HEVC (H.265) export results in two separate files (.mp4 video without audio and .aac audio) instead of a single multiplexed container.
Steps to reproduce:
- Export any sequence using Format: HEVC (H.265).
- Multiplexer is confirmed set to MP4, and both Export Video & Audio are checked.
- Hit Export.
Result: Muxing fails silently at the end; Premiere leaves an un-muxed .mp4 file and an .aac file in the export directory.
Expected: A single merged .mp4 file with both video and audio streams.
Note: The exact same sequence exports correctly to a single file in the release version of Premiere Pro and when exporting to H.264 in Beta. Resetting preferences and toggling VTB software fallback does not resolve the issue.
System info
Application: Premiere Pro (Beta) v27.0.0.38
OS: macOS v26.6.2, RAM: 16.00 GB GB, CPUs (logical): 10
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