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davidmarli a écrit a écrit :
ok, bon j'ai essayé : film NTSC entrelacé resize en 640x464 (ou quelkque chose comme cela) 8fps pour la première passe et 10-12 pour la seconde (avec divx 5.0.2)
je suis assez déçu concernant la vitesse (P3 850) je fais bien plus avec mpeg2avi, mais c'est vrai que la qualité est sans comparaison.
Poiur le resize quel est le meilleur choix (fast, sharp ... ?)
Merci
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Ben, Bicubic resize est à mon avis le meilleur pour réduire (moins de pertes de détails)
Je te quote l'aide
(tu l'a pas regardée ou tu ne lis pas l'anglais)
Code :
- BicubicResize
- BicubicResize([b,c,]target-width,target-height,clip)
- BicubicResize([b,c,]source-left,source-top,source-
- width,source-height,target-width,target-height,cli
- p)
- BicubicResize is similar to BilinearResize, except that instead of a linear filtering function it uses the Mitchell-Netravali two-part cubic. The parameters b and c can be used to adjust the properties of the cubic. With b = 0 and c = 0.75 the filter is exactly the same as VirtualDub's "precise bicubic," and the results are identical except for the VirtualDub scaling problem mentioned above. The default is b = 1/3 and c = 1/3, which were the values recommended by Mitchell and Netravali as yielding the most visually pleasing results in subjective tests of human beings. Larger values of b and c can produce interesting op-art effects--for example, try b = 0 and c = -5.
- If you are magnifying your video, you will get much better-looking results with BicubicResize than with BilinearResize. However, if you are shrinking it, you are probably just as well off, or even better off, with BilinearResize. Although VirtualDub's bicubic filter does produce better-looking images than its bilinear filter, this is mainly because the bicubic filter sharpens the image, not because it samples it better. Sharp images are nice to look at--until you try to compress them, at which point they turn nasty on you very quickly. The BicubicResize default doesn't sharpen nearly as much as VirtualDub's bicubic, but it still sharpens more than the bilinear. If you plan to encode your video at a low bitrate, I wouldn't be at all surprised if BilinearResize yields better quality.
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Edit pour Marvin054 : Ben... Regarde bien tous ses posts :ange: |
