SUMMARY I created a song in Ardour and used ffmpeg to add a black background so it could overlay the spectrum. I did this in two different ways, neither worked: ``` ffmpeg -loop 1 -i black.png -i SpaceMainTheme_r1_session.flac -c:v libx264 -tune stillimage -shortest SpaceMainTheme_r1_session.mp4 ``` and ``` ffmpeg -f lavfi -i color=c=black:s=1920x1080:r=5 -i Games/Ardour/SpaceMainTheme/export/SpaceMainTheme_r1_session.flac -crf 0 -c:a copy -shortest Games/Ardour/SpaceMainTheme_r1_session.mkv ``` When adding in the effect, it would play just fine in the clip monitor, but when put into the timeline, the effect would disappear and an error would pop up saying "Audio Spectrum Filter \n [filter audiospectrum] Audio not preprocessed". I also tried to use group the audio with the image in kdenlive and to transcode the audio to a wav file, neither of which worked. STEPS TO REPRODUCE 1. Export music/sound from Ardour 2. Add video (doesn't have to be pure black, I also tried with a blender animation) to music/sound by any method 3. Add Audio Spectrum Filter to the clip and place in timeline. OBSERVED RESULT Audio Spectrum does not appear. "Audio Spectrum Filter \n [filter audiospectrum] Audio not preprocessed" error pops up. Effect is deleted unless added in while in the timeline (but it still doesn't work). EXPECTED RESULT Audio Spectrum should be added to clip as previewed in the clip monitor SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux (5.4.74-1-lts) / Not using KDE Plasma (available in About System) KDE Plasma Version: N/A KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION The audio spectrum worked just fine for audio from an obs recording.
The effect "audio spectrum Filter" works as master effect only. Click top left on the timeline on "Master". The master effect window gets opened. Drag/drop the effect into that window. Now it should work.
(In reply to emohr from comment #1) > The effect "audio spectrum Filter" works as master effect only. Click top > left on the timeline on "Master". The master effect window gets opened. > Drag/drop the effect into that window. Now it should work. That worked. However, I don't think it is that simple, since putting the effect on my obs mkv clip did work in the project. Also, if this is the intended usage of the effect, I could not find anything in the documentation to indicate that the effect only works on the master bus.
Since version 19.04 with splitting video/audio on separate tracks following 4 effects doesn’t work anymore: - Audio Spectrum Filer - Audio Wave - Dance - Light Show With introducing of the master effect in version 19.12 you could add these 4 effects as master effect. Disadvantage: The effect works global. Where that info could be added in the user manual for easy finding?
I would say under each of the affected effects. When I had trouble with the spectrum effect, I looked on that page and found no mention of this. The page in question for this specific example is https://userbase.kde.org/Kdenlive/Manual/Effects/AnalysisandData/Audio_Spectrum_Filter
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Created attachment 133783 [details] Master effects In the upcoming version 20.12 it has a separate folder for these master effects. And yes, the handbook has to be updated.
This seems to be solved so I am closing this. Feel free to reopen this bug or create a new report if this is still happening with the latest version (https://kdenlive.org/en/download/)