Thanks for the response! The replay you had me test with shows up in the Mod, but when exported it doesn't show anything (pitch black). The resulting videos from my exports are here and here.
The method for retrieving my system information you linked isn't working. However, the launcher log output when I open Minecraft is this:
[13:52:44 INFO]: Minecraft Launcher 1.6.69 (through bootstrap 100) started on windows...
[13:52:44 INFO]: Current time is Nov 12, 2016 1:52:44 PM
[13:52:44 INFO]: System.getProperty('os.name') == 'Windows 10'
[13:52:44 INFO]: System.getProperty('os.version') == '10.0'
[13:52:44 INFO]: System.getProperty('os.arch') == 'amd64'
[13:52:44 INFO]: System.getProperty('java.version') == '1.8.0_25'
[13:52:44 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[13:52:44 INFO]: System.getProperty('sun.arch.data.model') == '64'
[13:52:44 INFO]: proxy == DIRECT
[13:52:44 INFO]: JFX is already initialized
[13:52:44 INFO]: Refreshing local version list...
[13:52:44 INFO]: Refreshing remote version list...
[13:52:45 INFO]: Refresh complete.
[13:52:45 INFO]: Loaded 2 profile(s); selected 'forge'
[13:52:45 INFO]: Refreshing auth...
[13:52:45 INFO]: Logging in with access token
ffmpeg version N-80123-gd74cc61 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 24.100 / 55. 24.100
libavcodec 57. 43.100 / 57. 43.100
libavformat 57. 37.101 / 57. 37.101
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 46.100 / 6. 46.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, rawvideo, from 'pipe:':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 4320x2160, 13436928 kb/s, 60 tbr, 60 tbn
[libx264 @ 0000000000d2a560] MB rate (2187000) > level limit (2073600)
[libx264 @ 0000000000d2a560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0000000000d2a560] profile Constrained Baseline, level 5.2
[libx264 @ 0000000000d2a560] 264 - core 148 r2694 3b70645 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=1 ip_ratio=1.40 aq=0
[mp4 @ 0000000000d28da0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Output #0, mp4, to '2016_11_12_12_27_58.mp4':
Metadata:
encoder : Lavf57.37.101
Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 4320x2160, q=2-31, 60 fps, 15360 tbn
Metadata:
encoder : Lavc57.43.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
frame= 5 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 7 fps=5.3 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 9 fps=4.8 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 11 fps=4.2 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 14 fps=4.2 q=1.0 size= 2777kB time=00:00:00.00 bitrate=350025846.2kbits/s speed=1.93e-005x
frame= 16 fps=4.1 q=1.0 size= 6980kB time=00:00:00.03 bitrate=1712054.9kbits/s speed=0.00856x
frame= 19 fps=4.0 q=1.0 size= 13392kB time=00:00:00.08 bitrate=1315430.0kbits/s speed=0.0174x
frame= 22 fps=4.0 q=1.0 size= 19857kB time=00:00:00.13 bitrate=1219422.7kbits/s speed=0.0243x
frame= 25 fps=4.1 q=1.0 size= 26322kB time=00:00:00.18 bitrate=1175744.9kbits/s speed=0.0297x
frame= 28 fps=4.1 q=1.0 size= 32755kB time=00:00:00.23 bitrate=1149665.5kbits/s speed=0.0338x
frame= 31 fps=4.0 q=1.0 size= 40458kB time=00:00:00.28 bitrate=1169482.9kbits/s speed=0.0366x
frame= 34 fps=4.0 q=1.0 size= 49250kB time=00:00:00.33 bitrate=1210127.6kbits/s speed=0.0394x
frame= 37 fps=4.0 q=1.0 size= 58026kB time=00:00:00.38 bitrate=1239823.9kbits/s speed=0.0418x
frame= 40 fps=4.1 q=1.0 size= 66775kB time=00:00:00.43 bitrate=1262172.8kbits/s speed=0.044x
frame= 42 fps=4.0 q=1.0 size= 72630kB time=00:00:00.46 bitrate=1274793.4kbits/s speed=0.0446x
frame= 44 fps=4.0 q=1.0 size= 78509kB time=00:00:00.50 bitrate=1286119.3kbits/s speed=0.0456x
frame= 47 fps=4.0 q=1.0 size= 87319kB time=00:00:00.55 bitrate=1300423.2kbits/s speed=0.0463x
frame= 49 fps=3.9 q=1.0 size= 93189kB time=00:00:00.58 bitrate=1308550.1kbits/s speed=0.0459x
frame= 51 fps=3.9 q=1.0 size= 99060kB time=00:00:00.61 bitrate=1315799.9kbits/s speed=0.0466x
frame= 53 fps=3.9 q=1.0 size= 104920kB time=00:00:00.65 bitrate=1322177.0kbits/s speed=0.0473x
frame= 55 fps=3.8 q=1.0 size= 110768kB time=00:00:00.68 bitrate=1327788.8kbits/s speed=0.0478x
frame= 58 fps=3.9 q=1.0 size= 119496kB time=00:00:00.73 bitrate=1334761.1kbits/s speed=0.0489x
frame= 61 fps=3.9 q=1.0 size= 128188kB time=00:00:00.78 bitrate=1340465.5kbits/s speed=0.0501x
frame= 63 fps=3.9 q=1.0 size= 134044kB time=00:00:00.81 bitrate=1344491.1kbits/s speed=0.0501x
frame= 65 fps=3.8 q=1.0 size= 139861kB time=00:00:00.85 bitrate=1347828.3kbits/s speed=0.0498x
frame= 68 fps=3.8 q=1.0 size= 148555kB time=00:00:00.90 bitrate=1352079.0kbits/s speed=0.0502x
frame= 71 fps=3.8 q=1.0 size= 157257kB time=00:00:00.95 bitrate=1355955.9kbits/s speed=0.0506x
frame= 73 fps=3.8 q=1.0 size= 163038kB time=00:00:00.98 bitrate=1358154.8kbits/s speed=0.0509x
frame= 75 fps=3.8 q=1.0 size= 168828kB time=00:00:01.01 bitrate=1360275.9kbits/s speed=0.0511x
frame= 77 fps=3.8 q=1.0 size= 174607kB time=00:00:01.05 bitrate=1362184.5kbits/s speed=0.0514x
frame= 80 fps=3.8 q=1.0 size= 183273kB time=00:00:01.10 bitrate=1364805.2kbits/s speed=0.052x
frame= 82 fps=3.8 q=1.0 size= 189042kB time=00:00:01.13 bitrate=1366362.5kbits/s speed=0.0519x
frame= 85 fps=3.8 q=1.0 size= 197749kB time=00:00:01.18 bitrate=1368905.5kbits/s speed=0.0526x
frame= 88 fps=3.8 q=1.0 size= 206440kB time=00:00:01.23 bitrate=1371135.8kbits/s speed=0.0532x
frame= 91 fps=3.8 q=1.0 size= 215153kB time=00:00:01.28 bitrate=1373332.6kbits/s speed=0.0536x
frame= 93 fps=3.8 q=1.0 size= 220961kB time=00:00:01.31 bitrate=1374703.2kbits/s speed=0.0536x
frame= 96 fps=3.8 q=1.0 size= 229637kB time=00:00:01.36 bitrate=1376414.5kbits/s speed=0.0541x
frame= 98 fps=3.8 q=1.0 size= 235412kB time=00:00:01.40 bitrate=1377434.4kbits/s speed=0.0542x
frame= 100 fps=3.7 q=1.0 size= 241172kB time=00:00:01.43 bitrate=1378317.5kbits/s speed=0.0537x
frame= 103 fps=3.8 q=1.0 size= 249793kB time=00:00:01.48 bitrate=1379469.5kbits/s speed=0.0542x
frame= 106 fps=3.8 q=1.0 size= 258392kB time=00:00:01.53 bitrate=1380428.8kbits/s speed=0.0546x
frame= 108 fps=3.8 q=1.0 size= 264157kB time=00:00:01.56 bitrate=1381203.9kbits/s speed=0.0547x
frame= 111 fps=3.8 q=1.0 size= 272780kB time=00:00:01.61 bitrate=1382179.7kbits/s speed=0.0552x
frame= 114 fps=3.8 q=1.0 size= 281401kB time=00:00:01.66 bitrate=1383088.9kbits/s speed=0.0555x
frame= 117 fps=3.8 q=1.0 size= 289994kB time=00:00:01.71 bitrate=1383810.5kbits/s speed=0.0559x
frame= 120 fps=3.8 q=1.0 size= 298593kB time=00:00:01.76 bitrate=1384518.4kbits/s speed=0.0563x
frame= 123 fps=3.8 q=1.0 size= 307176kB time=00:00:01.81 bitrate=1385114.9kbits/s speed=0.0566x
frame= 125 fps=3.8 q=1.0 size= 312903kB time=00:00:01.85 bitrate=1385520.7kbits/s speed=0.0567x
frame= 127 fps=3.8 q=1.0 size= 318638kB time=00:00:01.88 bitrate=1385944.2kbits/s speed=0.0567x
frame= 129 fps=3.8 q=1.0 size= 324350kB time=00:00:01.91 bitrate=1386252.9kbits/s speed=0.0567x
frame= 131 fps=3.8 q=1.0 size= 330068kB time=00:00:01.95 bitrate=1386577.3kbits/s speed=0.0566x
frame= 133 fps=3.8 q=1.0 size= 335784kB time=00:00:01.98 bitrate=1386882.6kbits/s speed=0.0565x
frame= 135 fps=3.8 q=1.0 size= 341499kB time=00:00:02.01 bitrate=1387176.3kbits/s speed=0.0562x
frame= 137 fps=3.7 q=1.0 size= 347223kB time=00:00:02.05 bitrate=1387493.6kbits/s speed=0.0559x
frame= 139 fps=3.7 q=1.0 size= 352923kB time=00:00:02.08 bitrate=1387706.7kbits/s speed=0.0558x
frame= 141 fps=3.7 q=1.0 size= 358619kB time=00:00:02.11 bitrate=1387898.7kbits/s speed=0.0558x
frame= 143 fps=3.7 q=1.0 size= 364323kB time=00:00:02.15 bitrate=1388114.3kbits/s speed=0.0559x
frame= 146 fps=3.7 q=1.0 size= 372848kB time=00:00:02.20 bitrate=1388310.3kbits/s speed=0.0563x
frame= 149 fps=3.8 q=1.0 size= 381353kB time=00:00:02.25 bitrate=1388425.5kbits/s speed=0.0567x
frame= 152 fps=3.8 q=1.0 size= 389833kB time=00:00:02.30 bitrate=1388444.7kbits/s speed=0.0572x
frame= 153 fps=3.8 q=-1.0 Lsize= 429003kB time=00:00:02.53 bitrate=1387224.7kbits/s speed=0.0622x
video:429001kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000464%
[libx264 @ 0000000000d2a560] frame I:1 Avg QP: 0.00 size:2843352
[libx264 @ 0000000000d2a560] frame P:152 Avg QP: 1.00 size:2871402
[libx264 @ 0000000000d2a560] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0000000000d2a560] mb P I16..4: 8.8% 0.0% 0.0% P16..4: 54.6% 0.0% 0.0% 0.0% 0.0% skip:36.7%
[libx264 @ 0000000000d2a560] coded y,uvDC,uvAC intra: 65.6% 72.6% 72.5% inter: 48.5% 51.1% 51.1%
[libx264 @ 0000000000d2a560] i16 v,h,dc,p: 26% 60% 12% 2%
[libx264 @ 0000000000d2a560] i8c dc,h,v,p: 28% 65% 4% 3%
[libx264 @ 0000000000d2a560] kb/s:1378184.88
I've also discovered another problem where it isn't saving my keyframes. Should I just re-record everything and call it a day? Or is this salvageable?