Uninstalled and reinstalled 4.7.4. Same issue. I may just need to reload my iMac (gah!)
Link to a 10 second sample. This plays a frozen frame for the first 5 seconds then plays very broken/distorted video:
https://www.dropbox.com/s/496cfr32g3kw2s...B.mp4?dl=0
Maybe there is something obvious in the log:
[2016-12-13 20:35:27] DEBUG: Launching mpeg converter: /usr/local/bin/ffmpeg
[2016-12-13 20:35:27] INFO: Deleted existing file.
[2016-12-13 20:35:27] DEBUG: Writing aspect ratio 3:2 to metadata of video file.
[2016-12-13 20:35:27] DEBUG: Launched encoder.
[2016-12-13 20:35:27] DEBUG: Speed 1.0
[2016-12-13 20:35:27] DEBUG: Quality 3
[2016-12-13 20:35:27] DEBUG: Frame rate 24
[2016-12-13 20:35:27] DEBUG: Output cs 420
[2016-12-13 20:35:27] DEBUG: Width 3840
[2016-12-13 20:35:27] DEBUG: Height 2560
[2016-12-13 20:35:28] DEBUG: ffmpeg version 3.1.4 Copyright © 2000-2016 the FFmpeg developers
[2016-12-13 20:35:28] DEBUG: built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
[2016-12-13 20:35:28] DEBUG: configuration: --prefix=/Volumes/tempdisk/sw --as=yasm --enable-gpl --enable-version3 --enable-pthreads --disable-ffplay --disable-ffserver --disable-shared --enable-static --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-avfilter --enable-fontconfig --enable-libfreetype --enable-libass --enable-libvidstab --enable-filters --enable-postproc --enable-runtime-cpudetect --disable-indev=qtkit --disable-indev=x11grab_xcb
[2016-12-13 20:35:28] DEBUG: libavutil 55. 28.100 / 55. 28.100
[2016-12-13 20:35:28] DEBUG: libavcodec 57. 48.101 / 57. 48.101
[2016-12-13 20:35:28] DEBUG: libavformat 57. 41.100 / 57. 41.100
[2016-12-13 20:35:28] DEBUG: libavdevice 57. 0.101 / 57. 0.101
[2016-12-13 20:35:28] DEBUG: libavfilter 6. 47.100 / 6. 47.100
[2016-12-13 20:35:28] DEBUG: libswscale 4. 1.100 / 4. 1.100
[2016-12-13 20:35:28] DEBUG: libswresample 2. 1.100 / 2. 1.100
[2016-12-13 20:35:28] DEBUG: libpostproc 54. 0.100 / 54. 0.100
[2016-12-13 20:35:28] DEBUG: Input #0, image2, from '/Users/blondienbaldie/Desktop/LRT_Castle_Point/LRT_%05d.jpg':
[2016-12-13 20:35:28] DEBUG: Duration: 00:00:09.60, start: 0.000000, bitrate: N/A
[2016-12-13 20:35:28] DEBUG: Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 4096x2731, 25 tbr, 25 tbn, 25 tbc
[2016-12-13 20:35:28] DEBUG: [swscaler @ 0x7ff69c000a00] deprecated pixel format used, make sure you did set range correctly
[2016-12-13 20:35:28] DEBUG: [swscaler @ 0x7ff69b8c8a00] deprecated pixel format used, make sure you did set range correctly
[2016-12-13 20:35:28] DEBUG: [libx264 @ 0x7ff69b001c00] using SAR=1/1
[2016-12-13 20:35:28] DEBUG: [libx264 @ 0x7ff69b001c00] frame MB size (240x160) > level limit (36864)
[2016-12-13 20:35:28] DEBUG: [libx264 @ 0x7ff69b001c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[2016-12-13 20:35:28] DEBUG: [libx264 @ 0x7ff69b001c00] profile High, level 5.2
[2016-12-13 20:35:28] DEBUG: [libx264 @ 0x7ff69b001c00] 264 - core 148 r2721 72d53ab - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 -
http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=10.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[2016-12-13 20:35:28] DEBUG: [mp4 @ 0x7ff69b000000] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[2016-12-13 20:35:28] DEBUG: [mp4 @ 0x7ff69b000000] Failed to parse creation_time "2016-12-13T20:35:27"
[2016-12-13 20:35:28] DEBUG: Output #0, mp4, to '/var/folders/rh/80ycksy56j7385pj592c38lw0000gn/T/LRT_Render_2720984428601571853.mp4':
[2016-12-13 20:35:28] DEBUG: Metadata:
[2016-12-13 20:35:28] DEBUG: creation_time : "2016-12-13T20:35:27"
[2016-12-13 20:35:28] DEBUG: encoder : Lavf57.41.100
[2016-12-13 20:35:28] DEBUG: Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc, bt2020c/bt2020/bt2020-10), 3840x2560 [SAR 1:1 DAR 3:2], q=-1--1, 24 fps, 12288 tbn, 24 tbc
[2016-12-13 20:35:28] DEBUG: Metadata:
[2016-12-13 20:35:28] DEBUG: encoder : Lavc57.48.101 libx264
[2016-12-13 20:35:28] DEBUG: Side data:
[2016-12-13 20:35:28] DEBUG: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[2016-12-13 20:35:28] DEBUG: Stream mapping:
[2016-12-13 20:35:28] DEBUG: Stream #0:0 (mjpeg) -> scale
[2016-12-13 20:35:28] DEBUG: unsharp -> Stream #0:0 (libx264)
[2016-12-13 20:35:28] DEBUG: Press [q] to stop, [?] for help
[2016-12-13 20:38:14] DEBUG: video:381691kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001205%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] frame I:1 Avg QP:11.40 size:3026130
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] frame P:61 Avg QP:10.72 size:2283051
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] frame B:180 Avg QP:12.89 size:1380879
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] consecutive B-frames: 0.8% 0.0% 0.0% 99.2%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] mb I I16..4: 6.3% 64.4% 29.3%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] mb P I16..4: 6.2% 38.5% 10.0% P16..4: 16.4% 16.6% 12.1% 0.0% 0.0% skip: 0.3%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] mb B I16..4: 3.3% 18.6% 5.1% B16..8: 20.5% 12.0% 9.0% direct:28.2% skip: 3.3% L0:34.1% L1:27.5% BI:38.4%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] 8x8 transform intra:69.5% inter:42.9%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] coded y,uvDC,uvAC intra: 98.9% 58.7% 56.0% inter: 89.6% 50.0% 21.9%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] i16 v,h,dc,p: 3% 5% 31% 60%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 7% 21% 41% 4% 5% 4% 7% 3% 8%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 23% 24% 6% 9% 5% 9% 4% 10%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] i8c dc,h,v,p: 58% 31% 8% 3%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] Weighted P-Frames: Y:4.9% UV:4.9%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] ref P L0: 40.1% 17.7% 27.9% 14.1% 0.2%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] ref B L0: 78.3% 15.2% 6.5%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] ref B L1: 93.9% 6.1%
[2016-12-13 20:38:14] DEBUG: [libx264 @ 0x7ff69b001c00] kb/s:310096.28
[2016-12-13 20:38:15] DEBUG: External encoder finished successfully.
[2016-12-13 20:38:17] INFO: Copied temporary file to render directory.
[2016-12-13 20:38:17] INFO: ...deleted temporary file.
[2016-12-13 20:38:17] INFO: Rendered video is located at: /Users/blondienbaldie/Desktop/Castle_Point_h264-420_4KUHD_24_VHQ+.mp4
[2016-12-13 20:38:17] DEBUG: Locating in Finder: /Users/blondienbaldie/Desktop/Castle_Point_h264-420_4KUHD_24_VHQ+.mp4