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Sony vgeas slow motion problem
Hey all,
I’m a bit new to sony vegas, but i have a problem with the slow motion.
When i ctrl-click and drag or add the velocity envelope, the video goes to slow-motion, but it has its peaks: slow, fast, slow fast, slow fast.
When i stretch the clip i can see a curve behind the vid in the screen, i think that one might have to do something with it. Is there any ways to straigthen that curve? Cause the clip is not at the same speed over the time i put it.I hope this question is clear, cause my english isn’t supergood :p
Thanks on advance,
Tim -
4 Replies
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Tim, the only way the clip could change speeds is if you altered the Velocity envelop to do it.
Otherwise it should play at a constant speed.
As far as the “curved” lines are concerned. do you mean that it looks like a sawtooth?
If so, this is normal as it’s the way that Vegas tells you that you’ve done something to the clip. -
Hey man,
Thanks for the info so far. Yes, i meant the sawtooth curve.
Anyways, i uploaded an example so you can see what i mean.
The slow motion isn’t really fluently: https://www.youtube.com/watch?v=WtW9pI-8bqw
Is this really normal?THanks again,
Tim
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Do you fully understand what “key frames” are? … “no?”
There should be an “FX” tab on the trailing end of this clip.
Clicking the FX tab should open an FX control/prebiew box.
“Hover” your cursor over all the various (tiny) navigation buttons.
Notice you can create/delete/goto various key-frames (markers)
The FX control values can be set at a specific level/value for the frame you are looking at (when parked on a key-frame marker …
… the clip will “ramp” or “gradually change” the values om a “linear slope” between existing key-frames marker values.Your problem is that you created unintended markers and values, so.
1st delete all key-frames in the FX cntrl box clip timeline. Start at the beggining of clip and “delete frame” .. goto all frames and delete them … making sure to include the very 1st & last frames.
Assume you desire a constant 50% normal speed over entire clip (yes?)
Go to the very beginning of clip & set speed to 50% and then click the “create key-frame” button. You have now told Vegas you want to “start off this clip at 50% normal speed”. Vegas will “look ahead” and gradually ramp (slope) to match the value(s) of the next key-frame on the clip timeline.
So navigate to the very last frame on the clip, deleting any frames that may exist, in the middle, along the way. … Create aother new key-frame at the very last frame of your clip and also set the speed controls (there) at 50% (&/or any other “tweakables” or values that a given effect might employ).
You have now told Vegas to start the effect at the 1st frame w/50% normal speed and to ramp toward the next marked frame value. That next marked frame should now be the very last frame in your clip and, since you have assigned the exact same value to the last frame (with no changes, in between), there is no “slope” or “change”. …
The entire clip should now render at a constant 50% normal speed.It should now be obvious that if you were to navigate to somewhere in the middle of the clip and create a new key-frame and (while you are parked exactly on that frame) and set the speed to 80%, then your clip would start at 50% and gradualy increase to 80% (at the newly created key-frame) and, after that frame has been passed, the speed will ramp back down towards, and finally arriving at 50%, by the very end of your clip.
You do not have to delete an existing key-frame in order to change the values at that “spot”, just click the “goto next KF” button and change the value while you are parked exactly at tha frame. Changing values of unmarked frames has no effect and failing to create BOTH a start and end location and values will result in the the effect ramping from your desired value toward the default values for the given effect.
This is a VERY powerful and important concept in ALL editing programs and it applies to almost ALL effects (key-framable FX), so GROK THIS CONCEPT and play around until you master all aspects. You will use this technique on almost every project because it gives you frame-precise control over things like custom fades and you will be thrilled with the amazing creative control it will give you over complex visual effects and layered effects … EX: You can combine a color tint FX with a pond-ripple distortion FX and slowly change the shape and colors at many points on a clip.
Key framing also applies to audio controls and FX and is used in Vegas, Avid, Media Studio Pro, Adobe, FCP, Pro-Tools and many other Audio and Video studio Apps.
I have taken the time to pen this explicit (and verbose) tutorial because it is worth it to me, if one creative “cow” (or more) can have their imagination unleashed by mastery of the ubiquitous and empowering key-frame concept !
=cheers-
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Also: For cleaner (and smoother) “slow-mo” footage you should shoot your footage in 60i (60 frames interlaced USA) at either 1080 0r 720 lines rez.
It is important to “de-interlace” on output, for visual clarity.
You will make a 30P out of the 60i and try “blend fields” “bottom first” to start out … Try “interpolate” “bottom first” next.Set your quality project settings to “best quality” (not “good”) and try higher bit-rates and VBR (variable bit rate) where it applies. You can get twice the quality if you work it all out.
… and a really big output file, too! (wink).
You may have to click on “ADVANCED” settings button to get at all the settings.
=phrankus=
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