Can't get sed regex to work

Download the mp4 file:
cd /tmp
wget http://0x2a.org/leet/imagecacher/cache/1417986015.9261.mp4

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I am trying to get the match [0-9]{1,3}x[0-9]{1,3}, please see: http://www.regexr.com/3a2vi

A correct match with the correct output is done with:
ffmpeg -i /tmp/1417986015.9261.mp4 2>&1 |grep Stream |grep Video | grep -oP '[0-9]{2,4}x[0-9]{2,4}'

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Answer: 320x240

However, this does not work:
ffmpeg -i /tmp/1417986015.9261.mp4 2>&1 |grep Stream |grep Video | sed 's/.*\([0-9]\{3,4\}\)\w's/.*\([0-9]\{3,4\}\)\w\([0-9]\{2,4\}\).*/\1\2/'\([0-9]\{2,4\}\).*/\1\2/'

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Answer: 320240

How to I use sed to get the answer I want? What am I doing wrong?
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itniflAsked:
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ozoCommented:
ffmpeg -i /tmp/1417986015.9261.mp4 2>&1 |grep Stream |grep Video | sed 's/.*[^0-9]\([0-9]\{2,4\}x[0-9]\{2,4\}\).*/\1/'
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Gerwin Jansen, EE MVETopic Advisor Commented:
The 'why' is for one that your pattern does not contain an x but a w ;)
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itniflAuthor Commented:
Gerwin: No, you are mistaking.
The "\w" means "any word character" which usually means alphanumeric (letters, numbers, regardless of case) plus underscore (_)

This here shows ozo is correct, but her regex also works when using the \w instead of the x:
Sed with w and with x - same result
Ozo:
Edited my reply here. I understand your regex fully now, thanks :)
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