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Why can't I use speed changes on a reversed clip?
Ben-Robert [Avatar]
Newbie Joined: Dec 15, 2014 01:21 Messages: 17 Offline
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If I reverse a clip and then try to add a speed change, it won't let me before undoing the reversal. Why?
optodata
Senior Contributor Location: California, USA Joined: Sep 16, 2011 16:04 Messages: 8630 Offline
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The message you see is only referring to the preview you'll see in the Video Speed tool:



If you click Yes, the Video Speed tool opens and you can set the speed for the entire clip or a selected range. The only difference is that the video will be previewed in the normal direction as the tool isn't able to apply the reverse effect. Many tools are like this and you'll get a similar warning message when incompatible timeline edits/effects are applied.

Once you've set the speed, the clip will show at the new speed and be reversed like you expect when previewing and producing.
Ben-Robert [Avatar]
Newbie Joined: Dec 15, 2014 01:21 Messages: 17 Offline
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On that last point, that doesn't seem to be the case.

I am applying different speeds to the same clip. I speed up, slow down and speed up again, creating a speed ramp effect. When I then preview it, it isn't reversed anymore because that was removed.

If I reverse it afterwards *(why is that even possible btw if it can't speed up reversed clips? so silly.)* then it doesn't apply the speed changes to the same places that I did. My impression is that it doesn't reverse the speed changes together with the clip, though my observation might be wrong.
PowerDirector Moderator [Avatar]
Senior Contributor Location: New Taipei City, Taiwan Joined: Oct 18, 2016 00:25 Messages: 2104 Offline
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Quote On that last point, that doesn't seem to be the case.

I am applying different speeds to the same clip. I speed up, slow down and speed up again, creating a speed ramp effect. When I then preview it, it isn't reversed anymore because that was removed.

If I reverse it afterwards *(why is that even possible btw if it can't speed up reversed clips? so silly.)* then it doesn't apply the speed changes to the same places that I did. My impression is that it doesn't reverse the speed changes together with the clip, though my observation might be wrong.


Hi,
My observation is that speed changes are purely timeline based and not tied to "content", as it were. So if a clip is speed ramped and then reversed, the speed changes retain their timeline values independently of what happens to the clip "contents".

Perhaps it is best to view speed changes like titles etc. that retain their timeline position, irrespective of what happens to the clip they are "attached" to.


Given these constraints, the solution would be to reverse the clip, produce, bring back and then apply speed ramping as required.

Cheers
PowerDirector Moderator

This message was edited 1 time. Last update was at Sep 02. 2021 04:47


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Ben-Robert [Avatar]
Newbie Joined: Dec 15, 2014 01:21 Messages: 17 Offline
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Quote

Given these constraints, the solution would be to reverse the clip, produce, bring back and then apply speed ramping as required.

Cheers
PowerDirector Moderator


That would result in a pretty massive degradation in quality but yeah, more workarounds. I wish I had a mac Final cut and logic pro are something I miss.
JL_JL [Avatar]
Senior Contributor Location: Arizona, USA Joined: Oct 01, 2006 20:01 Messages: 6091 Offline
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Another option perhaps, since the speed module does not linear tapper speeds and just applies speeds to a marked area, would be to simply split the video at desired speed change points. Apply speed change and then video in reverse change to each chunk, rearrange on timeline and you have it with no pre producing if that's the sore spot.

Jeff
optodata
Senior Contributor Location: California, USA Joined: Sep 16, 2011 16:04 Messages: 8630 Offline
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Quote That would result in a pretty massive degradation in quality...

That's not true. If you produce to the same output profile as your final project there will be minimal changes in a second run-through, especially if SVRT is available.
Ben-Robert [Avatar]
Newbie Joined: Dec 15, 2014 01:21 Messages: 17 Offline
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Quote

That's not true. If you produce to the same output profile as your final project there will be minimal changes in a second run-through, especially if SVRT is available.


That implies I won't be editing it further after I export. The only way that would be true is if I do all color editing etc before exporting, but that is a pretty backwards workflow, considering the way you would normally edit a series of clips is cut them together and then color grade etc afterwards. Color grading a compressed clip VS a raw clip absolutely yields different results.

I really wish PD was more versatile and allowed me to just do what I need to do. The layout of features and general flow is quite nice, but the software is really suffering from lack of budget. I wish there was a true "pro" edition that cost $200 which would fix this stuff.
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