video over dlna problem


hi guys... hoping for some insight... im trying to send video from my S3 to my tv by playing it on my phone and then pressing the little button up the top left and choosing my tv.

i can send the wonders of nature (the hd video the phone came with) without any problems... it buffers and then plays fine..... same for some youtube clips i have saved to my phone.

However whenever i try to send a video i filmed on the phone itself.... it stops to buffer like every 10 seconds.

Does anyone have any ideas as to why, or more importantly how i can fix this?

many thanks