How to burn-in subtitle correctly into an MKV using ffmpeg?

[mrjayviper]

TLDR:

I sucessfully got an output video with correct audio and burned-in subtitle.

BUT the video length is now 1194:39::27. I also cannot use VLC's video seek slider.

The source video is only around 1:36:52.

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ffprobe results on my source.mt2s file

Program 1
Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:2[0x1101]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:3[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
Stream #0:4[0x1201]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)

This is the command that I used:

ffmpeg.exe -i "source.m2ts" -filter_complex "[0:v][0:s:1]overlay[v]" -c:v hevc_amf -quality 0 -rc 0 -qp_p 25 -qp_i 25  -c:a libfdk_aac -b:a
 320k -map "[v]" -map 0:a:1 "output.mkv"

If I used this command, it gives me correct video length and seeking in not a problem except I don't have burned-in subtitle.

ffmpeg.exe -i "source.m2ts" -c:v hevc_amf -quality 0 -rc 0 -qp_p 25 -qp_i 25  -c:a libfdk_aac -b:a 320k -map 0:v -map 0:a:1 "output.mkv"

[ProWo]

Remux it with mkvtoolnix.