| Summary: | Waveform audio visualization doesn't display correctly for some clips | ||
|---|---|---|---|
| Product: | [Applications] kdenlive | Reporter: | Mazin07 <mazin07+kde> |
| Component: | Timeline & Editing | Assignee: | Jean-Baptiste Mardelle <jb> |
| Status: | CONFIRMED --- | ||
| Severity: | normal | CC: | erjiang, fritzibaby, kolloom |
| Priority: | NOR | ||
| Version First Reported In: | git-master | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: |
Demo file showing this bug
waveform misalign |
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The bug is because the audio in the demo file is not centered at zero. Looks like Kdenlive shows audio amplitude as `max(highest_value, -lowest_value)` but it would need to instead calculate the value range within each time window. Otherwise a silent audio track that's not centered at zero will look like a non-silent track. Created attachment 152175 [details]
waveform misalign
I would also add to this. I rendered out a 4 audio track video. Beside the issue of volume not displayed correctly, the waveforms are also offset and no longer aligned with master bus (track1) above kdenlive 22.04.3 on windows 10 below davinci resolve 18.0.36 |
Created attachment 147776 [details] Demo file showing this bug SUMMARY I am using SimpleScreenRecorder to record some desktop clips including captured audio from the programs. The audio plays fine in kdenlive and any other program I use, but the visualization is incorrect, making it useless for editing. File is a MKV with Vorbis audio. STEPS TO REPRODUCE 1. Download the attached video file and add to a Kdenlive project. OBSERVED RESULT Audio visualization doesn't match actual audio. EXPECTED RESULT Audio visualization matches actual audio. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Ubuntu 20.04.4 (available in About System) Kdenlive: kdenlive-master-165-linux-centos_64-gcc.AppImage Mar 24, 2022