0003008: Speed effect is handled differently in kdenlive timeline than in mlt / kdenlive and mlt speed effect out of sync

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Project

Category

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Date Submitted

Last Update

0003008

Kdenlive

Effects

public

2013-03-08 15:14

2013-03-08 15:22

Reporter

diveo

Assigned To

Priority

normal

Severity

major

Reproducibility

always

Status

new

Resolution

open

Platform

64 bit

Kubuntu

OS Version

12.10

Product Version

Recent git

Target Version

Fixed in Version

Summary

0003008: Speed effect is handled differently in kdenlive timeline than in mlt / kdenlive and mlt speed effect out of sync

Description

kdenlive 0.9.5+git20130306.4af66752-0ubuntu0~sunab~quantal1
mlt 0.8.8+git20130308.b0f31e76-0ubuntu0~sunab~quantal1
frei0r 1.3.0+git20130119.c3fdd674-0ubuntu0~sunab~quantal1

Steps To Reproduce

1. Put a (region of a) clip on the timeline and apply the speed effect to it, say 600%.
2. Watch the differences that happen when you either check the effect by advancing frame by frame in the timeline or when playing the whole timeline an stopping somewhere in between the clip with the speed effect. The project monitor won't show the proper frame.

3. Render the region with the speed effect to a final clip.

4. Add this final clip to the timeline with the existing original clip and align them.

5. You should now notice that:
5a. the rendered clip does not match the number of frames of the original clip region, for instance, it is one frame longer.
5b. the frames of the regions for the original clip with the speed effect applied and the frames of the rendered clip do not match. There is a big skew, such as almost 20 frames in my case!

Additional Information

I've attached screen shots to better illustrate the situation. The screenshots show the situation with the original clip with speed effect and the final clip positioned on two tracks of the timeline. Opacity is set of 50%.

One screenshot shows this to the extreme: in the rendered clip the right arm of the diver instructor is fully extended, while in the original clip his arm is still before his chest.

The second screenshot shows the superfluous rendered frame in the timeline and also shows that only at the end of the original clip region the instructor diver's arm is fully extended. So there is a skew of approx 20 frames.

To the viewer of the final clip it appears that there is a 20 frame still at the end of this take.

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Build/Install Method

(select)

Attached Files

kdenlive-speed-effect-difference-end.jpg [^] (289,228 bytes) 2013-03-08 15:14

kdenlive-speed-effect-difference-rendered-end.jpg [^] (268,795 bytes) 2013-03-08 15:15

kdenlive-speed-effect-difference-start.jpg [^] (289,354 bytes) 2013-03-08 15:16

Relationships

Notes
(0009371) diveo (reporter) 2013-03-08 15:22	Track 2 ("Video 2") contains the rendered clip (mp4/H.264) of exactly the region from the track below. Track 3 ("Video 3") contains the source clip material (H.264) with speed effect applied.

Issue History
Date Modified	Username	Field	Change
2013-03-08 15:14	diveo	New Issue
2013-03-08 15:14	diveo	File Added: kdenlive-speed-effect-difference-end.jpg
2013-03-08 15:15	diveo	File Added: kdenlive-speed-effect-difference-rendered-end.jpg
2013-03-08 15:16	diveo	File Added: kdenlive-speed-effect-difference-start.jpg
2013-03-08 15:22	diveo	Note Added: 0009371