Question [Q] AOSP ROMs video playback ability

Hi,

I have one problem with AOSP roms and I consider this as the biggest one.
I have a Galaxy S3 I9300 running Stock 4.3 deodexed, zipaligned etc.

Now with this ROM I am able to play almost all types of video files...Why is this not possible with AOSP roms?

I have always seen people installing different types of Apps (MX Player, VLC Player etc. etc..) to get all the videos playing...
But TouchWiz plays almost all types of videos out of the box...As of now I don't have any third party video player installed on my phone...

I am a big fan of CM, but refrain from installing it just because of this one reason!

Can someone please explain this to me...would be great !!
And please correct me if i am wrong...

Thanks.

Samsung Galaxy S III (I9300) Running....

OS: [ROM] [4.4.2] [Stock] [Sammy] [N7100 Port] ArchiPort | Beta | Buggy | WIP
Theme: Darkydroid

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