In particular, what setting should I use for HDV clips when editing in Vegas and saving to x264. When I use the default setting the image becomes 4:3 when it should be 16:9
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In mpeg4-avc terminology (which is different than standard historical mpeg2 terminology) , SAR is the sample aspect ratio - but it's called PAR historically or pixel aspect ratio . I'm going to confuse you and introduce another term, FAR or frame aspect ratio which with the w:h of the actual frame dimension . These terms are called different names by different official publications, but the math is the same. That is the bottom line
Display Aspect Ratio = Frame Aspect Ratio x Sample Aspect Ratio
16/9 = 1440/1080 x 4/3
Aspect Ratio = (w:h of frame dimensions) x (w:h of pixels)
FYI, Historically in MPEG2 terminology:
DAR = display aspect ratio
SAR = storage aspect ratio (frame size)
PAR = pixel aspect ratio (shape of individual pixels)
Display Aspect Ratio = Storage Aspect Ratio x Pixel Aspect Ratio
Note the confusion here: SAR can be either storage aspect ratio or sample aspect ratio . There is no right or wrong, both governing bodies have used different conventions, although MPEG2 came out first. All the official specs for blu-ray etc. use AVC terminology , so they use Sample Aspect Ratio , not Storage Aspect Ratio. If they stuck with conventional terminology, there would be no confusion
The bottom line is the ratios and math are the same , regardless of what you call the terms
Last edited by poisondeathray; 21st Jul 2010 at 09:52.
Please, PAR, You've gone too FAR, this is really really DAR, after all I am your SAR, stop, or I'll tell MARCorned beef is now made to a higher standard than at any time in history.
The electronic components of the power part adopted a lot of Rubycons.
I'm looking to understand this as well, I have a 1280x720 source that I encode to 720x480 as I want to watch it in SD on my PC. I figure encoding it to 720x480 will give my SD encode more pixels to work with rather than going directly to 640x360? This should allow me to set my player to a PAR to 32:27 which will actually playback at 640x360. Am I flawed in my thinking?
very, and bizarre to boot. why the heck re-encode 720 to watch it at 480 on a pc. 720 will play it fine, any software will resize it to the monitor.--
"a lot of people are better dead" - prisoner KSC2-303
All that assumes your player is set to keep the aspect ratio. If you have the player set to ignore the aspect ratio it will stretch the video to fit the window or monitor. Or whatever other behavior you have it set to.
Last edited by jagabo; 12th Oct 2011 at 08:34.
Thanks guys, It does sound strange but playback ability aside. I believe since I want to watch it in SD encoding at 720x480 vs 640x360 will result in more pixels thus better quality.
Last edited by jagabo; 12th Oct 2011 at 11:26.