I'm exporting a video (DV PAL 16:9 720x576, pixel aspect ratio 1,422) for youtube, and I need to know all the differences it makes whether I export it in a 1,422 pixel aspect ratio or in 1,0 square pixels, while keeping the original 16:9 frame aspect ratio. I'm looking for answers especially for these questions:
-which one requires less space? The 1,422?
-is quality lost if I export it to 1,0? (or does this depend on the output resolution?)
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For youtube, loss of quality is a moot point - you will lose quality. Even the new 'high quality' clips on youtube aren't that great.
Also, youtube knows nothing about aspect ratio, so use square pixels or get a stretched image.
As you will be resizing down, quality loss from the resize/conversion to square pixels will be minimal. It is the conversion to youtube that will cause the real quality drop.Read my blog here.
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Originally Posted by guns1inger
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If you resize your 720x576 16:9 source with square pixels for youtube the result will be a 320x180 image letterboxed in a 320x240 frame. If you maintain the 1.422 PAR you would end up with a 300x240 image pillarboxed in a 320x240 frame.
The latter will have more picture information and less border pixels. But, as was pointed out, youtube doesn't know anything about PAR it will just display your 1.422 PAR image as square pixel. So it will look distorted. -
Originally Posted by jagabo
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Noiseless black (or any color) borders consume almost no bitrate with these types of codecs. If the the bars contain noise (like from a VHS capture of a widescreen movie) they will require some bitrate.
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