HALF FRAME MUTE /DELAY AUDIO H264 H265 IN PREMIERE PRO

[Odobe]

We are working with an audio partner who has noticed that our mp4s made in h264 (and sometimes h265) are mute for approx half a frame. The same is true of Media Encoder and Premiere pro.

When we import these into Premiere Pro the Waveform aligns with the WAV supplied by the partner.
But in Davinci you can see there is a muted and delayed half frame.

Exporting the same audio clip from Davinci to mp4 we aren't seeing the same delay/muting.

The Quicktime is fine.

I would love to have a workaround for this so that we can continue to deliver Mp4s from Premiere or Media Encoder.

[Dani_V.]

Hi @Odobe,

Thank you for submitting a bug report. A few questions so we can look further into this: What version of Premiere Pro are you working with? Do you know what software the audio partner is picking up on the discrepancy with, is it in DaVinci Resolve as well? Is the WAV sample rate the same as the export sequence sample rate?

Just to clarify, your .mp4 files are audio only with no video at all, and that half-frame of no sound/mute is actually off-setting the entire track by that same half-frame within DaVinci Resolve, correct?

Sorry for the frustration,
Dani

[Odobe]

@Dani_V.  We are using Version 25.2.1 Build2 - across ten computers currently - the problem occurs across the computers.

Our audio partner is using Protools.

The sample rate in both the original wav and the sequence is 48khz.

I removed video as it is just an audio issue.

[Rach McIntire]

Hi @Odobe, 

Please give me more details about your workflow for context and so I can try to reproduce it better.

Am I correct that you are sending a ref QT to an audio facility, and the audio in the ref QT is off by half a frame?  Or is this a file you are receiving that is off?  

I'm glad to hear the sample rates match. What frame rate are you working with/ exporting to so I can match it?  Also, just double-check: When you say the project occurs across all the systems, are you using the same project to test it across systems or creating a new one each time?

I hope we can help you soon.

[Odobe]

Hi Rach, 

I started the process again - this time taking a wav from the free Audtion sfx packs.

I created a new timeline based on the wav and exported as both Quicktime, h264 in a quicktime wrapper, h264 in an mp4 wrapper etc. 

You can see that there is a delay to the audio in the mp4 which doesnt occur in the quicktime.

When the same process happens in Davinci the h264 in mp4 wrapper doesnt have the same amount of delay (if any visible).

Image attached below showing the delay.