Using ffmpeg to Merge Videos
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 full output here and used this infiles.txt , following the directions 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 xargs reference