https://bugs.kde.org/show_bug.cgi?id=527492

            Bug ID: 527492
           Summary: Random audio popping (clicks) when rendering AAC
                    inside MKVs
    Classification: Applications
           Product: kdenlive
      Version First 26.08.2
       Reported In:
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Rendering & Export
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

DESCRIPTION

I have a small project with multiple video and audio clips. The files are MKVs
with AAC audios muxed into them.
When rendering the project to litteraly anything (from audio only WAV, ALAC to
H264/AAC or FFV1/FLAC...), there are random clicks/popping on the audio.

If I convert the audio to flac or WAV and import them separately OR remux them
into the MKVs, there's no issues

STEPS TO REPRODUCE
1. Make a project with multiple MKVs with video + AAC audio (its better if its
voice recordings, you'll find the clicks faster)
2. Create several clips in the timeline, export it the whatever
3. Export it the any format

OBSERVED RESULT

Audio popping, that you can see in the audio spectogram as well

EXPECTED RESULT

No clicks/popping.

SOFTWARE/OS VERSIONS 26.08.2
Operating System Windows 10

ADDITIONAL INFORMATION

When importing a raw AAC, for example if I demux it from one MKV, kdenlive asks
me to transcode it because the current file is not seekable. Maybe that's what
happend when importing the MKV, but kdenlive doesn't warn us about that. I
imagine that afterward, when rendering; kdenlive/mlt have an issue
reconstructing/decoding the audio, which creates clicks when joining AAC
samples?

Anyway, I think that the user should not have to think about this preferably, I
don't think other editing softwares would have the same issue? I hope that's
it's possible.

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