Invisor

Just installed the v3.11 (to Yosemite 10.105 iMac).
It works quite well and displays all the relevant media information I was hoping it would.
The big plus is the "Comparison" tab on the main window, which allows for several same or similar media to be compared in column fashion.
As well, it has a "Highlight differences" check-box which grays-out the same specs and draws attention to the differences. Which is what I was most looking for in the program.
(You could do it in a sort of 'blink-comparison' mode shifting between two files, in this and some similar apps, but the actual Highlight differences here is much easier to work with I think.)

One other little feature I just noticed, is that at bottom right of the window, it shows the total time (sum) of all the media files you have dragged into the examination list column (on the left side).

Re. the separate Invisor Quicklook app program.
I did have to manually open the package on the Invisor QuickLook.app and drag copy the InvisorQL.qlgenerator from it to the /Library/QuickLook folder, to get it to show Finder Quicklook previews. Maybe it was because I had an older version there which I had forgotten about... Oh well, no worries, the InvisorQL.qlgenerator v3.2 is working fine.

The QuickLook Generator stopped working for me recently - all I get are 10 screenshots now - no information.
It's useless to me without that.

I emailed the dev. yesterday morning and have not yet received a reply.

A newer version of MediaInfo library (0.7.95) was released yesterday.

Great app and better as most of the free or paid alternatives. I tried several of them. There is a free lite version if you just download (not purchase) at macupdate.com or you can download from the developers website to test before you buy. It has a very tidy user interface, but with features like to compare several files next to each other and it is very fast. Additionally it shows EXIF information and not only Video File information.

Tons of free alternatives. It offers no extra value. Avoid.

Now I wish I hadn’t bought this because the paid version has a more or less useless way of displaying the data about 2 or more movies — you cannot view them simultaneously! It only shows data about one movie at a time, and you have to click on the other movie’s icon to then switch to its report (all by itself). So to compare the 2 movies, you have to click back and forth between them and can never see info about both of them at the same time! Dumb. Back to VideoSpec, which puts them all together side-by-side on a large sheet so you can easily compare data on multiple movies.

Thank You, Thank You, Thank You [spoken with a jim Neighbors accent], I love it! One thing I wish for, though, is a single-window view for multi-file analyses — à la VideoSpec, which for me, is the standard. But, Invisor's faster, and more often than not, that's what I'm after. Nevertheless, FREE always wins the day, so the fight goes to......VideoSpec!! Excellent effort though.