Created attachment 126158 [details]
WAV flle triggering the issue.

SUMMARY

After recording a WAV file from my phone (LineageOS Android / "Soundrecorder") I and inserting it into the Kdenlive timeline, I noticed the file would only be played when the "time" cursor is first set before the beginning of the audio file in the timeline.

If I seek / start playing the video preview after the beginning of the aforementioned WAV file, I hear no audio. If I cut the audio file (inside of kdenlive) into several pieces, each piece is played at a bad offset relatively to the full WAV file.

After double checking with other WAV files, I figured out it would only happen with WAV files produced by the Android Soundrecorder. They don't seem to be corrupt though, I can open them in Audacity etc.

STEPS TO REPRODUCE
1. Record a WAV file from the Android Soundrecorder
2. Import it into any Kdenlive project
3. Insert it into the project timeline
4. Move the cursor between the beginning and the end of the WAV file
5. Play the preview

OBSERVED RESULT

Audio is not played (at least, the relevant audio track).

EXPECTED RESULT

WAV file should be heard.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: KDE Neon, up to date, Plasma 5.18.1, KDE Apps 19.12.2
(available in About System)
KDE Plasma Version: 5.18.1
KDE Frameworks Version: 5.67.0
Qt Version: 5.13.2

ADDITIONAL INFORMATION
Audio editing / previewing / cutting work perfectly when using WAV files from other sources (though I only tried a couple of them -- incl. with the same bitrate / frequency) and with MP3 files. Audio is played when the cursor is set before the inserted audio sample.