[FFmpeg-user] concat Missing part2.mov

[Dan Norton]

I have two .mov files which were made on Debian 9 by running the
following:

$ ffmpeg -y -i "Norton 8mm Reel 04.mov" -ss 00:00:00 -to 00:20:00 -c
copy -bufsize 2048K part1.mov 
$ ffmpeg -y -ss 00:21:12 -i "Norton 8mm Reel 04.mov" -c copy -bufsize
2048K part2.mov

Viewed individually part1 and part2 are OK. When I tried to concatenate
them, the output is missing part2. Here's what I did:

$ ffmpeg -i "concat:part1.mov|part2.mov" -c copy
out.mov 
ffmpeg version 3.2.10-1~deb9u1 Copyright (c) 2000-2018 the
FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  configuration: --prefix=/usr --extra-version='1~deb9u1'
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libebur128 --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libmp3lame
--enable-libopenjpeg --enable-libopenmpt --enable-libopus
--enable-libpulse --enable-librubberband --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx
--enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394
--enable-libiec61883 --enable-chromaprint --enable-frei0r
--enable-libopencv --enable-libx264 --enable-shared libavutil      55.
34.101 / 55. 34.101 libavcodec     57. 64.101 / 57. 64.101
libavformat    57. 56.101 / 57. 56.101 libavdevice    57.  1.100 / 57.
1.100 libavfilter     6. 65.100 /  6. 65.100 libavresample   3.  1.
0 /  3.  1.  0 libswscale      4.  2.100 /  4.  2.100 libswresample
2.  3.100 /  2.  3.100 libpostproc    54.  1.100 / 54.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b324506d80] Found duplicated MOOV Atom.
Skipped it Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'concat:part1.mov|part2.mov': Metadata: encoder         : Lavf57.56.101
major_brand     : qt minor_version   : 512 compatible_brands: qt
Duration: 00:20:00.00, start: 0.000000, bitrate: 313526 kb/s Stream
#0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(top coded
first (swapped)), 1920x1080, 205645 kb/s, SAR 1:1 DAR 16:9, 29.97 fps,
29.97 tbr, 11988 tbn, 11988 tbc (default) Metadata: handler_name    :
DataHandler encoder         : Apple ProRes 422 (HQ) timecode        :
00:00:00;00 Stream #0:1(eng): Data: none (tmcd / 0x64636D74) Metadata:
handler_name    : DataHandler timecode        : 00:00:00;00 File
'out.mov' already exists. Overwrite ? [y/N] y Output #0, mov, to
'out.mov': Metadata: compatible_brands: qt major_brand     : qt
minor_version   : 512 encoder         : Lavf57.56.101 Stream #0:0(eng):
Video: prores (apch / 0x68637061), yuv422p10le(top coded first
(swapped)), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 205645 kb/s, 29.97
fps, 29.97 tbr, 11988 tbn, 11988 tbc (default) Metadata:
handler_name    : DataHandler encoder         : Apple ProRes 422 (HQ)
timecode        : 00:00:00;00 Stream mapping: Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=35964 fps= 57 q=-1.0 Lsize=30124305kB time=00:19:59.96
bitrate=205654.3kbits/s speed=1.91x video:30123882kB audio:0kB
subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
0.001403%