Hi, I am seeing what looks like a regression bug in concat. It stops after the first file, and this only appeared when the input files are from the older Mobius camera. I get the same error trying a version of ffmpeg I built 2019-12-09. But ffmpeg-3.3 from 2017 DOES work, and switching over to the debian9-x64 system, ffmpeg provided from the package manager from 2019-05-21 does work also. Are my compile options causing this? or is the (newest from git) concat filter the issue? There's also a possibility the input files are relevant to the problem, since they are the same as in the memory leak with amix... so I'll include ffprobe at the end, after one fail output and 2 working output. $ cat concat-list-17614.txt file '20170614_0848_driving-Hwy395-CVL_rec12371.mov' file '20170614_0851_driving-Hwy395-CVL_rec12372.mov' file '20170614_0854_driving-Hwy395-S-mp252-250_view_MatsenCrk-repaired_rec12373.mov' file '20170614_0857_driving-Hwy395-CVL_rec12374.mov' file '20170614_0900_driving-Hwy395-CVL_rec12375.mov' file '20170614_0903_driving-Hwy395-CVL_rec12376.mov' file '20170614_0906_driving-Hwy395-crossColumbiaRiver-bridgeWork_rec12377.mov' file '20170614_0909_driving-Hwy395-CVL_rec12378.mov' file '20170614_0912_driving-Hwy395-CVL_rec12379.mov' file '20170614_0915_driving-Hwy395-CVL_rec12380.mov' file '20170614_0918_driving-Hwy395-CVL_rec12381.mov' file '20170614_0921_driving-Hwy395-CVL-arriveWalmart_rec12382.mov' $ ls -rw-r--r-- 1 sandreas  192954171 2017-06-14 08:48 20170614_0848_driving-Hwy395-CVL_rec12371.mov -rw-r--r-- 1 sandreas  193281843 2017-06-14 08:51 20170614_0851_driving-Hwy395-CVL_rec12372.mov -rw-r--r-- 1 sandreas  193150771 2017-06-14 08:54 20170614_0854_driving-Hwy395-S-mp252-250_view_MatsenCrk-repaired_rec12373.mov -rw-r--r-- 1 sandreas  193150779 2017-06-14 08:57 20170614_0857_driving-Hwy395-CVL_rec12374.mov -rw-r--r-- 1 sandreas  192954163 2017-06-14 09:00 20170614_0900_driving-Hwy395-CVL_rec12375.mov -rw-r--r-- 1 sandreas  193183539 2017-06-14 09:03 20170614_0903_driving-Hwy395-CVL_rec12376.mov -rw-r--r-- 1 sandreas  193150771 2017-06-14 09:06 20170614_0906_driving-Hwy395-crossColumbiaRiver-bridgeWork_rec12377.mov -rw-r--r-- 1 sandreas  192986931 2017-06-14 09:09 20170614_0909_driving-Hwy395-CVL_rec12378.mov -rw-r--r-- 1 sandreas  192986939 2017-06-14 09:12 20170614_0912_driving-Hwy395-CVL_rec12379.mov -rw-r--r-- 1 sandreas  192855859 2017-06-14 09:15 20170614_0915_driving-Hwy395-CVL_rec12380.mov -rw-r--r-- 1 sandreas  193216315 2017-06-14 09:18 20170614_0918_driving-Hwy395-CVL_rec12381.mov -r--r--r-- 1 sandreas  188955475 2017-06-14 09:21 20170614_0921_driving-Hwy395-CVL-arriveWalmart_rec12382.mov $ ffmpeg -f concat -i concat-list-17614.txt -c copy 20170614_driving-Hwy395-Colville_concat-current.mov ffmpeg version N-96573-g73aab08d9d Copyright (c) 2000-2020 the FFmpeg developers   built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516   configuration: --prefix=/usr/local --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libx264 --enable-libopenjpeg --enable-libfreetype --disable-doc --disable-htmlpages --disable-podpages --enable-shared --enable-libvpx --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib/i386-linux-gnu --enable-libass --enable-libtesseract --extra-cflags=-msse2 --enable-openssl --enable-nonfree   libavutil      56. 38.100 / 56. 36.101   libavcodec     58. 67.100 / 58. 64.101   libavformat    58. 37.100 / 58. 35.101   libavdevice    58.  9.103 / 58.  9.101   libavfilter     7. 72.100 /  7. 68.100   libswscale      5.  6.100 /  5.  6.100   libswresample   3.  6.100 /  3.  6.100   libpostproc    55.  6.100 / 55.  6.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2569580] Auto-inserting h264_mp4toannexb bitstream filter Guessed Channel Layout for Input Stream #0.1 : mono Input #0, concat, from 'concat-list-17614.txt':   Duration: N/A, start: 0.000000, bitrate: 8380 kb/s     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 60k tbc     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : VideoHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, mono, s16, 512 kb/s     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : SoundHandler Output #0, mov, to '20170614_driving-Hwy395-Colville_concat-current.mov':   Metadata:     encoder         : Lavf58.35.101     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, q=2-31, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 30k tbc     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : VideoHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, mono, s16, 512 kb/s     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : SoundHandler Stream mapping:   Stream #0:0 -> #0:0 (copy)   Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help [concat @ 0x255f540] h264_mp4toannexb filter failed to receive output packetbits/s speed=55.7x concat-list-17614.txt: Invalid argument frame= 5430 fps=1699 q=-1.0 Lsize=  185175kB time=00:03:00.99 bitrate=8381.3kbits/s speed=56.6x video:173785kB audio:11312kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.041530% ▶Feb27_0854.55▶ $ ffmpeg-3.3 -f concat -i concat-list-17614.txt -c copy 20170614_driving-Hwy395-Colville_concat-v3.3.mov ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers   built with gcc 4.9.2 (Debian 4.9.2-10)   configuration: --prefix=/usr/local --enable-gpl --enable-postproc --enable-swscale --enable-libmp3lame --enable-libvorbis --enable-libx264 --enable-pthreads --enable-libopenjpeg --enable-nonfree --disable-ffserver --disable-network --enable-libfreetype --enable-libfontconfig --disable-doc --disable-htmlpages --disable-podpages --enable-shared --enable-libvpx --enable-libtesseract --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib/i386-linux-gnu   WARNING: library configuration mismatch   avutil      configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   avcodec     configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   avformat    configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   avdevice    configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   avfilter    configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   swscale     configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   swresample  configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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   postproc    configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/i386-linux-gnu --incdir=/usr/include/i386-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. 58.100 / 55. 34.101   libavcodec     57. 89.100 / 57. 64.101   libavformat    57. 71.100 / 57. 56.101   libavdevice    57.  6.100 / 57.  1.100   libavfilter     6. 82.100 /  6. 65.100   libswscale      4.  6.100 /  4.  2.100   libswresample   2.  7.100 /  2.  3.100   libpostproc    54.  5.100 / 54.  1.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x852dbc0] Auto-inserting h264_mp4toannexb bitstream filter Guessed Channel Layout for Input Stream #0.1 : mono Input #0, concat, from 'concat-list-17614.txt':   Duration: N/A, start: 0.000000, bitrate: 8380 kb/s     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 60k tbc     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, mono, s16, 512 kb/s     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler Output #0, mov, to '20170614_driving-Hwy395-Colville_concat-v3.3.mov':   Metadata:     encoder         : Lavf57.56.101     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, q=2-31, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 30k tbc     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, mono, s16, 512 kb/s     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler Stream mapping:   Stream #0:0 -> #0:0 (copy)   Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help [mov,mp4,m4a,3gp,3g2,mj2 @ 0x852e140] Auto-inserting h264_mp4toannexb bitstream filtered= 149x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=69.5x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=59.8x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=53.7x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=49.3x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=47.1x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=45.9x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=44.9x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=44.4x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=43.9x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8534080] Auto-inserting h264_mp4toannexb bitstream filtered=43.3x frame=65059 fps=1293 q=-1.0 Lsize= 2218660kB time=00:36:09.10 bitrate=8379.2kbits/s speed=43.1x video:2082252kB audio:135508kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.040559% ▶Feb27_0856.13▶ $ ls -rw-r--r-- 1 sandreas  189618852 2020-02-27 08:54 20170614_driving-Hwy395-Colville_concat-current.mov -rw-r--r-- 1 sandreas 2271907937 2020-02-27 08:56 20170614_driving-Hwy395-Colville_concat-v3.3.mov debian9-x64 $ /usr/bin/ffmpeg -f concat -i concat-list-17614.txt -c copy 20170614_driving-Hwy395-Colville_concat-debian9.mov ffmpeg version 3.2.14-1~deb9u1 Copyright (c) 2000-2019 the FFmpeg developers   built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 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 @ 0x5604d9d37360] Auto-inserting h264_mp4toannexb bitstream filter Guessed Channel Layout for Input Stream #0.1 : mono Input #0, concat, from 'concat-list-17614.txt':   Duration: N/A, start: 0.000000, bitrate: 8380 kb/s     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 60k tbc     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, mono, s16, 512 kb/s     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler Output #0, mov, to '20170614_driving-Hwy395-Colville_concat-debian9.mov':   Metadata:     encoder         : Lavf57.56.101     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, q=2-31, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 30k tbc     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, mono, 512 kb/s     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : DataHandler Stream mapping:   Stream #0:0 -> #0:0 (copy)   Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter73x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter01x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.5x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.2x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.1x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.2x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.9x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.7x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.3x [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5604d9d37d80] Auto-inserting h264_mp4toannexb bitstream filter.1x frame=65059 fps=1840 q=-1.0 Lsize= 2218660kB time=00:36:09.10 bitrate=8379.2kbits/s speed=61.3x video:2082252kB audio:135508kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.040559% $ ffprobe 20170614_0848_driving-Hwy395-CVL_rec12371.mov ffprobe version N-96573-g73aab08d9d Copyright (c) 2007-2020 the FFmpeg developers   built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516   configuration: --prefix=/usr/local --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libx264 --enable-libopenjpeg --enable-libfreetype --disable-doc --disable-htmlpages --disable-podpages --enable-shared --enable-libvpx --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib/i386-linux-gnu --enable-libass --enable-libtesseract --extra-cflags=-msse2 --enable-openssl --enable-nonfree   libavutil      56. 38.100 / 56. 36.101   libavcodec     58. 67.100 / 58. 64.101   libavformat    58. 37.100 / 58. 35.101   libavdevice    58.  9.103 / 58.  9.101   libavfilter     7. 72.100 /  7. 68.100   libswscale      5.  6.100 /  5.  6.100   libswresample   3.  6.100 /  3.  6.100   libpostproc    55.  6.100 / 55.  6.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20170614_0848_driving-Hwy395-CVL_rec12371.mov':   Metadata:     major_brand     : qt     minor_version   : 0     compatible_brands: qt     creation_time   : 2017-06-14T08:48:49.000000Z     original_format : DVR-CD     original_format-eng: DVR-CD     comment         : HDDVR-Mobius     comment-eng     : HDDVR-Mobius   Duration: 00:03:01.10, start: 0.000000, bitrate: 8523 kb/s     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 7868 kb/s, 30 fps, 30 tbr, 30k tbn, 60k tbc (default)     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : VideoHandler       encoder         : h264     Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 32000 Hz, 1 channels, s16, 512 kb/s (default)     Metadata:       creation_time   : 2017-06-14T08:48:49.000000Z       handler_name    : SoundHandler Also, trimming the input files to 3 minutes length each, does not crash concat. So something in the footer appears to be the cause. Are you going to want a sample of this video file? Stewart