Video Playback not working Sony MP4 Player

Aleatoire

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Sep 25, 2009
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Hi, I've had a Sony NWZ-E438F 8GB MP4 player for a while now and I've only just got round to trying to find out why some MPEG-4 movies won't play on it.

I've got some movies on my PC that I wan't to have on my MP4 but after transferring them onto it, I get a message telling me that I can't play them.
They are in MPEG-4 format. This only happens with some videos, not all of them.

Any ideas why this is happening?
 
Wait, how is this illegal?
If it's illegal to put movies on my MP4 player then why does it play MPEG-4 files?
And I haven't linked to anything, I only asked a question.

EDIT: Unless you mean it's illegal to put actual "movies" on my MP4 because thats not what I meant (I should have phrased my question slightly better). I was talking about drum covers of songs by a guy called Cobus Potgieter which are completely copyright free. In fact you can download them from his website if you don't believe me.