Audio keyframe bug

[the outward spiral]

I've been experiencing this bug for a long time now (at least 2 years).

When I add volume level keyframes to an audio clip, they're usually linear by default, so I'll right click on them and choose a different interpolation if needed.

In the example below, I changed the third keyframe to Ease Out - all the others are linear.

As expected, the volume fades according to the keyframes and will continue to do so for as long as Premiere open. But, when I export the sequence, the audio in the export is completely different (volume increases and decreases unexpectedly), and there is no evidence in Premiere that anything has changed - the volume levels look and sound normal.

It's only when I quit Premiere and relaunch it that I can see and hear what's happening. The picture below is the same audio clip after relaunching Premiere.

So, despite the clip looking and sounding normal in the original session (first picture), it actually exports according to the changes that have occurred in the second picture, and those changes are not evident at any point during the original session - only after Premiere is relaunched.

Has anyone else experienced this?

Cheers.

[jamieclarke]

Hi @the outward spiral -  Thanks for submitting your bug report. We need a few more details to try to help with the issue.
Please see, How do I write a bug report?

Sorry for the frustration.

[the outward spiral]

• Issue - Audio keyframes change their interpolation unexpectedly, but don't show evidence of it until restarting Premiere. 
• Adobe Premiere Pro version number: 25.1.0 (Build 73)
• Operating system - Windows 11 Pro, Version 24H2, Build 26100.2605, Windows Feature Experience Pack 1000.26100.36.0
• System Info:
  

  • CPU - Intel(R) Core(TM) i9-10885H CPU @ 2.40GHz 2.40 GHz

  • GPU - NVIDIA Quadro RTX 5000, 16 GB VRAM (GDDR6)

  • GPU driver - 553.50

  • RAM - 128 GB

  • Hard Drives - Internal:
    System: NVMe 1024 GB SSD
    Video Previews: NVMe 512 GB SSD
    Audio Previews: NVMe 256 GB SSD
    Documents: NVMe 256 GB SSD

  • Hard Drives - External:
    Footage: G-SPEED Shuttle 16 TB SSD RAID Thunderbolt 3 (8 x 2 TB SATA SSD)

• Video format: DJI Osmo Pocket 3 HEVC 80 Mbps (Max 100 Mbps)
• Audio format (where the problem occurred): MP3 320 kbps
• Workflow details: The project is part of a Production. The Production has a "Common Assets" project containing music and graphics that is shared among all projects in the Production.
• Steps to reproduce:
  1. Place an MP3 music clip from the Common Assets project into a sequence in another project.
  2. Select the newly placed clip in the sequence panel.
  3. Position the playhead in the sequence panel where a volume level keyframe is required.
  4. Click the Add-Remove Keyframe button in the audio track header.
  5. Repeat 3 & 4 until all clip keyframes are placed.
  6. Select one of the clip's keyframes in the sequence panel - I selected the second-last keyframe that preceds the last keyframe, which is set to -999 dB.
  7. Right-click the selected keyframe and change its interpolation from Linear to Ease Out.
  8. Observe visually (clip keyframes, lines and curves) and aurally (real-time sequence playback) to confirm the results.
  9. Export the sequence using a HEVC preset with AAC 48000 Hz 512 kbps audio.
• Expected result - Audio levels in the HEVC export should reproduce audio levels in the sequence.
• Actual result - Audio levels in the HEVC export increase and decrease unexpectedly - keyframe behaviour doesn't match the sequence.
• Additional info: 
  1. The expected (correct) keyframe behaviour remains intact during real-time sequence playback even after exporting unexpected results to HEVC. However, the unexpected keyframe behaviour becomes apparent after exiting and relaunching Premiere (see before and after screenshots in the original post).
  2. This issue occurs randomly (not every time).

[IanB_360]

Hi @the outward spiral ,

Would you say that this only happens with Mp3 audio files? I have been using camera audio and .wav files and have not been able to reproduce this error yet. You mentioned you have to export the sequence first and then close out of the program to see the changes happen. Does that mean you are exporting out media and what type of export are you making before you close out and notice the problem? Trying to see if I am missing something to get this recreated.

Thank you

Ian

[the outward spiral]

"Would you say that this only happens with Mp3 audio files?"

Can't say.

"You mentioned you have to export the sequence first and then close out of the program to see the changes happen."

No, exporting is not part of the cause. Exiting and relaunching premiere only makes the issue show itself visually and audibly during real-time playback, whereas, during the original session when the keyframes are added, the issue only shows itself audibly in exports - not during real-time playback.

"..what type of export are you making before you close out and notice the problem?"

HEVC