Videomizer isn't best of class, but most people don't need the burden, either in $ or learning curves or time & bother, of near best of class video software. So I'll leave what it accomplishes alone -- you can do better if you want, but if you don't want & are happy with what Videomizer offers, cool. What I do want to say is that the installation of Videomizer is a bit invasive -- IOW it's the type of video app I loath because it can break things for innocent folks. If it doesn't break anything Great, but you shouldn't be forced to take the risk without knowing that you're taking a risk.
It adds a partial install of AC3Filter -- download & install the regular app for all controls & uninstall -- that may interfere with licensed official AC3 software you already have. It adds a partial install of the Matroska Splitter [now called Haali Media Splitter] -- again download the full app if you want/need -- which admittedly some software requires, but which can also break all sorts of video-related apps & functions. It adds older webm, VP8, FLAC, Ogg, & Vorbis files, along with a slew of older HDX4 active x / dshow filters. Here are some of the ways things can get broken...
Windows handles video by trying to assemble a chain of the required components [files] -- one file to open & read the file, another to split it into audio & video, another 2 to decode each & so on. If it fails at the 1st attempt, it'll keep trying until something works, or breaks the process entirely. If an early failure loads a file, it sticks around, so it can cause problems with a file loaded later on if/when they're incompatible.
Windows decides which files to try 1st when assembling those chains because of something called merit. Many [most?] of these files have a merit rating, & the higher that rating, the higher it's rank, & the more likely it is to be used before any other. SO instead of using what's really preferred on your system, Windows &/or software may load a HDX4 filter, which may or may not work, or may not work as well.
In other cases Windows has only a single solution that it will use, rather than trying to build a chain by essentially trial & error. An invasive app like Videomizer can add a file that replaces what Windows uses now, & that file may not work, or not work nearly as well. The odds of that sort of thing happening increase the older the files included with the app are, & many of those that come with Videomizer are pretty old.
Now if you just installed Windows, had no other video &/or audio software, didn't use any of Windows built-in media apps etc., Videomizer would likely be OK. The more video &/or audio software you've added, &/or the more you depend on Windows default media handling, the greater the risk of something becoming broken.
If you have problems try renaming or removing the folders with HDX4 &/or Ogg etc., probably in the Common Files folder. You can do the same with ac3filter.ax in the program's folder, or install the full version & see if the controls help, or then uninstall it. The same goes for MatroskaSplitter.ax in the System32 folder in C:\Windows. The CodecTweak Tool *may* help. If you can't get something working again, & you don't have a backup you can restore, the LAVFilters *may* help. If you want to keep one or more HDX4 files, Filmerit lets you set the merit for most everything installed. You can find all the files referenced at videohelp[.]com.