Is there any user research or testing on the smallest size a 16:9 video could play on a website, where the user doesn't feel it's too small?
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1In pixels? Millimetres? – MSalters Apr 19 '13 at 10:38
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1What is on the video? Talking heads? A movie? Text? – Kit Grose Apr 21 '13 at 8:28
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Percentage, too. – David Clarke Apr 22 '13 at 1:56
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In pixels I guess as the video will be on screen. The content in them will be sports news and match highlights. – Santi May 12 '13 at 23:21
Where the user doesn't feel it's too small?
This is subjective and would vary by person, age-group, and screen real estate percentage. My assessment is that no one likes to see small video - unless it was in bad quality and watching it in large (or full screen) size would make the video visually punishing.
... OR you were watching a video and working at the same time.
The MPEG-1 Code has the smallest resolution of an NTSC video stream as: 352x240. When converted from a 4:3 aspect ratio to a 16:9 aspect ratio, it becomes 352x198.