FFmpeg only joins 2 videos of 17

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I’m trying to join multiple video files using xfade transitions. But I only get 2 videos joined. What I’m doing wrong ?

ffmpeg \
-i  video0.mp4 \
-i  video1.mp4 \
-i  video10.mp4 \
-i  video11.mp4 \
-i  video12.mp4 \
-i  video13.mp4 \
-i  video14.mp4 \
-i  video15.mp4 \
-i  video16.mp4 \
-i  video17.mp4 \
-i  video18.mp4 \
-i  video2.mp4 \
-i  video4.mp4 \
-i  video5.mp4 \
-i  video6.mp4 \
-i  video7.mp4 \
-i  video8.mp4 \
-filter_complex "\
[0][1]xfade=transition=slidedown:duration=1:offset=4[v1]; \
[v1][2]xfade=transition=pixelize:duration=1:offset=4[v2]; \
[v2][3]xfade=transition=slidedown:duration=1:offset=4[v3]; \
[v3][4]xfade=transition=pixelize:duration=1:offset=4[v4]; \
[v4][5]xfade=transition=slideup:duration=1:offset=4[v5]; \
[v5][6]xfade=transition=slideleft:duration=1:offset=4[v6]; \
[v6][7]xfade=transition=vdslice:duration=1:offset=4[v7]; \
[v7][8]xfade=transition=slideup:duration=1:offset=4[v8]; \
[v8][9]xfade=transition=vdslice:duration=1:offset=4[v9]; \
[v9][10]xfade=transition=wipedown:duration=1:offset=4[v10]; \
[v10][11]xfade=transition=hblur:duration=1:offset=4[v11]; \
[v11][12]xfade=transition=slideup:duration=1:offset=4[v12]; \
[v12][13]xfade=transition=pixelize:duration=1:offset=4[v13]; \
[v13][14]xfade=transition=vdslice:duration=1:offset=4[v14]; \
[v14][15]xfade=transition=slideleft:duration=1:offset=4[v15]; \
[v15][16]xfade=transition=vdslice:duration=1:offset=4[vout] \
" -map "[vout]" joined.mp4

There is no error output, just this:


Stream mapping:
  Stream #0:0 (h264) -> xfade:main
  Stream #1:0 (h264) -> xfade:xfade
  Stream #2:0 (h264) -> xfade:xfade
  Stream #3:0 (h264) -> xfade:xfade
  Stream #4:0 (h264) -> xfade:xfade
  Stream #5:0 (h264) -> xfade:xfade
  Stream #6:0 (h264) -> xfade:xfade
  Stream #7:0 (h264) -> xfade:xfade
  Stream #8:0 (h264) -> xfade:xfade
  Stream #9:0 (h264) -> xfade:xfade
  Stream #10:0 (h264) -> xfade:xfade
  Stream #11:0 (h264) -> xfade:xfade
  Stream #12:0 (h264) -> xfade:xfade
  Stream #13:0 (h264) -> xfade:xfade
  Stream #14:0 (h264) -> xfade:xfade
  Stream #15:0 (h264) -> xfade:xfade
  Stream #16:0 (h264) -> xfade:xfade
  xfade -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x559d2de188c0] using SAR=1/1
[libx264 @ 0x559d2de188c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x559d2de188c0] profile High 4:4:4 Predictive, level 3.1, 4:4:4, 8-bit
[libx264 @ 0x559d2de188c0] 264 - core 163 r3060 5db6aa6 - H.264/MPEG-4 AVC codec - Copyleft 2003-2021 - 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=4 threads=6 lookahead_threads=1 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=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'spojeno.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.76.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv444p(tv, progressive), 1200x670 [SAR 13401:13400 DAR 40203:22445], q=2-31, 25 fps, 12800 tbn (default)
    Metadata:
      encoder         : Lavc58.134.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=  350 fps= 23 q=-1.0 Lsize=    1294kB time=00:00:13.88 bitrate= 763.9kbits/s speed=0.901x
video:1289kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.379462%
[libx264 @ 0x559d2de188c0] frame I:2     Avg QP:19.88  size: 22310
[libx264 @ 0x559d2de188c0] frame P:96    Avg QP:20.30  size:  9926
[libx264 @ 0x559d2de188c0] frame B:252   Avg QP:23.44  size:  1278
[libx264 @ 0x559d2de188c0] consecutive B-frames:  3.7%  0.6%  0.9% 94.9%
[libx264 @ 0x559d2de188c0] mb I  I16..4: 31.2% 60.9%  7.9%
[libx264 @ 0x559d2de188c0] mb P  I16..4:  4.7%  4.2%  1.1%  P16..4: 37.8% 11.6%  7.7%  0.0%  0.0%    skip:32.9%
[libx264 @ 0x559d2de188c0] mb B  I16..4:  0.1%  0.1%  0.1%  B16..8: 38.4%  0.6%  0.0%  direct: 0.1%  skip:60.7%  L0:50.0% L1:49.1% BI: 0.9%
[libx264 @ 0x559d2de188c0] 8x8 transform intra:44.7% inter:82.1%
[libx264 @ 0x559d2de188c0] coded y,u,v intra: 31.0% 10.4% 8.4% inter: 4.9% 1.3% 1.0%
[libx264 @ 0x559d2de188c0] i16 v,h,dc,p: 20% 67%  6%  7%
[libx264 @ 0x559d2de188c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 37% 23%  2%  3%  2%  3%  2%  5%
[libx264 @ 0x559d2de188c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 44% 13%  2%  2%  2%  2%  1%  2%
[libx264 @ 0x559d2de188c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x559d2de188c0] ref P L0: 55.5% 10.2% 24.1% 10.3%
[libx264 @ 0x559d2de188c0] ref B L0: 88.7%  9.2%  2.1%
[libx264 @ 0x559d2de188c0] ref B L1: 96.1%  3.9%
[libx264 @ 0x559d2de188c0] kb/s:754.06

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