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IDProjectCategoryView StatusDate SubmittedLast Update
0000395KdenliveEffectspublic2008-11-23 13:322009-07-23 14:11
Assigned To 
PrioritynormalSeverityfeatureReproducibilityhave not tried
PlatformOSOS Version
Product Version0.7.0 
Target VersionFixed in Version 
Summary0000395: Realtime Time-Stretching for Video/Audio
DescriptionIt would be nice to have realtime time-stretching for video/audio with markers for binding some points of clip to timeline-positions.


- live-video with bad audio - replace audio with studio records, without making cuts

- music videos

any other?
TagsNo tags attached.
Build/Install MethodDistribution package
Attached Files

- Relationships
related to 0001026new Dynamic, keyframable clip speed 

-  Notes
cinephiliac (updater)
2008-11-23 18:28

Can you clarify what you mean by "realtime time stretching" and "points of clips to timeline positions" in a bit more detail?
How does "realtime stretching" differ from the current clip speed settings?
Do you mean being able to keyframe clip speed?
cyberbeat (reporter)
2008-11-23 18:40

I think I mean to keyframe clip speed. But with more intuitive GUI:

Set multiple markers on a clip (audio or video), and drag a marker to left/right while leaving the markers stay on their position, which has the effect of time-shifting.


Original Track with markers M1, M2, M3:

Time-Stretching by dragging Marker M2:

By the way: Is it possible to zoom in vertically? This would be also nice to do exact work with audio-clips.
LeHomard (developer)
2009-02-05 15:15

Vegas can Keyframe the speed of clips, using a timeline and keyframes that can be dragged up or down (and not left or right, which wouldn't be visually usable).
It's a very powerful feature, and it really makes a difference compared to Premiere Pro for instance.
Granjow (developer)
2009-06-23 23:46

This feature would be so nice.

I just stumbled over a few videos. [^] See 2:10. The speed fist move has been increased, about twice as fast now. If you don't know the game, you don't even remark it as it is so smooth. [^] The content is sort of special, but the effects ...

He has done it with Sony Vegas 8.

Actually I don't know any other video editing program except Pinnacle (used years ago for some very very basic things). Therefore I also haven't ever seen how they do such an effect. What I imagine is something 2-dimensional ... I'll add a picture.

This feature would be _really_ cool! (Said it again, yes, but it is true.)
Granjow (developer)
2009-07-02 13:35


I think Bézier curves would be the wrong way because it isn't granted that it doesn't go backwards. Perhaps the method used in Gimp for color correction is better: Either straight lines or polygone interpolation.

Perhaps this could be mixed by using two sorts of nodes: Inserting a «linear node» draws a straight line from the previous node to the inserted one, and inserting an «interpolation node» would interpolate a polynom over all connected previous interpolation nodes. See attachment.
cyberbeat (reporter)
2009-07-02 14:08

my original idea was more in direction of syncing manually video/audio. so a horizontally drag of keypoints (in combination with the possibility to zoom) would make sense.
Granjow (developer)
2009-07-02 16:47

Ah, I understand.

I think I should open an own bug report.
Granjow (developer)
2009-07-07 13:41

Created a new bug report: 0001026
Will delete my attached files, as they don't suit here.

- Issue History
Date Modified Username Field Change
2008-11-23 13:32 cyberbeat New Issue
2008-11-23 13:32 cyberbeat Build/Install Method => Distribution package
2008-11-23 18:28 cinephiliac Note Added: 0001360
2008-11-23 18:28 cinephiliac Status new => feedback
2008-11-23 18:28 cinephiliac Category Transitions => Effects
2008-11-23 18:40 cyberbeat Note Added: 0001361
2009-02-05 15:15 LeHomard Note Added: 0002359
2009-06-23 23:46 Granjow Note Added: 0003415
2009-06-23 23:46 Granjow Status feedback => acknowledged
2009-06-24 00:05 Granjow File Added: kdenlive-dynamic-clip-speed.png
2009-07-02 13:35 Granjow Note Added: 0003577
2009-07-02 13:35 Granjow File Added: kdenlive-dynamic-clip-speed-curve.png
2009-07-02 14:08 cyberbeat Note Added: 0003578
2009-07-02 16:47 Granjow Note Added: 0003579
2009-07-07 13:41 Granjow Relationship added related to 0001026
2009-07-07 13:41 Granjow Note Added: 0003614
2009-07-07 13:41 Granjow File Deleted: kdenlive-dynamic-clip-speed.png
2009-07-07 13:42 Granjow File Deleted: kdenlive-dynamic-clip-speed-curve.png

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