I recently installed the latest kubuntu and the other day started kdenlive. it is version 19.12.3. Overall I was disappointed with at a lot of the changes that made the software unfamiliar, difficult to find features I relied on, and many introduced bugs.

My particular problem at the moment is the audio wave effect. I rendered the mp3 audio to a video with an empty (i.e. black) video. I then loaded the rendered video into the project. Eventually I figured out you have to have adjacent audio and video tracks and it gets added to both after beeping several times. I then applied the audio wave effect to the video.

I tried playing it and it seemed to work nicely, showing visualizations for both channels. I tried adding some geometric transformations, reduced the opacity and overlaid it over a picture. So far so good.

Then my computer froze. I restarted. I reloaded the project. Since then the visualization always shows a solid line. I've tried a new project and loaded it again but the audio wave effect still refuses to show any activity. I tried a different video. No luck.

I also tried the audio spectrum filter effect and it displays absolutely nothing.

Any advice on what's gone wrong and what to try?

can you re-try with Kdenlive 20.12.1c ? (just to be sure to not fill a bug report about something fixed on last year)

I'd be happy to try it but how do I upgrade to 20.12.1c?

If I go to the software app in the system menu it only lists 20.04.0.

using an appimage: https://files.kde.org/kdenlive/release/ ... 4.appimage (this just to try an updated one)

i tried the appimage (21.08.3) on two projects that didn't work. one of them rendered perfectly. the other one still has the error, in fact it's a bit worse.

Raichu wrote:i tried the appimage (21.08.3) on two projects that didn't work. one of them rendered perfectly. the other one still has the error, in fact it's a bit worse.

This indicates that there is an issue with one of the source files. kdenlive can be very picky in this regard. Try to pinpoint the offending clip and then re-encode the source using makemkv or ffmpeg.

The only clips are the original mp4 and the subtitles created in kdenlive itself.

I tried
ffmpeg -i original.mp4 reencoded.mp4
and replaced the file in the project with reencoded.mp4. no luck, it still did the same thing.

i'm clutching at straws here but is there a way to ensure that ffmpeg really fully decodes and re-encodes? note: according to the documentation you need to explicitly use the "copy" option to stop it doing this.

Not sure if this is relevant to your issue, but....

I have 2 effects by the name of Audio Spectrum Filter & Audio Wave in my Kdenlive (version 20.11.70 appimage running on Ubuntu 18.04).
Both of these are "visualizer" effects based on the audio that's playing in the clips, but they MUST be added to the MASTER effects channel in order to work.
They won't work on clips directly, and they won't work as individual Video/Audio track effects.

Hope this helps--
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