[MPlayer-users] HD movies, aspect ratio, and scaling

[belcampo]

Tobia Conforto wrote:
> Hi
> I have a couple of questions about a HD movie. I would like to better understand scaling issues.
> 
> The movie clip is WMV3 anamorphic 1440x1080 and my monitor has a 1440x900 resolution with square pixels. I'm using MPlayer OS X Extended rev12 (mplayer r29777)
> 
> The first issue is that ffwmv3 doesn't detect the aspect ratio of the movie clip. I guess that's a bug with FFMpeg.
> 
> So I go ahead and add the -aspect 16:9 option, and this is what happens:
> 
> Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> SwScaler: reducing / aligning filtersize 5 -> 4
> SwScaler: reducing / aligning filtersize 5 -> 4
> SwScaler: reducing / aligning filtersize 1 -> 1
> SwScaler: reducing / aligning filtersize 5 -> 4
> [swscaler @ 0x100ff60c0]BICUBIC scaler, from yuv420p to rgb24 using MMX2
> [swscaler @ 0x100ff60c0]using 4-tap MMX scaler for horizontal luminance scaling
> [swscaler @ 0x100ff60c0]using 4-tap MMX scaler for horizontal chrominance scaling
> [swscaler @ 0x100ff60c0]using n-tap MMX scaler for vertical scaling (BGR)
> [swscaler @ 0x100ff60c0]1440x1080 -> 1920x1080
> VO: [corevideo] 1440x1080 => 1920x1080 Packed YUY2  [fs]
> 
> Why is it software-scaling the movie horizontally, up to 1920x1080? 
It's playing at the original resolution, which goes partly off-screen in 
your case.
  Can't it just play the 1440x1080 source in a 1440x810 window, using 
the hardware overlay? If that's not possible, wouldn't it be more 
efficient to down-scale vertically to 1440x810?
-f 'fullscreen' will give you the intended 1440x810 being 16:9, what the 
original aspect-ratio was.
> 
> Tobia
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