Encoding a file using H.264 in MP4 format causes the audio and video to become out of sync.

When I use Media Encoder to transcode a video—for example, Apple ProRes 422 HQ with Linear PCM audio—After Effects and Premiere create a delay of about one frame between the audio and the video, which is very annoying. This problem only occurs when I set the output settings to MP4 H.264 with AAC audio.

As I need to deliver an MP4 H.264 file with AAC as the audio codec to my client, I have no choice but to use other video transcoding software. And in that case, I don’t have any issues with the audio and video being out of sync; the audio is exactly the same as in the source Apple ProRes file.

Is this a bug or have I configured the settings incorrectly?

I have attached my ME output preset along with a screenshot of the delay caused by the encoding .

Thanks.