I recorded the same programme with plex and HDHOMERUN software; the HDHOMERUN recording does capture subtitles but Plex does not.
PMS: Version 1.8.0.4109
HDHOMERUN CONNECT UK: Version 20170707beta2
ffprobe:
Recorded with HDHOMERUN software:
Input #0, mpegts, from '1ParaNorman 20121221 [20170805-1000].mpg':
Duration: 01:50:59.56, start: 88811.519144, bitrate: 1870 kb/s
Program 8385
Stream #0:0[0x5dd]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x5de](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 192 kb/s
Stream #0:2[0x5df](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, mono, s16p, 64 kb/s (visual impaired)
Stream #0:3[0x5fb](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:4[0x898]: Unknown: none ([11][0][0][0] / 0x000B)
Stream #0:5[0xbbd]: Unknown: none ([5][0][0][0] / 0x0005)
Recorded with Plex:
Input #0, mpegts, from '2ParaNorman (2012).ts':
Duration: 01:51:49.51, start: 1.400000, bitrate: 1897 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x101](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s
Stream #0:2[0x102](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, mono, s16p, 64 kb/s
Can plex actually capture DVB subtitles?
Here is a link to the files : https://www.dropbox.com/sh/w3riqfp5bv15v0y/AAAKnhI-9Q0kbCZUKmwS8gLua?dl=0
Please DM me for password.