I'm having problems audio encoding to aac format

[Selur]

When video encoding starts, the audio track is only 6 minutes 22 seconds long.

Sounds like there's a problem with the extraction or the conversion of the audio.

So looking at the extraction:

"C:\Program Files\Hybrid\64bit\mplayer.exe" -v -mc 0 -vc dummy -nocorrect-pts -noconsolecontrols -nocorrect-pts -vc null -vo null -nocache -hardframedrop -aid 128  -dumpaudio -dumpfile "D:\5\iId_3_aid_128_DELAY_-43ms_2020-10-23@21_00_01_9410_01.ac3" "E:\Untitle.VOB"

Side note: Whenever I see single vob files I suspect folks some how merged a DVD into a single vob file in a non proper way, i.e. by not properly adjusting the headers in the file. Hope this is not the case here.
Since you did not care to read the sticky: What happens if you call the above call inside a Windows Command Prompt?
Any errors or warnings?
Is the size of the created "D:\5\iId_3_aid_128_DELAY_-43ms_2020-10-23@21_00_01_9410_01.ac correct?

If there are no warnings/errors during the audio extraction, check whether there are any during the conversion by calling:

"C:\Program Files\Hybrid\64bit\ffmpeg.exe" -y -threads 8 -i "D:\5\iId_3_aid_128_DELAY_-43ms_2020-10-23@21_00_01_9410_01.ac3" -c:a aac -strict -2 -b:a 192k -ar 48000 -channel_layout 5.1 "D:\5\iId_3_aid_128_DELAY_-43ms_2020-10-23@21_00_01_9410_02.aac"

inside a Windows Command Prompt.

Cu Selur

Ps.: not going to look at a zip full of images,...