I have also an audio-gaps-problem, but the sound is already in Kdenlive (0.9.2) gappy, before rendering.

The videos have several sources (48kHz und 44,1kHz) and the project profile is HD 720 25fps. I also tried extracting audio (48kHz) and re-import but its still not working. Video looks fine, btw.

I got a (realy strange) solution: I just deleted a unused audio-track. Why that works? I don't know, especially because there is still one unused video- and one unused audio-track in the project. Now, there are no more sound problems, neither at work nor after rendering.

Hope that helps someone. ;)

I am also having the audio gaps problem, but deleting the remaining (empty) audio tracks did not help me. I render 1080 24P to DVD using the default ntsc 16:9 vob profile.

So what versions are you guys using?

0.9.2 is now not supported
0.9.4 was the previous supported version but we are now transitioning to 0.9.6 (which I am waiting to see when sunabs ppa makes available)

You should try upgrading to 0.9.4 or 0.9.6 to see if this fixes the issue. Many bug fixes have been put into these versions.

This was working fine for years, and then some recent update has broken this.. I dunno what has changed...

ffmpeg version 0.10.6-6:0.10.6-0ubuntu0jon1~precise1
0.9.4 kdenlive
0.8.8 melt.

I downloaded a daily build and the problem persists. kdenlive-ubuntu12.04-x86_64-20130409 I get audio gaps (sounds like stuttering) in rendered video. How come the daily build is 0.9.5 but 0.9.6 is released?

I looked into the build script, but got problems with dependencies...Over my head.

Hoping the PPA for 0.9.6 is up soon....

Using the latest 0.9.6 from sunab release and I still get audio gaps when rendering? Has 0.9.6 fixed this issue for anyone else?

Is your 44,1kHz source on a seperate track? If so if you place it on the same audio track with the 48 kHz do you still get the gaps? Alternatively try using Audacity to resample 44 to 48 and remove 44 from project?

It appears to be a bug, is the 44,1kHz source a wav or mp3?

After a couple of more tests...

I managed to prevent the issue by telling kdenlive in the render wizard NOT TO resize the video size. Indeed, I asked it to resize the video to a 720p format (instead of 1080p) for size reasons. My source videos are 720p at 23.98FPS (it's written : 23.976024 in VLC) (Canon camera).

Without resizing : audio is OK (although, now that I upgraded to 0.9.6, for some reason, I only hear one audio track at a time but that's a different problem).

When resizing : audio has tons of gaps.

And : GOOD news, I managed to reproduce the bug too in the new project I created, by telling kdenlive to produce a resized video as well. So it seems to be the culprit !!


BTW : someone else in the thread suggested to remove ununsed track, I did it and it made no difference here.

Cheers !

PS : please ask me, I can upload some project files so that kdenlive devs can try this at home. My setup is Kubuntu 12.10 amd64 + the kdenlive PPA.

Still occurs with 0.9.6 here.

As far as I'm concerned, everything is OK in the preview but I get gaps in the rendered file.

I tried rendering to both 44.1 and 48 KHz and tried tons of codecs combinations and it made no difference. I even rendered the whole soundtrack to a separate 48 KHz MP3 and then added it back in my project and it still produced the gaps.

I eventually worked around the problem by rendering the soundtrack seperately (in kdenlive) and adding it to my video file in avidemux : it worked.

(one note : in my project, I added some camera files which countain 48 KHz audio, which is disabled and recorded some sound from a microphone from within kdenlive and I also play some regular mp3 / ogg files)

Edit : OOPS, there's a big new problem in 0.9.6. My audio tracks are not mixed anymore in my existing project : only one is played at a time now :-( From both the preview and the rendered file. It worked in 0.9.4. It seems OK from a blank project. I'm trying to figure out when it's triggered...
Edit 3 : apparently, muting then un-muting my third audio track (then saving the project) fixes the "only one audio track can be heard at a time" issue ; even if the third track was overlapped by the 1st or the 2nd.

Edit 2 : obvisouly, when I try to create a new project with the same files I used in the first one (well, only a part of them), it doesn't trigger the issue :)

OK : I'm uploading some test video & sound files I just made for the occasion, here :

http://mahen.free.fr/kdenlive_test_case cat.MOV and sifflement.wav

(they'll be up in about 10 minutes)

To reproduce the problem (kdenlive 0.9.4/0.9.6 Kubuntu 12.10) :

- create a blank project (1080p, 24.98 FPS)
- insert the video
- insert the sound file
- render in any format. For instance mpeg4 with mp3 sound.
- make sure you asked kdenlive to resize the video size to 1280x720

You should get many gaps in the resulting video file.

I can file a bug report with all those if relevant. Please tell me :-)

Cheers !

@bidinou Looks like you found a defect. Submit a defect report at http://www.kdenlive.org/mantis and attach files there. Otherwise this will not get seen to.

OK then : I made a bug-report there ! Hope it helps ! :-)

Oh I forgot say : the bug was fixed in libmlt (not yet in the ppa but hopefully soon in a next version) ! Thanks to the development team ! :-)