-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 y0017566 schrieb: >> One thing I didn't get is whether I have to put the pre-rendered 50fps clip >> into a 25fps or 50fps project (step 6) When I re-import it without making >> changes to the project properties I get a 50fps final render clip. Also >> there are slight artifacts at edges. It looks like Aliasing, or in other >> words, like a reduced picture resolution. But I have to go on with tests. >> Perhaps I didn't observe correctly.
Hello Chris, the intermediate rendered clips from step 6 ought to have 50fps. You import it into the original (25fps) project. Make sure you'll apply the "Fields to frames" effect to this imported clip on the whole length (= step 7), i.e. drag this effect onto the imported clip in the timeline. Without this effect, Cinelerra will just pick every other frame, which means dropping half of the frames of the 50fps. Now, because this intermediary rendered clip has been created with applying the "Frames to Fields" effect in step 3, every 2nd line in this fields was actually interpolated from the neighbouring lines. The "Fields to frames" effect from step 7, when applied properly, will discard exactly these interpolated scanlines and replace them with the corresponding lines from the other 50fps half image, which happen to be not interpolated, but from the original footage. This makes the whole process basically lossless. I said "basically", because in practice there are two circumstances which can cause a (small) quality loss: - - when you use a compressed format for the intermediary clip(s). Note even MJPEG is slightly compressed. Only raw yuv video is uncompressed. - - when you apply some filer or other manipulation in the 50fps project, these effects will work on both the real and the interpolated lines. In case such an effect smears out or shifts or transports the original image information in some way, the interpolated data could leak into the original scanlines. According to my experience, both mechanisms can be observed if you look carefully, but are rather small and negligible. Cheers Hermann >> Panasonic brings some new cams to the market. The upper price class ~1000¬ >> can do Full HD and if I understood correctly, 50fps progressive too. I >> think it' s called TM350 8-) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkt2OWwACgkQZbZrB6HelLIzXwCfZ00zLneims2IcTrTNFWbteuX 0IwAn2f51f7ZQh/xywkQqU8wjXRdhd5r =ang8 -----END PGP SIGNATURE----- _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
