Well, I'm not sure how it's relevant to my question on CLI switch for tag title but here you go.
[15:20:36] gtkgui: HandBrake 1.0.4 (2017040900) - Linux x86_64 -
https://handbrake.fr
[15:20:36] hb_init: starting libhb thread
[15:20:36] hb_init: starting libhb thread
[15:20:36] hb_init: starting libhb thread
[15:22:18] CPU: Intel(R) Core(TM) i5-4690K CPU @ 3.50GHz
[15:22:18] - Intel microarchitecture Haswell
[15:22:18] - logical processor count: 4
[15:22:18] hb_scan: path=/home/ed/Videos/Webcam/2017-11-10-152135.webm, title_index=0
udfread ERROR: ECMA 167 Volume Recognition failed
disc.c:274: failed opening UDF image /home/ed/Videos/Webcam/2017-11-10-152135.webm
disc.c:352: error opening file BDMV/index.bdmv
disc.c:352: error opening file BDMV/BACKUP/index.bdmv
[15:22:18] bd: not a bd - trying as a stream/file instead
libdvdnav: Using dvdnav version 5.0.1
libdvdread: Encrypted DVD support unavailable.
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[15:22:18] dvd: not a dvd - trying as a stream/file instead
Input #0, matroska,webm, from '/home/ed/Videos/Webcam/2017-11-10-152135.webm':
Duration: 00:00:11.87, start: 0.000000, bitrate: N/A
Stream #0:0(eng): Video: vp8
yuv420p, 1920x1080, PAR 1:1 DAR 16:9
15.08 fps, 1k tbn (default)
Metadata:
title : Video
Stream #0:1(eng): Audio: vorbis
44100 Hz, mono, fltp (default)
Metadata:
title : Audio
[15:22:18] scan: decoding previews for title 1
[15:22:18] scan: audio 0x1: vorbis, rate=44100Hz, bitrate=1 English (Vorbis) (1.0 ch)
[15:22:18] scan: 10 previews, 1920x1080, 15.083 fps, autocrop = 0/0/0/0, aspect 16:9, PAR 1:1
[15:22:18] libhb: scan thread found 1 valid title(s)