On Tue, 18 Dec 2007 15:28:27 +0100, Terje J. Hanssen <[EMAIL PROTECTED]>
wrote:
Hi,
I hope to get more clarification on this for me somewhat diffuse topic:
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
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