me$ ffmpeg -f concat -safe 0 -i mylist.txt -c copy.txt -c copy joined4k.mov

ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers

  built with Apple LLVM version 9.1.0 (clang-902.0.39.2)

  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma

  libavutil      56. 14.100 / 56. 14.100

  libavcodec     58. 18.100 / 58. 18.100

  libavformat    58. 12.100 / 58. 12.100

  libavdevice    58.  3.100 / 58.  3.100

  libavfilter     7. 16.100 /  7. 16.100

  libavresample   4.  0.  0 /  4.  0.  0

  libswscale      5.  1.100 /  5.  1.100

  libswresample   3.  1.100 /  3.  1.100

  libpostproc    55.  1.100 / 55.  1.100

Input #0, concat, from 'mylist.txt':

  Duration: N/A, start: 0.000000, bitrate: 623016 kb/s

    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 4096x1716, 618408 kb/s, 24 fps, 24 tbr, 12288 tbn, 12288 tbc

    Metadata:

      handler_name    : DataHandler

    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 5.1, s16, 4608 kb/s

    Metadata:

      handler_name    : DataHandler

Output #0, mov, to 'joined4k.mov':

  Metadata:

    encoder         : Lavf58.12.100

    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 4096x1716, q=2-31, 618408 kb/s, 24 fps, 24 tbr, 12288 tbn, 12288 tbc

    Metadata:

      handler_name    : DataHandler

    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 5.1, s16, 4608 kb/s

    Metadata:

      handler_name    : DataHandler

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)

Press [q] to stop, [?] for help

frame=107988 fps=9.2 q=-1.0 size=346950144kB time=01:14:59.45 bitrate=631679.5kbits/s speed=0.382x