[FFmpeg-user] Error while hardcoding subtitles (Invalid object location)

[Sergey_S]

ffmpeg version 3.4.5
Iam trying to transcode an mpeg2 ts stream containing a separate stream of
dvb subtitles
While executing command: ffmpeg -i Ep1.ts -vcodec libx264 -s 720x576 -g 50
-keyint_min 50 -sc_threshold 0 -vprofile main -level 4.1 -b:v 3000K
-maxrate 3000K -bufsize 6000K -r 25.000 -acodec aac -ar 48000 -ac 2 -ab
128k -async 2 -filter_complex "[0:v][0:s:1]overlay[v]" -map "[v]" -map 0:a
-f mpegts 8.ts
I get an error [dvbsub @ 0x1606b00] Invalid object location! 952-952 0-161
00 and subs don't burn in.
Please kindly advise/ Thanks.