2007 October 24th, 18:52
Shooting a music video, need some slow motion help please!
I've got a music video shoot comming up which about 40% of the footage will end up slow motion.
I understand that its better to film in 50i for slo mo's but I also want the normal speed shots in 25p.
So do i:
shoot the whole thing in 50i then convert the bits i want to 25p?
shot the bits i think i will slo mo in 50i and the bits i want normal at 25p?
or shoot each shot twice in 50i & 25p?
My dilema is if i change my mind about what i want to do with a shot, will converting a 50i shot to 25p look as good as filming in 25p? and if i film everything in 25p i want get the good slo mos.
thannks for any help
2007 October 24th, 19:09
Unless you can say for sure what's going to be slowed down and what not, I'd recommend shooting completely in 50i. Higher shutter speeds would be better for the slowmo scenes but no so good for the normal shots (unless you're after the 'Gladiator/Saving Private Ryan' look). But from my experience, a shutter speed of 50 is enough for most slowmo shots.
You just can't get perfect slowmotion from 25p. Some may disagree, but I'm talking about nice slowmotion without the need of artificial interpolated frames. So you'd have to shoot the slowmotion scenes in 50i and deinterlace to 50p (to slow them down to 25p) anyway. This diminishes quality a little, but by shooting the rest of it in 50i and deinterlacing it to 25p you'll get exactly the same image quality for both the normal and the slowed down shots. And, as you say, you can always choose later.
BTW, I'm assuming you want to slow down to exactly 50%...anything else is not smooth.
2007 October 24th, 19:20
thanks for that rapid response fletch78! thats definetly some useful info!!
2007 October 24th, 22:07
I agree with everything Fletch said except I would double the shutter speed.
2007 October 25th, 05:04
yeh ian-T i think uping the shutter is a good idea, I have searched around and it seems like the good slo mos have higher shutter.
fletch, how do i convert 50i to 50p? so if i slow it down 50% does that make it 25p?
2007 October 25th, 08:10
Last edited by Fletch78; 2007 October 25th at 08:22.
2007 November 8th, 07:20
hey Fletch, just tried your method with TMPGenc 4.0 XPress and it works a treat!!
So I'm gonna shoot the whole thin in 50i.
Thanks for the help guys.
2007 November 10th, 16:44
Where can i find this?
Originally Posted by Fletch78
EDIT: ok found it!
Last edited by ForwardLooker; 2007 November 10th at 16:54.
2010 April 10th, 13:17
Sorry for bumping such an old thread, I have TMPGEnc Express and I've been trying to convert some 50i footage to 50p. I've used the settings mentioned by Fletch78 above but I've ended up with a huge (2.8gb) file from a 40mb source file from a hv30. the file is almost unplayable on my laptop, very jerky playback and it appears to be in 4:3 format after conversion.
Can anyone help please?