Can't copy Blu-ray subtitles from .m2ts to .m2ts

[rhazor]

Summary of the bug: Can't copy PGS/SUP subtitle files from Blu-ray .m2ts file to new .m2ts file. No encoding, just remuxing.

How to reproduce:

ffmpeg -analyzeduration 200M -probesize 200M -i "test.m2ts" -map 0:v -map 0:a -map 0:s -c copy new.m2ts
ffmpeg version N-93774-gfec4212d8e Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.3.1 (GCC) 20190414
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 26.101 / 56. 26.101
  libavcodec     58. 52.101 / 58. 52.101
  libavformat    58. 27.103 / 58. 27.103
  libavdevice    58.  7.100 / 58.  7.100
  libavfilter     7. 50.100 /  7. 50.100
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
[mpegts @ 000001e6d4b9adc0] DTS discontinuity in stream 2: packet 4 with DTS 402220885, packet 5 with DTS 402403095
[mpegts @ 000001e6d4b9adc0] DTS discontinuity in stream 2: packet 12 with DTS 402406850, packet 13 with DTS 402635828
Input #0, mpegts, from 'test.m2ts':
  Duration: 00:01:00.60, start: 4441.120000, bitrate: 31343 kb/s
  Program 1
    Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
    Stream #0:1[0x1100](eng): Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, 5.1(side), s32p (24 bit)
    Stream #0:2[0x1200](eng): Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080
File 'new.m2ts' already exists. Overwrite ? [y/N] y
Output #0, mpegts, to 'new.m2ts':
  Metadata:
    encoder         : Lavf58.27.103
    Stream #0:0: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 90k tbn, 90k tbc
    Stream #0:1(eng): Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, 5.1(side), s32p (24 bit)
    Stream #0:2(eng): Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
[mpegts @ 000001e6e0cc19c0] Non-monotonous DTS in output stream 0:2; previous: 2520040, current: 2520038; changing to 2520041. This may result in incorrect timestamps in the output file.
[mpegts @ 000001e6e0cc19c0] Non-monotonous DTS in output stream 0:2; previous: 2705988, current: 2705986; changing to 2705989. This may result in incorrect timestamps in the output file.
frame= 1453 fps=0.0 q=-1.0 Lsize=  242946kB time=00:01:00.59 bitrate=32843.3kbits/s speed= 112x
video:191759kB audio:28143kB subtitle:13kB other streams:0kB global headers:0kB muxing overhead: 10.472713%

If you run MediaInfo on the new file it shows that subtitle track became a 'menu':

Menu
ID                                       : 4096 (0x1000)
Menu ID                                  : 1 (0x1)
Duration                                 : 59 s 601 ms
List                                     : 256 (0x100) (AVC) / 257 (0x101) (DTS, English)
Language                                 :  / English
Service name                             : Service01
Service provider                         : FFmpeg
Service type                             : digital television

When playing new file, there is no subtitles.

Tested on multiple different discs.

[Carl Eugen Hoyos]

See #2622.

[rhazor]

Nice.