[HELP] Hybrid introducing audio delay that is not present in source material

[Selur]

I think there is still something 'off' with that MP4Box version.

I got a video where VirtualDub2 shows this wavefront: https://ibb.co/v4YpQyv

I then reencoded the audio with faac and used mp4box (MP4Box - GPAC version 1.1.0-DEV-rev1314-gb9b5abb0e-ab-suite) for muxing.

First with no additional delay:

MP4Box -add "E:\Output\video.m4v"#video:fps=25:name="":lang="" -add "E:\Output\audio.aac"#audio:name="":lang="" -mpeg4 -itags tool="Hybrid 2021.10.15.1" -tmp "E:\Output" -new "E:\Output\faac_nodelay.mp4

this gave me:
https://ibb.co/hKPDVyL
so I need a delay of around half a frame.

Using a delay of 20:

MP4Box -add "E:\Output\video.m4v"#video:fps=25_delay=20:name="":lang="" -add "E:\Output\audio.aac"#audio:name="":lang="" -mpeg4 -itags tool="Hybrid 2021.10.15.1" -tmp "E:\Output" -new "E:\Output\faac_20.mp4

gave me:
https://ibb.co/2vb7Z4S
No effect at all,...

Using a delay of 40:

MP4Box -add "E:\Output\video.m4v"#video:fps=25_delay=40:name="":lang="" -add "E:\Output\audio.aac"#audio:name="":lang="" -mpeg4 -itags tool="Hybrid 2021.10.15.1" -tmp "E:\Output" -new "E:\Output\faac_40.mp4

gave me:
https://ibb.co/wwNZ3rJ
No effect at all,...

-> I'll compile a new MP4Box version based on the latest code over night and will do some more testing and if the issue isn't fixed I'll report it to the mp4box authors,..

Cu Selur