Thank you, Herman for throwing more light on this topic. Yet, reading this and other related topics I still have an impression that not every aspect or technical details of Cinrelerra are documented, known or clarified (?)
Terje J. Hanssen Herman Robak wrote: > Jeg kan prøve... > > Firstly, this has been debated before: > https://init.linpro.no/pipermail/skolelinux.no/cinelerra/2006-October/008171.html > https://init.linpro.no/pipermail/skolelinux.no/cinelerra/2006-December/009087.html > https://init.linpro.no/pipermail/skolelinux.no/cinelerra/2007-January/009680.html > http://cv.cinelerra.org/docs/split_manual_en/cinelerra_cv_manual_en_21.html#SEC310 > >> > As far as I know camcorder encoded HDV 1080i is a MPEG2 compressed 8 >> > bits video format with 1440x1080 resolution and YUV 4.2:0 croma >> > subsampling. http://en.wikipedia.org/wiki/HDV#Resolution_and_aspect_ratio >> > Grabbed from playback of a camcorder tape over Firewire will still >> > become a mpeg2 (m2t) video file on the PC HDD. > > Yep. > >> > Does Cinelerra edit and render this mpeg2 format directly or is it >> > decoded first to another format? > > Cinelerra does always decode video for display/playback. Any player > has to do that. The "format" is 4:4:4 YUV or 4:4:4 RGB, uncompressed, > with or without alpha. > > I think the right question is: "Does Cinelerra do pass-through > rendering of MPEG2 for cuts-only editing?" It only does for DV, > as far as I know. > Since MPEG2 does not have 100% independent frames with a fixed > number of bytes per frame, the editor can't just streamcopy the > desired frames. It has to recode _some of_ the frames, making > pass-through rendering a much more complex affair. > > Pass-through rendering is a highly desireable feature that I > don't expect to be implemented for HDV any time soon. Sorry. > > >> > And, does one need to encode the Cinelerra edited/rendered video >> > afterwards using ffmpeg to get a general playback HD video format (i.e. >> > MPEG2/MPEG4 for DVD/BD)? > > You _can_ use Cinelerra's own MPEG2 encoder. Since Cinelerra doesn't > output multiplexed MPEG streams, you have to either > > * render the sound and video separately, > and multiplex it manually afterwards. > > * render to a different codec (lossy or lossless) in either > an AVI, Quicktime or Ogg container, and recode that to MPEG2 > afterwards. > > >> > Is Cinelerra also capable to edit/render a more professional 10 bits HD >> > video format with 1920x1080 resolution and YUV 4:2:2 croma subsampling, >> > as soon as it is made available on the HDD? >> > http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Overview > > I doubt that Cinelerra currently supports 10bits AVC codecs. But > Cinelerra > is supposed to support 10bit uncompressed video. However, uncompressed > 10bit > HD is huuuge, so your disks may be too small for that, and certainly too > slow. > > I have had no source material to test 10bit support with, though. > And no 10bit displays either. You probably have to make an artificial > test pattern to find out, as suggested in this article on After Effects: > http://www.hdforindies.com/2006/06/after-effects-stuff-workflow-tips-and.html > > >> > Can also ffmpeg if neccessary encode this latter higher quality HD video >> > format for BD? > > I don't know. > > -- Herman Robak _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
