Help Video won't play?

[motog]

My moto g 3gen will play videos that I have recorded but when using my Chromecast a message appears saying 'sorry can't play this video'
Yet, older videos I have recorded will play to the chromecast fine, even stuff copied from and recorded on another phone.
I normally play stuff through Gallery and video player. I have tried some other apps but no result. VLC will sort of play it but breaks up (pixelated) terribly.
What's going on!

Alan

 

[AMOCO]

If Chromecast is anything like my Roku,It will only play like...MPEG-4,AVI.,
This is because it uses its own player.
Now to VLC,Make adjustments in the VLC setting to fix the pixel issue.

Edit: Or are casting to Chromecast from your phone?,If so just make the adjustments to VLC player.

 

[motog]

Thanks, all the files I am trying to play are mp4 - my new ones (last few days) won't go to Chromecast, older mp4's play fine. All play OK on phone.
I will try vlc again, what might I have to tweak to get it working OK with my Chromecast?
I just don't understand why I have to use vlc at all when it all used to work well!

Alan