Multiple issues

[Selur]

About scenario 1: Problem seems to be related to the chapter selection.
For the video encoding:

mencoder   -endpos 624.258 -ovc raw -noskip -vf scale,format=i420 -forcedsubsonly -nosub -nosound -lavdopts threads=8 -really-quiet  -ofps  30000/1001 -of rawvideo -o - -dvd-device "C:\BA\VIDEO_TS" dvd://1 | ffmpeg -noautorotate -nostdin -threads 8 -an -sn -r 30000/1001 -video_size 720x480 -f rawvideo -i - -r 30000/1001 -vcodec ffvhuff -coder 0 -context 0 "C:\BA\DVD_input_test_2020-12-11@00_56_50_4810_03.avi"

is used. (instead dvd chapter selection should have been used)
For the audio extraction:

mplayer -v -mc 0 -vc dummy -nocorrect-pts -noconsolecontrols -nocorrect-pts -vc null -vo null -nocache -hardframedrop -aid 128 dvd://1 -dvd-device "C:\BA\VIDEO_TS"  -dumpaudio -dumpfile "C:\BA\iId_6_aid_128_lang_en_2020-12-11@00_56_50_4810_01.mp2"

is used.
Another problem is that mplayer crashed during the audio extraction 'Core dumped '
-> I'll look into it.

Scenario 2:
For some reason Hybrid used mencoder instead of Vapoursynth for the encoding.
I can't reproduce this here.
Does this also happen for you with the 2020.13.11.1 release?

Scenario 3: nothing to do here.

Cu Selur

Ps.: As a workaround: pack the source using MakeMKV into an mkv and convert that mkv with Hybrid.