On Sonntag 12 Februar 2006 01:30, Ichthyostega wrote:
> Hello all,
>
> fist of all I want to express my gratitude. With cinelerra, we have a
> full-featuerd, powerfull NLE to our disposal. Great thanks to all the
> people making this a reality!
>
> Currently, we are at the start of editing and postproduction for a full
> feature independent movie we shot last summer on HDV (1080/25i using a Sony
> FX-1). Some weeks ago, we successfully captured our tapes. We can play the
> MPEG-ts files with VLC and loading them (via TOC files) into cinelerra
> works well.
>
> We would be glad to hear some advice or recommendations by the experts
> on video formats best to use.
>
> - as we want to keep the material interlaced, we need to do some mask
> operations on halfframes, render this and reintegrate it for further
> editing. What format would you recommend for such "intermediate renders".
> (Sadly enough, the original HDV footage is alredy somewhat compressed and
> we want to loose as few quality as possible)?
I thought I had sent the attached message to the list, but it doesn't appear
in the archive. It describes the workflow that I used. You will want to use a
different intermediate format. See below.
> - can you recommend any "almost lossles" or "almost not compressed" format
> that works well with cinelerra (export and re-import). This is, if we want
> "almost full quality" for preview renders, but a somewhat reduced size
> (compared with raw yuv and thus somewhat more manageable file sizes)?
You can experiment with OpenEXR. It offers some lossless compression. I
haven't used it ever.
-- Hannes
> - what are your recommendations as archieval format?
> - recommendations for proxy editing? (see my other post on this issue)
>
> any infos and help greatly appreciated.
> Hermann
>
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--- Begin Message ---
On Samstag 28 Januar 2006 20:12, Nicolas wrote:
> On Tue, Jan 24, 2006 at 09:13:19PM +0100, Johannes Sixt wrote:
> > - Work with deinterlaced footage.
> >
> > I've done a 10+ seconds shot where I had to tweak the mask at every
> > single frame. Since I grabbed it from DV, I used Fields-to-Frames to
> > "deinterlace" the frames, so I have actually 50/sec frames. I think I
> > know what I'm talking about as far as mask are concerned ;)
>
> Hannes,
>
> You advised me to work on deinterlaced footage. My project output will
> be a DVD, and I need the best quality. I though deinterlacing footage
> reduces the quality of pictures.
> However applying the masks on some parts of my projects is difficult
> when not deinterlacing the picture.
>
> What's your opinion? Must I really deinterlace the footage to mask some
> part of the picture?
You need not, if you have ample disk space. The idea is:
1. "Fields to frames"
2. apply mask
3. render
4. "Frames to fields"
5. Convert to destination format.
For my project I applied the "Fields to frames" effect using Video->Render
effect and stored the result as Quicktime YUV 4:2:0 Planar (huge!), which now
has 50 FPS (I'm in PAL land). Since the source is DV, I used "Bottom field
first".
Then I imported the resulting file and edited the mask there. I had to set the
project frame rate to 50/sec. Note that it should be possible to insert the
file in the original project (make backup copies) and copy and paste the
keyframes that you already have to the new track.
(Due to rounding errors it sometimes happens that a frame is missing and
another one duplicated in its place - I don't care.)
That's my current project state (with keyframes on virtually every single
frame).
I'd now continue to render the track into Quicktime YUV 4:2:0 Planar.
Then use Video->Render effect "Frames to fields" with Bottom field first. In
my case I could put the result into Quicktime DV, but any other format would
be acceptable that is capable to hold interlaced material (Uncompressed RGB,
for example).
Now insert the new track again into the project (set it to 25 FPS) and render
again with the sound.
-- Hannes
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