ffmpeg -i 03.mp4 -i 04.mp4  -i 06.mp4  -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" utki.mp4
ffmpeg version 2023-01-16-git-01f46f18db-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev7, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57. 44.100 / 57. 44.100
  libavcodec     59. 56.100 / 59. 56.100
  libavformat    59. 35.100 / 59. 35.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 54.100 /  8. 54.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '03.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2023-06-23T14:34:25.000000Z
    com.android.version: 10
  Duration: 00:01:48.06, start: 0.000000, bitrate: 20150 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 19665 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 30 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2023-06-23T14:34:25.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2023-06-23T14:34:25.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '04.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2023-06-23T14:35:26.000000Z
    com.android.version: 10
  Duration: 00:00:44.01, start: 0.000000, bitrate: 20095 kb/s
  Stream #1:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 19532 kb/s, SAR 1:1 DAR 16:9, 29.55 fps, 30 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2023-06-23T14:35:26.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
  Stream #1:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2023-06-23T14:35:26.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '06.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2023-06-25T17:25:26.000000Z
    com.android.version: 10
  Duration: 00:00:30.58, start: 0.000000, bitrate: 20569 kb/s
  Stream #2:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 19973 kb/s, SAR 1:1 DAR 16:9, 29.76 fps, 29.75 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2023-06-25T17:25:26.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
  Stream #2:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2023-06-25T17:25:26.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 (h264) -> concat
  Stream #0:1 (aac) -> concat
  Stream #1:0 (h264) -> concat
  Stream #1:1 (aac) -> concat
  Stream #2:0 (h264) -> concat
  Stream #2:1 (aac) -> concat
  concat -> Stream #0:0 (libx264)
  concat -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or setting vsync/fps_mode to vfr
[libx264 @ 000001f78db0c9c0] using SAR=1/1
[libx264 @ 000001f78db0c9c0] MB rate (8160000000) > level limit (16711680)
[libx264 @ 000001f78db0c9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000001f78db0c9c0] profile High, level 6.2, 4:2:0, 8-bit
[libx264 @ 000001f78db0c9c0] 264 - core 164 r3103 941cae6 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - 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=24 lookahead_threads=4 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 'utki.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    com.android.version: 10
    encoder         : Lavf59.35.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 1000k tbn
    Metadata:
      encoder         : Lavc59.56.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc59.56.100 aac
More than 1000 frames duplicated      0kB time=00:00:01.07 bitrate=   0.4kbits/s speed= 8.3x
More than 10000 frames duplicated
More than 100000 frames duplicated 72448kB time=00:00:01.07 bitrate=554527.2kbits/s dup=99463 drop=0 speed=0.00263x
av_interleaved_write_frame(): Immediate exit requested
Error muxing a packet for output file #0
frame=126501 fps=205 q=33.0 size=   91648kB time=00:00:01.07 bitrate=701486.6kbits/s dup=132617 drop=0 speed=0.00174x   Error writing trailer of utki.mp4: Immediate exit requested
frame=126501 fps=152 q=-1.0 Lsize=   91648kB time=00:00:01.11 bitrate=674593.6kbits/s dup=132617 drop=0 speed=0.00134x