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using:video_filter_resize [2010/04/15 16:05] j.m created |
using:video_filter_resize [2010/04/16 19:54] j.m |
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Avisynth resize is slightly more accurate, but MPlayer resize is 3x(nbsp)faster without any perceptible difference. | Avisynth resize is slightly more accurate, but MPlayer resize is 3x(nbsp)faster without any perceptible difference. | ||
- | The filter dialog config box is the same for both filters: | + | The filter dialog config box is the same for both filters. You can direcly enter the new width/height and the resize algorithm or use the slider and the menu. |
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- | [[Image:Resize.png]] | + | |
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- | You can direcly enter the new width/height and the resize algorithm or use the slider and the menu. | + | |
In case you enter the values manually, press OK, not Apply, as pressing Apply recomputes the value from the slider position. | In case you enter the values manually, press OK, not Apply, as pressing Apply recomputes the value from the slider position. | ||
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The aspect ratio is very important for proper resizing. If the source is MPEG-1/2, you can be almost sure that the source aspect ratio is 4:3 or 16:9. AVI files are most commonly 1:1. | The aspect ratio is very important for proper resizing. If the source is MPEG-1/2, you can be almost sure that the source aspect ratio is 4:3 or 16:9. AVI files are most commonly 1:1. | ||
- | So to resize properly a widescreen DVD for example to MPEG-4 AVI (e.g. encoded with XviD), select 16:9 for source and 1:1 for destination. | + | So to resize properly a widescreen DVD for example to MPEG-4 AVI (e.g. encoded with Xvid), select 16:9 for source and 1:1 for destination. |
The framerate is also important. 4:3 MPEG has non square pixels, different for PAL and NTSC. So if you resize before altering the framerate you will end up with a differently sized image. | The framerate is also important. 4:3 MPEG has non square pixels, different for PAL and NTSC. So if you resize before altering the framerate you will end up with a differently sized image. |