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IDProjectCategoryView StatusDate SubmittedLast Update
0000396KdenliveMLTpublic2008-11-23 13:352008-12-21 13:24
Reportercyberbeat 
Assigned To 
PrioritylowSeverityfeatureReproducibilityalways
StatusacknowledgedResolutionopen 
PlatformOSOS Version
Product Version0.7.0 
Target VersionFixed in Version 
Summary0000396: Audio-Stream of video does not play back, if video-speed is changed. This also applies to audio-tracks.
DescriptionIf I change the speed of a clip in track (right click - change speed), the audio is not played back anymore.
TagsNo tags attached.
Build/Install MethodDistribution package
Attached Files

- Relationships

-  Notes
(0001359)
cinephiliac (updater)
2008-11-23 18:19

Acknowledged on:
ffmpeg: Revision: 15905 Last Changed Date: 2008-11-21 19:29:49 -0500 (Fri, 21 Nov 2008)
mlt: Revision: 1240 Last Changed Date: 2008-11-17 00:57:32 -0500 (Mon, 17 Nov 2008)
mlt++: Revision: 1240 Last Changed Date: 2008-11-06 00:32:23 -0500 (Thu, 06 Nov 2008)
kdenlive: Revision: 2718 Last Changed Date: 2008-11-19 18:13:27 -0500 (Wed, 19 Nov 2008)

Returning speed to 100% reverses the problem.
Increasing to 105% or slowing to 50% brings it back.
(0001740)
ddennedy (developer)
2008-12-17 07:37

This is a known side-effect as indicated by the dropping of the audio waveform. Right now, this feature is not a comprehensive time manipulation; many features have their limitations. Therefore, this issue can be considered a feature request.

In that case, what do you expect to happen to the audio? Do you want to use some fancy audio dsp to adjust the duration without affecting the pitch?

http://www.surina.net/soundtouch/ [^]
(0001746)
cyberbeat (reporter)
2008-12-17 08:58

Yes, a realtime dsp for adjusting duration would be good. Perhaps let choose
a) if effect should be a fast realtime, or should be applied (modifiying the data)
b) the algorithm (speed/quality)
c) perhaps different for preview/rendering (rendering always good)

I made another feature request about setting markers for realtime duration-correction inside of tracks, I think same realtime-algorithms could be used.
(0001764)
ddennedy (developer)
2008-12-17 19:12

Jeesh, don't forget motion-estimated interpolation on the video as well!

Someone please change this to a feature request, but do not target any specific near term release.
(0001863)
madsdyd (administrator)
2008-12-21 13:24

Changed to long-term feature request.

- Issue History
Date Modified Username Field Change
2008-11-23 13:35 cyberbeat New Issue
2008-11-23 13:35 cyberbeat Build/Install Method => Distribution package
2008-11-23 18:19 cinephiliac Note Added: 0001359
2008-11-23 18:19 cinephiliac Status new => acknowledged
2008-11-23 18:19 cinephiliac Category Transitions => MLT
2008-12-17 07:37 ddennedy Note Added: 0001740
2008-12-17 08:58 cyberbeat Note Added: 0001746
2008-12-17 19:12 ddennedy Note Added: 0001764
2008-12-21 13:24 madsdyd Note Added: 0001863
2008-12-21 13:24 madsdyd Priority normal => low
2008-12-21 13:24 madsdyd Severity minor => feature
2008-12-21 13:24 madsdyd Projection none => major rework
2008-12-21 13:24 madsdyd ETA none => > 1 month


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