Audio noise issue with 48000Hz 32-bit MP4 files in Premiere Pro (ver. 24.6.5 and others)

Description:

I'm encountering an audio issue in Adobe Premiere Pro when importing MP4 files with 48000Hz, 32-bit audio. A "pop" or "boom"-like noise overlays the dialogue, even though the original file has no such noise. This issue persists across versions and remains in the exported video.

Issue Details:

• The issue occurs when importing MP4 files with 48000Hz, 32-bit audio.

• During playback in the timeline, and after export, an unwanted "pop" or "boom" noise appears over speech.

• The noise is not present in the original file when played in external media players.

• Converting the same audio to WAV and importing it into Premiere Pro eliminates the issue.

Environment and Reproduction Steps:

1. OS: Windows 11 (version 24H2)

2. Premiere Pro versions tested: 24.0, 24.6.4, 24.6.5

3. Hardware specs:

   • CPU: 13th Gen Intel(R) Core(TM) i7-13700H @ 2.40 GHz

   • RAM: 32GB

   • GPU: NVIDIA GeForce RTX 4060 Laptop GPU

4. Steps to reproduce:

   • Import an MP4 file with audio in 48000Hz, 32-bit

   • Play back the timeline: noise overlays the dialogue

   • Export the video: the noise remains in the final file

What I've Tried (but did not solve the issue):

• Clearing media cache

• Restarting the PC

• Reinstalling Premiere Pro

• Testing across multiple versions (24.0, 24.6.4, 24.6.5)

Expected Result:
Clean playback and export of the original audio without distortion or noise.

Actual Result:
Unwanted audio noise appears over dialogue in both playback and exported video.