I have just started using Kdenlive. I need to edit the audio in Audacity to notch out a continuous high frequency whining noise.

I have separated the audio from the video track, but how do I export the audio into Audacity?

Depending on your source, could you extract it from your source clip with something like ffmpeg or mp4box for mpeg4 etc on the CLI and bring it in seperately?

kdenlive has a lot of audio processing tools from the underlying libraries and filters is there nothing there?

I can drag each source clip into Audacity and the audio appears there and I can edit it. Doing it that way I have to edit each clip individually before adding them in Kdenlive. What I would like to do is take the audio from the edited project containing all the clips and then edit the audio in Audacity. The source clips are from my compact camera which puts a 3.4kHz constant background tone on every video clip, therefore each clip has the same problem and it would be easier if I can just take the edited project audio and just run it through Audacity and then just import it back in?

I have had a look at the effects available in Kdenlive but didn't see a notch filter. I will have a closer look, but would like to use Audacity if I can.

Sorry about the duplicated thread, not sure exactly how that happened

I see, yes you should be able to render out the audio strips through kdenlives render dialogue by selecting the audio tracks wanted on the timeline and then choosing a suitable audio codec or uncompressed, again depending on source and rendering 'selected' tracks.

There may be a quicker way, but not at my machine to suggest where. :-)

you should be able to render out a wav file in kdenlive. Pick render then select audio only from the drop down list

edit: yellow posted before me

Also as kdenlive has access to LADSPA filters there is a notch filter here, not sure how good:

http://www.suse.de/~mana/ladspa.html and probably others.

Thanks I will have a look at that later today. I will try the ladspa notch filter first, I will have a look for it. I will also try the rendering approach.

hi, just sitting at my machine and notice that there is a 'Mags Notch Filter' listed in kdenlive's audio effects list.

This is with 8.2x from svn (sunabs PPA) and a selection, but not extensive selection of ladspa filters and a couple of audio apps that use ladspa installed from Ubuntu's repositories.

Mags Notch Filter is from the Steve Harris plugins http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html available in Ubuntu repositories.

Thanks Yellow,

I managed to use the render audio only function to export a wav file to Audacity where I can edit it. I also looked at the LADSPA audio effects within Kdenlive and tried the Mag's notch filter. However I didn't have much success with it. what I am not sure about is how the effects work once they have been added. Are they supposed to work in real time as you play the project, as in a preview mode, or only take effect when the project is rendered? Does this depend on the effect being used?

Realtime in theory, certainly many do for me.

I will try some of the other audio effects and see if I can get them to work in real time. Can you suggest an effect that you know works in real time that I can try?

I'm not at my machine but from memory, I have most / all of the ladspa plugins installed that are available through Ubuntu repositories, such as the Steve Harris ones mentioned above, TAP & CSound.

I've also got the Guitar Effects application which comes with many ladspa plugins, can't remember it's name, but in the same repositories and the jack-rack stuff.

The effects that I know worked 'realtime' for sure are the various chorus, flanger and delay effects together with the Tape machine Delay plugin.

I'm running 8.2x git version from sunabs PPA on Ubuntu 11.10 64bit on an old Sempron and external USB sound device. So old hardware.

The sources are 48mbit/s HD h264AVC video with an uncompressed PCM audio track, editing with proxies. The proxies are generated with a mjpeg video codec but copying the audio track so still uncompressed PCM. (I've found that any jumpy playback issues are with decompressing the h264AVC video stream, not the audio, hence copying / muxing the original audio stream into the proxy.

On a side note, I really need to find the 'best' plugins and install them only removing the rest because adding loads of them makes kdenlive's audio effects menu grow massively, it detects new ones as they are added to the system. My audio effects plugins menu in kdenlive currently covers my dual monitor setup when opened. :-)

I have managed to get some of the audio effects to work, thanks for your help. Learning how to use Kdenlive is going to take me some time I think. There are a lot of features to cover. At the moment I am just trying to get to grips with basic editing.

Thanks