ffmpeg stream segmenting loses some frames after initialization

I use this ffmep command to get stream from usb camera and segment videos of 1 seconds

ffmpeg -i /dev/video0 -pix_fmt yuv420p -vcodec libx264 \
                  -r 15 -x264opts keyint=15:min-keyint=15 -crf 19 \
                  -vf drawtext='expansion=strftime:fontfile='/usr/share/fonts/cantarell/Cantarell-Light.otf':fontsize=28:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=1:text='%Y-%m-%d\ %H\\\\:%m\\\\:%S':x=200:y=200'" \
                  -f segment -reset_timestamps 1 -segment_time 1 -segment_format mp4 \
                  -strftime 1 -map 0 output/%Y-%m-%d-%H:%M:%S.mp4 \

The output that I get is

Parsed_drawtext_0 @ 0x5633950a66c0] Using "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
[Parsed_drawtext_0 @ 0x5633950a66c0] expansion=strftime is deprecated.
[libx264 @ 0x5633950a1680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5633950a1680] profile High, level 3.1
[libx264 @ 0x5633950a1680] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=10 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=19.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:14.mp4' for writing
Output #0, segment, to 'output/%Y-%m-%d-%H:%M:%S.mp4':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720, q=-1--1, 10 fps, 10240 tbn, 10 tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:18.mp4' for writing
[segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:19.mp4' for writing
[segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:20.mp4' for writing

You can clearly see that first video is output/2020-02-17-13:39:14.mp4, then something happens and the next video is output/2020-02-17-13:39:18.mp4. After this I lose 3 seconds and my whole videos are delayed by 3 seconds.

Is my command incorrect or is there something else could cause it?