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IDProjectCategoryView StatusDate SubmittedLast Update
0003203KdenliveRenderingpublic2013-12-26 09:222014-02-09 17:49
Assigned To 
PlatformOSOS Version
Product Version0.9.6 
Target VersionFixed in Version 
Summary0003203: Audio crackle between clips without transition
DescriptionThe H.264 video rendered has an audio crackle each time a clip ends and the next clip starts, if no transition is used. The clips are "snapped" to each other on the timeline.

I found a workaround: Adding a very short (00:00:00,01) fade in/fade out to each clip eliminates the crackle, but it's a lot of work which should not be necessary.

Attached you will find two short MP4 files: one containing the crackle (without fade in/fade out) and one without the crackle (with fade in/fade out). A screenshot will show the position, effects and timeline of the videos rendered. For further inspection I'll attach the project file as well.
Additional InformationThe number of encorder threads has no impact on the audio crackle.

axel@miraculix:~/Videos/ölüdeniz_2013$ dpkg --list kdenlive
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
ii kdenlive 0.9.6-2ubuntu1 amd64 non-linear video editor
TagsNo tags attached.
Build/Install MethodDistribution package
Attached Filespng file icon KdenliveCrackle.png [^] (99,103 bytes) 2013-12-26 09:22

? file icon no_fade.mp4 [^] (2,792,833 bytes) 2013-12-26 09:24
? file icon fade.mp4 [^] (2,792,773 bytes) 2013-12-26 09:25
? file icon ölüdeniz_2013.kdenlive [^] (142,719 bytes) 2013-12-26 09:25

- Relationships

-  Notes
vpinon (administrator)
2013-12-29 22:50

which mlt version do you use?
does the bug depend on the source format or is it the same with any (eg mkv)?
thanks for feedback
camueller (reporter)
2013-12-30 17:52


As source I have only the MP4 file created by my GoPro 3 black action cam.
No idea if other source formats cause crackle as well.
Over that past 3 years I've created about 10 videos using KDEnlive (in case you want to check them out: [^] ) for which I did not have to add fading to avoid crackle. Maybe it is related to the fact that I have upgraded to Ubuntu 13.10 recently. So far I've been using Ubuntu 12.04.
vpinon (administrator)
2014-01-07 07:31

could you attach a short *source* video sample?

you could also try to convert your source video format with ffmpeg/avconv before importing it, eg:
avconv -i original.mp4 -acodec copy -vcodec copy new.mkv
for format convertion without transcoding, or
avconv -i original.mp4 -ab 128k -qscale 5 new.mkv
for transcoding
camueller (reporter)
2014-02-09 17:49

I could upload the MP4 source files I used to create no_fade.mp4 and fade.mp4.
These are the ones displayed in the screenshot. You could use the kdenlive project file I already attached. Source files are about 30 MB each:

-rw-r--r-- 1 axel axel 33741194 Jan 20 2012 GOPR0069.MP4
-rw-r--r-- 1 axel axel 29967136 Jan 20 2012 GOPR0070.MP4

I would upload them to a public file hoster - do you have any preference?

Regarding you recommendation to convert the source video before import: Do you really suggest working with kdenlive that way? In this case the workaround I already describe is much more convenient in my opinion.

- Issue History
Date Modified Username Field Change
2013-12-26 09:22 camueller New Issue
2013-12-26 09:22 camueller File Added: KdenliveCrackle.png
2013-12-26 09:24 camueller File Added: no_fade.mp4
2013-12-26 09:25 camueller File Added: fade.mp4
2013-12-26 09:25 camueller File Added: ölüdeniz_2013.kdenlive
2013-12-29 22:50 vpinon Note Added: 0009643
2013-12-30 17:52 camueller Note Added: 0009645
2014-01-07 07:31 vpinon Note Added: 0009653
2014-02-09 17:49 camueller Note Added: 0009681

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