Ichthyostega schrieb:
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Hello Chris,
sorry for not responding more quickly ;-)
y0017566 schrieb:
I just want to learn how it is done the real way....
Hello Hermann,
don't mind. You see it did take me even longer to respond. I was abroad
to get some new film footage. I also tried a bit with Interlacing. It's
a complex task to me but it's getting better!!
My intention is to create great slow motion effects. It doesn't matter how
long it takes or whether I have to do pre-renders. I already have a lot of
pre-renders done with ReframeRT because my machine is too slow to playback
and I need an accurate timing because I'm cutting to audio
The online manual of cinelerra contains a short list with instructions
how to process interlaced material with increased framerate. I'm just
pasting it here for convenience.....
http://cv.cinelerra.org/docs/split_manual_en/cinelerra_cv_manual_en_14.html#SEC192
= Processing interlaced footage without deinterlacing =
1. Create a new project with doubled frame rate. I.e make it 50fps
if your source footage is 25i
2. Insert your source footage onto a video track in the timeline.
Now, Cinelerra will playback each frame of your footage twice.
3. Apply the "Frames to Fields" effect. Be sure to choose the correct field
order. Typical values beeing "bottom field first" for DV and
"top field first" for HDV.
4. Then apply any further effects afterwards, including translations,
scaling, slow motion, precise frame-wise masking or use of the
motion tracker plugin.
5. Render your project to a intermediate clip. Be sure to choose a rather
lossless video codec, e.g. Motion-JPEG-A or even uncompressed yuv if
you have plenty of storage.
6. Insert the intermediate clip into your original project. Make sure the
doubled framerate has been detected correctly by Cinelerra (by looking
in the clip's media info in the media resources folder)
7. Apply the "Fields to frames" effect to the intermediate clip. This will
combine two adjacent fields into one interlaced field with the original
frame rate.
8. Do the final render on your original project
Note: unfortunately the naming of the effects was choosen exactly the wrong
way round, related to the usual terms. "Frames to Fields" takes /fields/
(half images) and expands them to /full frames/, interpolating the missing
lines.
Thanks for the Instruction!!
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.
I just have tried to playback a cinelerra render with vlc. There are some
still images inserted. They look fine with "X" but SHIVER badly with "Bob"
and "Linear".
This shows that the field order is messed up somehow. VLC uses the information
embedded in the header or just plain guesses the right field order, based on
the filetype.
The field order tells you which of the interleaved lines comes first, and which
second. You can always check it if you look at a single frame (export it to an
lossless image file like *.png !). If this frame contains an object moving in a
known lateral direction, you should be able to see the offset and deduce the
field order from there.
Typical values are "bottom field first" for DV video and "top field first" for
HDV video.
In an ideal world, it would be possible to shoot 4k 70 fps progressive and
the software would just handle it in a breeze. Well, dreaming ;-)
hehe, eventually sometime :)
yeah, we just need to get ahead with Lumiera :-D
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
Hope to read sth. from you soon,
Chris
Cheers,
Hermann
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