https://bugs.kde.org/show_bug.cgi?id=428846
Bug ID: 428846
Summary: Cannot generate audio spectrum for audio created by
Ardour
Product: kdenlive
Version: 20.08.3
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: jeremy+...@techiedamien.xyz
Target Milestone: ---
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.
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