A.8.3, Why do some thumbnail icons look wrong – NewTek TriCaster Advanced Edition User Guide User Manual
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A.8.3 WHY DO SOME THUMBNAIL ICONS LOOK WRONG?
Some file formats (notably AVI) do not provide embedded aspect ratio information. As a result, their
thumbnail image in Media Player icons for may not be properly proportioned. Generally the problem does
not extend to playback (the DDR will ‘guess’ the aspect ratio correctly).