On Tue, Mar 11, 2003 at 10:55:48PM -0800, Shane Wegner wrote:

[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html] On Mon, Mar 10, 2003 at 07:32:21PM +0000, Stephen Mollett wrote:

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On Monday 10 Mar 2003 18:38, Shane Wegner wrote:

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In encoding a 16:9 DVD movie, I get the following from mplayer when playing the actual dvd. VIDEO: MPEG2 720x480 (aspect 3) 29.97 fps 12250.0 kbps ... VO: [null] 720x480 => 854x480 Mpeg PES Why the two resolutions?

The file is actually 720x480, but because it's 16:9, if you displayed it at 720x480, it would come out 'squashed' horizontally on a 4:3-aspect monitor. So it's scaled up to 854x480 to compensate.

Makes sense, thanks.

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Now when I play the encoded avi with lavc, the aspect ratio changes. Movie-Aspect is 1.97:1 - prescaling to correct movie aspect. VO: [null] 720x366 => 720x366 Planar YV12 why has the aspect ratio changed?

The aspect ratio has changed because you've cropped the black bands and thus changed the height. Aspect ratio for square pixels = (width/height):1

Hmm, I tried without the cropping and get this.

VIDEO: [DIVX] 720x480 24bpp 23.98 fps -17179870.0 kbps (-2097152.0 kbyte/s) ... VDec: vo config request - 720 x 480 (preferred csp: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.50:1 - prescaling to correct movie aspect. VO: [null] 720x480 => 720x480 Planar YV12

So where the original aspect was 16:9, it appears to have changed to 3:2. Am I doing something wrong or is this just the way it should be?

You should either rescale Y so the aspect will be 2.33 (854/366) which means rescale Y to 720/2.33 = 309, you should choose a close multiple by 16, say 304. this way you don't have to use "aspect=", if you want to have 720/366 resolution (with cropping) use -lavcopts aspect=2.33:(and the other options you encode with). 720/480 is 3:2

Thx, Shane

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