[k3b] [Bug 418079] New: k3b problems with flac 24bit

[Nikos Papadopoulos]

https://bugs.kde.org/show_bug.cgi?id=418079

            Bug ID: 418079
           Summary: k3b problems with flac 24bit
           Product: k3b
           Version: 19.04
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Audio Project
          Assignee: k3b at kde.org
          Reporter: 231036448 at freemail.gr
                CC: michalm at jabster.pl, trueg at kde.org
  Target Milestone: ---

SUMMARY
K3b has problems creating audio CDs out of 24bit flac files, but reports
success.

STEPS TO REPRODUCE

Version 1
1. download some 24bit flac files
2. open k3b, create a new audio CD project
3. add the 24bit flac files
4. choose to "extract audio only" (you can also choose to burn the CD, but
you'll just waist a CD)
5. check (open) the new wav files with audacity, or mediainfo, or any media
player


Version 2
1. open an audio file with audacity
2. crop the bulk of the file and keep just 1.5 seconds of sound
3. export as 24bit flac file (example: "001_24bit_8compresion.flac")
4. again, export, but this time, as a 16bit flac file (example:
"002_16bit_8compresion.flac")
5. check the two new flac files with some other media app (the audio must be
practically the same)
6. ...
7. open k3b, create a new audio CD project
8. add the 24bit flac file AND the similar 16bit flac file
9. choose to "extract audio only" (you can also choose to burn the CD, but
you'll just waist a CD)
10. check (open) the new wav files with audacity, or mediainfo, or any media
player


OBSERVED RESULT

In version 1, the files that were produced were empty of audio.
Although they were proper files 
(mediainfo showed them as typical wav files,
but opening them with audacity showed a flat line,
and other media players played the files "normally", 
but with 0 sound).
Previously I had burned the CD, and k3b reported as 100% done.
Yet, when I tried to play the CD, it was playing "normally", 
but with no sound coming out.

In version 2, the wav file, that was produced by the 24bit flac file, had
sound, but had gotten cropped by k3b.
Instead of 1.5 seconds of music it had only 1.0 seconds.
quote from the original 24bit flac:
> Complete name                            : .../001_24bit_8compresion.flac
> Duration                                 : 1 s 562 ms
quote from the created wav file:
> Complete name                            : .../k3b_audio_0_01.wav
> Duration                                 : 1 s 0 ms
Whereas the similar wav file, that was produced by the similar 16bit flac file,
had no problems.

Therefore I concluded that k3b has problems with 24bit flac files.

EXPECTED RESULT
This is probably an issue with the flac encoder, but k3b should, at least, warn
the user in advance, instead of falsely reporting success, afterwards.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma:   Mageia 7 64bit
KDE Plasma Version: 
KDE Frameworks Version:    KDE Frameworks 5.57.0
Qt Version:   Qt 5.12.6 (built against 5.12.2)

ADDITIONAL INFORMATION

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