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I recently taught a couple of seminars in Los Angeles at StreamingMedia West. You can find links to the presentations at the link in the previous sentance.
I just got an email from a student asking:
At Streaming Media West you introduced the session to MediaInfo, a very handy tool, thank you. Quick question, on one video I notice that OSX “get info” gives me a different dimension than Media info does. And a screen shot shows that it is 853×480 Do you know why that might be?
Here’s the pic, with OSX on the left, MediaInfo on the right.
Here’s my response.
Let me tell you what I know, and you can tell me if it’s relevant – if you send me a short file I could confirm.
If this was a 16:9 DV file (I know it’s not), the true pixel resolution – or the actual pixels stored in the file — would be 720×480 – that’s what DV is. When displayed, though, because the pixels are stored at a pixel aspect ratio of 1.2 – you multiply the horizontal resolution by 1.2 to get the actual pixels the video consumes onscreen. 1.2 x 720 is 864, which for some reason, gets rounded down to 853.
It’s a very confusing area because of how the different products analyze and present the analysis. Bottom line is that there are 720×480 pixels in the file, but when displayed, it’s 853×480.
Here’s the response back:
Ok so another one of those square pixel, rectangular pixel situations. Ok I just got my head around that with illustrator and titling/overlays. Thanks, appreciate the quick reply.
Which is exactly correct.
