[Cin] BD subtitles <> dvd subtitles

[Andrew Randrianasulu]

>From what I remember CinGG can create dvd subtitles but not BD (bluray)
subtitles.

May be this project can convert them (qt5, meson) ?

https://aur.archlinux.org/packages/bdsup2subpp-git/

slightly older src with appimage

https://github.com/amichaeltm/BDSup2SubPlusPlus

original java-based tool
 https://github.com/mjuhasz/BDSup2Sub

description
===
BDSup2Sub

A tool to convert and tweak bitmap based subtitle streams
BDSup2Sub is a tool initially created to convert captions demuxed from a
Blu-Ray transport stream (M2TS) into the DVD VobSub format (SUB/IDX) used
by many DVD authoring tools - hence the name. Many more features were added
over time as was support for other formats. So in the meantime the name
seems a little inappropriate. In a nutshell, it's a subtitle conversion
tool for image based stream formats with scaling capabilities and some
other nice features.

Supported Formats
Blu-Ray SUP
Sony BDN XML (as used by Sonic Scenarist HDMV)
HD-DVD SUP (import only)
VobSub (SUB/IDX)
DVD-SUP (SUP/IFO)

What it can do
convert any supported import format to any supported export format
add a fixed delay to all timestamps
perform a frame rate conversion e.g. for pal speedup
synchronize time stamps to output frame rate
edit times and position of each caption
control all features (except editing) from the command line
move all captions inside or outside a given area or horizontally
crop the target screen size
scale up/down with a variety of filters (from bilinear over bicubic to
Lanczos3 and Mitchell)
edit "forced" flags
exclude single captions from export
erase rectangular regions of a caption
scale captions independently of screen size
automatically remove fade in/out from imported subtitle streams.
export the target palette in PGCEdit text format (RGB values 0..255)
edit the imported DVD palette when input is either VobSub or SUP/IFO
edit the frame palette and alpha values when input is either VobSub or
SUP/IFO
set/clear forced flags for all captions

What it can't do

BDSup2Sub only supports image based subtitle streams.
====


so..

in theory CinGG's subtitle output can me MicroDVD'S .udvd but then making
those into graphical dvd subtitles will require ffmpeg called with right
params

I found this post converting DVB subtitles to DVD subtitles inside mkv and
also image of titular bdsup2sub

https://forum.videohelp.com/threads/386350-reencoding-
dvbsub-to-dvdsub-using-ffmpeg

Subtitle options:
-s size set frame size (WxH or abbreviation)
-sn disable subtitle
-scodec codec force subtitle codec ('copy' to copy stream)
-stag fourcc/tag force subtitle tag/fourcc
-fix_sub_duration fix subtitles duration
-canvas_size size set canvas size (WxH or abbreviation)
-spre preset set the subtitle options to the indicated preset

https://trac.ffmpeg.org/wiki/HowToConvertSubtitleToASS

 ..S... = Subtitle codec
 DES ass Advanced SubStation Alpha subtitle
 DES dvbsub DVB subtitles
 DES dvdsub DVD subtitles
 D S microdvd MicroDVD subtitle
 D S pgssub HDMV Presentation Graphic Stream subtitles
 DES srt SubRip subtitle
 DES xsub DivX subtitles (XSUB)

for me system ffmpeg output (4.4)

DES... ass ASS (Advanced SSA) subtitle (decoders: ssa ass ) (encoders: ssa
ass )
 DES... dvb_subtitle DVB subtitles (decoders: dvbsub ) (encoders: dvbsub )
 DES... dvd_subtitle DVD subtitles (decoders: dvdsub ) (encoders: dvdsub )
 D.S... hdmv_pgs_subtitle HDMV Presentation Graphic Stream subtitles
(decoders: pgssub )
 ..S... hdmv_text_subtitle HDMV Text subtitle
 D.S... jacosub JACOsub subtitle
 D.S... microdvd MicroDVD subtitle
 D.S... mpl2 MPL2 subtitle
 D.S... pjs PJS (Phoenix Japanimation Society) subtitle
 D.S... realtext RealText subtitle
 D.S... sami SAMI subtitle
 ..S... srt SubRip subtitle with embedded timing
 ..S... ssa SSA (SubStation Alpha) subtitle
 D.S... stl Spruce subtitle format
 DES... subrip SubRip subtitle (decoders: srt subrip ) (encoders: srt
subrip )
 D.S... subviewer SubViewer subtitle
 D.S... subviewer1 SubViewer v1 subtitle
 D.S... vplayer VPlayer subtitle
 DES... webvtt WebVTT subtitle
$

so in theory chain should be :

CINGG > udvd /MicroDVD  output - > ffmpeg - > dvd subtitles - > BDsup2sub -
 -> tsmuxer (as PGS stream) (or I found old message saying bdwrite can mux
BD subtitles, just there was no more notes about this)

https://lists.cinelerra-cv.org/pipermail/cinelerra/2017q1/005829.html

Again, our subtitles section a bit bare, may be someone can try said tools
and write a bit more on gotchas encountered...

And still, Andrea/Phyllis I sort of insist on adding at least few lines
about mp4box and tsmuxer alternative muxers (may be to newly added Codecs
and Formats?) because this info (if you are not seasoned video enthusiast)
a bit hard to find..  I was making circles around this topic for nearly
year! A lot of windows programs, or specialized editors like

https://github.com/hguandl/ass2bdnxml with source but require some windows
version of avisynth (avisynth+ available for linux, but apparently this
tool input module based on much older x264 avisynth input! so no linux...)


https://github.com/magiruuvelvet/jimaku-editor/blob/master/pgs-encoder/main.c

mostly concerned with Japanese/Chinese graphical subtitles..
and whole encoder probably was developed back in 2009 by some user who
badly needed those graphical subtitles
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