https://bugs.documentfoundation.org/show_bug.cgi?id=151514
Bug ID: 151514
Summary: Sounds attached to Impress slides are shortened during
presentation if MP3 audio quality is low
Product: LibreOffice
Version: 7.3.6.2 release
Hardware: x86 (IA32)
OS: Windows (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Impress
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: davidjudysm...@gmail.com
Description:
I often attach an MP3 audio file of a bird singing to a photo of the bird in an
Impress slide. But I have noticed that sometimes the audio file is shortened
(i.e., does not play completely) during the presentation. This problem seems
to relate to the audio quality (bit rate in kbps) of the MP3 file.
(Audio quality: I edit my audio files in Audacity and then export them to MP3.
Audacity offers options for audio quality of the variable bit rate files,
expressed as ranges of kilobits per second. The lowest quality, 45-85 kbps,
generates the smallest files. Although those files play to full length in a
Windows audio player, they are shortened to a little more than half of their
actual length during an Impress presentation.)
I will provide an example presentation that illustrates the problem, along with
three audio files.
(I have duplicated the behavior on two different Windows computers.)
Steps to Reproduce:
1. In a new Impress presentation, add a slide and insert an image. (Probably
not necessary to show bug, but it's what I do.)
2. Add a text box to the slide. Add a Custom Animation effect to the text box.
Choose animation effect, start, duration, and delay, as desired. On Effect
Options, choose a sound file with high, medium, or low audio quality. (See
attachments for the files I tested.)
3. Start the presentation. Note the length of the sound when it plays.
4. If desired, add other slides with different quality sound files.
Actual Results:
Sound files with "best quality" (e.g., 220-260 kbps as stored from Audacity)
play completely in an Impress presentation. Sound files with low quality
(e.g., 45-85 kbps) are significantly shortened: 8.3 seconds rather than the
full 12 seconds in my test.
Expected Results:
Impress should play sound files in full (as Windows Media Player does),
regardless of the audio quality.
Reproducible: Always
User Profile Reset: No
Additional Info:
Version: 7.3.6.2 (x64) / LibreOffice Community
Build ID: c28ca90fd6e1a19e189fc16c05f8f8924961e12e
CPU threads: 4; OS: Windows 10.0 Build 19043; UI render: Skia/Raster; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: threaded
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