Bug#1032972: handbrake: debian version of handbrake does NOT handle subtitles correctly

[Alain Ducharme <alain_ducharme@hotmail.com>]

Package: handbrake-cli
Version: 1.6.1+ds1-1

Ouch, yes, to confirm, upgraded to bookworm and now subtitles are broken
when using HandBrake to convert DVD to .mkv
(worked in bullseye handbrake-cli 1.3.1+ds1-2 and previous versions)

The problem occurs with all DVD subs I tried, both types: VOBSUB and CC608

# Example command:
HandBrakeCLI -i /dev/sr0 -o "7r0N.mkv" -t 1 -s 1 # Title 1, subtitle track 1

Produces lots of decavsub warnings (I'm guessing for every subtitle frame):
[warning] decavsub: track 1, invalid PTS

Result: video ok, but subtitles do not appear and/or not at the correct times.

upstream: https://github.com/HandBrake/HandBrake/issues/4029
...Handbrake depends on custom ffmpeg patches, hmmm...?