Software

Automatically download entire web galleries in minutes with this time-saving internet tool

PC & Tech Authority Software News

Please wait while my feed loads

See more posts...

Our Price: $19.95
RRP: $49.99
Saving 60%
Buy Now
Offer Ends In:
 

Spotlight: Free Full Software

WhatsApp Messenger 2.17.51

Free Full Commercial Software

WhatsApp Messenger is the world's most popular instant messaging app for smartphones.

You can use it to send and receive text and voice messages, photos, videos, even call your friends in other countries, and because it uses your phone's internet connection it might not cost you anything at all (depending on whether you'll pay data charges).

It's easy to set up and use. There's no need to create and remember new account names or pins because it works with your phone number, and uses your regular address book to find and connect you with friends who use WhatsApp already.

You can talk one-to-one or in group chats, and because you're always logged in there's no way to miss messages. Even if your phone is turned off, WhatsApp will save your messages and display them as soon as you're back online.

There's plenty more (location sharing, contact exchange, message broadcasting) and the app is free for a year, currently $0.99/ year afterwards.

What's New in Version 2.17.51

• When typing text in a chat, you can tap and hold to select the text and easily bold, strikethroughor italacize it.

[...]
Value:
Free
Rating: