On 16/11/10 19:24, [email protected] wrote: > Thank you Monty for your clear and informative explanations !
> You're right - as usual. > I did a little test to know if I could avoid colorspace conversions, and if > not, how much loss it would induce. I'm quite new to this, so in principle I wouldn't be very worried about the quality loss per conversion stage. However, it also happens that I'm a bit of a psycho with this kind of thing, so I've done some tests recently. Basically I loaded into Cinelerra the best quality encoding I had available and rendered it to YUV 4:2:0 planar. Then I re-encoded it to mpeg4 using the same quantisers. Visual comparison of the three clips revealed nothing initially. Rendering the same frames to pngs and comparing them with imagemagick did show clear differences after "stretching" the contrast. Once I learned what to look at I could spot the changes by flipping between frames quickly. My (obviously subjective) conclusion was that I can withstand two conversion steps quite happily for my own use case. Jose _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
