Deinterlacing and frame rate
by Michael Amundsen
on
Jun 16, 2008 at 7:38:49 pm
How do I deinterlace footage in after effects. And is it possible to convert the frame rate from 25fps to 24fps, and will these techniques some how make something that was shoot in 50i look more like film(24p)? (please be gentle with me and use words I'm likely to understand, since I'm neither much of a film geek nor English speaking)
Re: Deinterlacing and frame rate by Kevin Camp on Jun 16, 2008 at 8:41:07 pm
what you can do within ae (no additional plugins):
- with footage selected in the project window, choose file>interpret footage>main...
- set ae to conform the frame rate from 25 fps to 24 fps and to separate fields (proper order) and check the box for preserve edges.
- take that into a 24 fps comp and you'll see how it looks.
personally, i feel like you could bypass the conforming frame rate part and just separate fields, and i would definitely leave it at 25 fps if your destination is 25 fps...
there are also better deinterlacing plugins (fields kit by revisionfx is nice) if you need them, but ae can do and ok job.... enabling frame blending (frame mix, rather than pixel motion) for the footage layer within the comp can help smooth the movement and hide some deinterlacing artifacts, if needed.
Re: Deinterlacing and frame rate by Chris Wright on Jun 16, 2008 at 9:20:00 pm
Deinterlacing quality all depends on your budget. We'll start at $0 and go from there.
1. Timewarp with recursive on 50 and high smooth lines 1000, export with interlace. micro blur...
2.ae's separate fields, but put the footage into a comp that is double the frame rate (if the footage is 29.97, make the comp 59.94). speed problems...
3.http://www.videocopilot.net/tutorials.html?id=58
using psd file for field separate. spacing problems
4. Premiere Pro has an interpolate new fields deinterlacer export. quality pixels connecting problems
5. use free virtualdub with deinterlacing filters like TomsMoComp or smart deinterlacer, not smart enough, too rough
6. buy revision's fieldskit around $80, good, micro blur
7. buy magic bullet frames around $200, good, slightly choppy
8. algolith algosuite around $1,000 crazy good, crazy expensive
best quality for best price is revision's fieldskit edge corner with blend 50i to 25p then use ae's timewarp or revision twixtor
98.95833
% slower with extreme filter on to go 25p to 24p and enable time remapping for audio sync.
Re: Deinterlacing and frame rate by Chris Wright on Jun 16, 2008 at 11:18:34 pm
*Thanx for great help, guys.
*Is there any reason to film in 50i and convert to 25p in *post if I can film in 25p. Or rather - is there a difference?
Most camcorders don't save in progressive format. Most use interlaced dv footage, interlaced mpeg2 footage. Some semi-progressive camcorders support reverse 3:2 pulldown which takes the interlaced 29.97 fps and turns it into 23.976p which is 24 fps 1% slower, just like why recording hollywood movies the sound is at 30 fps to 29.97 so when post house puts edl ref editing picture on dv tape, it gets slowed down too. Then everything matches.
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50i is like our 60i
50i to 25p deinterlaced
and 60i to 30p but you don't have to worry about 30p to 24p temporal.
All you have to do is take 25p and slow it down 4% to 24p; audio too.
If there is a 25p digital camera, then try to find one that is true progressive, not interlaced and doesn't use mpeg2 4:2:0. Recovering p from i can sometimes create problems. Temporally, excluding any blur or artifacts, true p always seems to look better. A prime example is panasonic's dvx100. It may, in post-editing, finally get to 24p, but the distance a person travels compared to the recording frame is never constant. That is why when there is small motion, it still looks like a soap opera and fast motion it gets weird. There's no true constant interval. Only film has a constant interval of time and space. That is why blur looks so good in film. Hopefully an exception is coming out soon, the red dot camera that shoots RAW 24 fps; a bunch of still camera pics mushed together.
Re: Deinterlacing and frame rate by Kevin Camp on Jun 17, 2008 at 5:51:29 pm
if you want progressive and can shoot in 25p, then that is your best bet. you'll save time and your footage will look better (no artifacts, softness, or loss of vertical resolution). many cameras can shoot progressive frames at standard broadcast frame rates (usually by recording both fields simultaneously).
unless your destination is film, i'd say that would be the best way to go.
if you were going to film, you could look into an hd camera that can shoot 24p... if it shoots to tape, you'll just need to remove the pulldown, if it shoots to file, then you can usually set the camera to record only the progressive frames, but you'd have to check the manual for specifics....
