4K Video on MBP: Playback Issues

I tried to run a 4K (30 fps) MP4 video on an early 2011 15" MacBook Pro with a quad core processor (Inter Core i7 2.2 GHz), 8 GB of RAM, Samsung SSD 840 PRO, an integrated graphics card (Intel HD Graphics 3000 with 512 MB of VRAM), and a discrete graphics card (AMD Radeon HD 6750M with 1GB of VRAM). Unfortunately, the video playback was not smooth and at times it would skip some of the frames. I thought the hardware on this MBP is more than enough to run the 4K video, but I am not sure why there are issues with playback.
Surprisingly, I ran the same 4K video on a 13" Retina Macbook Pro (Late 2013) and the video playback was very smooth and there were no playback issues at all! The 13" Retina MBP comes with a dual core processor (Intel Core i5 2.6 GHz), 16 GB of Ram, flash storage, and an integrated graphics card (Intel Iris with 1.5 GB of VRAM).
Does anyone know why would the 13" Retina MBP outperform the 15" MBP in 4K video playback? Thanks.

Hi there
Firstly, sinanju, yup that's a great bit of video - good quality too. My worry with it is 100MB for 5mins... means some whopping great films! I have had a brief play with other settings - so far getting reasonable quality but with interlacing issues that would need to be sorted.
TinyBeetle - excellent find, this plays my existing videos with HW support directly.. qand I like that it remembers previous positions of everything watched! - and I can rotate it 90 degrees in the 'other' direction for playback - they can't all do that.
So in conclusion, for me, BSPlayer seems to do what I need it to do, though I will keep the other players handy just in case.
(oh, and about the sound, I reckon this is a specific issue with trying to listen at low volumes, which most of the time won't be happening as I'll generally be somewhere louder and need more sound. It's still not great as it's an issue that's tehre but it's not a dealbreaker - for me.

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