dramatic slow motion with 60i

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dmitriandsnow

Well-known member
Alright i have learned from the search that playing back 60i at 23.976fps will yield approximately 40% slower footage. My testing showed that such slow motion is not evident to an unaware eye. My footage was shot at 1/120th shutter speed. In timeline i have selected interpolate fields and disable resample. I wish for a more dramatic slow motion. I have tried altering the playback rate and i was wondering what is the "ideal" slow motion play back rate to match my 60i footage. I figure since there is the "ideal" shutter maybe there is a certain playback rate i should select?
Thank you guys!


Also what exactly happens when play back rate is slowed? Does Vegas play same frames more than once? Is this a terribly lossy process?
 
You need to use a VELOCITY ENVELOPE to slow the motion down. I suspect you are just setting your frame rate to 23.976fps, which will NOT result in slow motion. Try setting the velocity envelope to 50%, in which case your resolution will be reduced, but the slow motion will be optimized for smoothness.
 
Playing back 29.97fps material at 23.976fps does result in slower motion.
What is the difference between velocity envelope and play back rate?

EDIT:I found out (again via search) particularly Barry's post that velocity envelope in this case is 40%. I think there should be a sticky written by someone who cares and who is able to.
Thanks
 
If you play back 29.97 material using a framerate of 23.976, you do not get slower motion, you just sample your source at a lower rate.
 
Thanks guys! What does "sample your source at a lower rate." mean?
In theory i always thought shooting higher frame rates and playing back at lower fps would yield slower motion....
 
Suppose you shoot 30 frames per second (your source footage) and play back at a framerate of 24 fps. The playback will be at normal speed (not slow motion)at 24 fps, but you must sample the source at a lower rate (24 frames per second) compared to the source footage sample rate (30fps) because the number of frames per second in playback is less than that of the source footage.
 
I've tried both ways (velocity envelope and stretching the event) and both work yet my audio remains original speed, unslowed. I've dropped my footage into 29.97, 24, and 23.976 fps timelines. What might I be doing wrong?
 
Try right-clicking the audio clip you want to change, and select properties, then in "Time Change/Pitch Shift" select "classic". Then change the length of the clip to the new length (and select the pitch change box), you will see the pitch change in your audio.
 
Ed Troxel set me straight on this. I hope it's ok if I quote him:

"When I place a clip on the timeline, I get a video event and an audio event on two tracks. If I hold down the CTRL key and resize the video event, the audio event also changes. If that is not happening, look for a couple of things:

1. Make sure "Ignore Event Grouping" is NOT turned on.
2. Make sure they are still grouped

There is no velocity envelope for audio so matching in that case will be a much tougher situation. You can still do the CTRL resize on the audio part but it will be a constant speed change. Alternately you could take it into Sound Forge and make the corresponding speed changes."

:thumbsup:
 
If I am understanding correctly what you want to do, you should still be able to get the pitch change in Vegas. For example, I took a 60i video clip and put a 50% velocity envelope on it, then stretched it to twice its timelength (so that the full original footage would play). I then split the audio at the midpoint, and stretched it (2x) to the end of my video clip (now audio and video terminate at same point in time). I then right-clicked the audio event, selected "classic" time stretch/pitch change and checked the pitch change box (the new length should be 2x the original length). This procedure gave me audio synched to the video, but at the explected lower pitch due to 1/2 speed playback. Normal pitch can be obtained by unchecking the pitch change box (but is still synched with the video).
 
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