Put together our hyperlapse puzzle videos…

  • First stab at a merge using ffmpeg
time ffmpeg -safe 0 -f concat -i infiles.txt -vcodec copy -acodec copy merged.MOV

file ./2019-03-09\ 23.03.34.mov
file ./2019-03-10\ 01.21.50.mov
file ./2019-03-10\ 13.01.46.mov
file ./2019-03-10\ 13.03.59.mov
file ./2019-03-10\ 13.05.02.mov
file ./2019-03-10\ 18.43.53.mov

Did it do the right thing?

  • What are my mov lengths..
$ cat fileslist.txt |xargs -t -I % sh -c 'ffmpeg -i "%"  2>&1 |grep Duration '
sh -c ffmpeg -i "./2019-03-09 23.03.34.mov"  2>&1 |grep Duration 
  Duration: 00:00:30.40, start: 0.000000, bitrate: 14837 kb/s
sh -c ffmpeg -i "./2019-03-10 01.21.50.mov"  2>&1 |grep Duration 
  Duration: 00:00:34.50, start: 0.000000, bitrate: 14971 kb/s
sh -c ffmpeg -i "./2019-03-10 13.01.46.mov"  2>&1 |grep Duration 
  Duration: 00:00:00.07, start: 0.000000, bitrate: 15840 kb/s
sh -c ffmpeg -i "./2019-03-10 13.03.59.mov"  2>&1 |grep Duration 
  Duration: 00:00:01.40, start: 0.000000, bitrate: 16455 kb/s
sh -c ffmpeg -i "./2019-03-10 13.05.02.mov"  2>&1 |grep Duration 
  Duration: 00:00:32.63, start: 0.000000, bitrate: 14944 kb/s
sh -c ffmpeg -i "./2019-03-10 18.43.53.mov"  2>&1 |grep Duration 
  Duration: 00:00:39.10, start: 0.000000, bitrate: 14868 kb/s
  • And the length of the merged movie created …
$ ffmpeg -i merged.MOV 2>&1|grep Duration
  Duration: 00:02:18.10, start: 0.000000, bitrate: 14921 kb/s
  • Doing some quick mental maths, that actually roughly adds up.

Grr but at minute 1:05 it flips the video

  • What the heck? Ah according to stackoverflow , ffmpeg uses rotation metadata to autorotate. Except heh in this case perhaps the autorotate did not happen when I was concatenating?
  • My file 2019-03-10 13.05.02.mov appears to be the one which was rotated.
  • Trying to process it to see what happens…
ffmpeg -i 2019-03-10\ 13.05.02.mov -c:a copy 2019-03-10\ 13.05.02.ROTATED.mov
  • Wow that took at least a minute. So umm, since the initial concatenation took under a second, I seriously doubt the autorotation was done during the concatenation.
  • Okay, lets try that concat one more time, this time with the new file… and new files list
file ./2019-03-09\ 23.03.34.mov
file ./2019-03-10\ 01.21.50.mov
file ./2019-03-10\ 13.01.46.mov
file ./2019-03-10\ 13.03.59.mov
file ./2019-03-10\ 13.05.02.mov
file ./2019-03-10\ 18.43.53.mov

time ffmpeg -safe 0 -f concat -i infiles.2019-03-16T2004Z.txt -vcodec copy -acodec copy 2019-03-16T2006Z-puzzle-merged.MOV
  • Unfortunately, 2019-03-16T2006Z-puzzle-merged.MOV is even worse, because for some reason, only one frame is displayed for several minutes. So some more tweaking is needed.

Appendix

full output of the merge command

ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, concat, from 'infiles.txt':
  Duration: N/A, start: 0.000000, bitrate: 14833 kb/s
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc), 1920x1080, 14833 kb/s, 30 fps, 30 tbr, 600 tbn, 600 tbc
    Metadata:
      rotate          : 180
      creation_time   : 2019-03-10T05:20:20.000000Z
      handler_name    : Core Media Video
      encoder         : HEVC
Output #0, mov, to 'merged.MOV':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc), 1920x1080, q=2-31, 14833 kb/s, 30 fps, 30 tbr, 19200 tbn, 600 tbc
    Metadata:
      rotate          : 180
      creation_time   : 2019-03-10T05:20:20.000000Z
      handler_name    : Core Media Video
      encoder         : HEVC
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mov @ 0x7fba5d80dc00] Non-monotonous DTS in output stream 0:0; previous: 1246080, current: 1246080; changing to 1246081. This may result in incorrect timestamps in the output file.
frame= 2828 fps=0.0 q=-1.0 size=  172544kB time=00:01:34.20 bitrate=15005.1kbitsframe= 4142 fps=0.0 q=-1.0 Lsize=  251538kB time=00:02:18.00 bitrate=14931.9kbits/s speed= 148x    
video:251484kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.021355%

real	0m1.186s
user	0m0.124s
sys	0m0.232s

reference