Movie fails to encode using Chimerax: dyld: Symbol not found: _clock_gettime

[vs4p@…]

I have been trying to record a movie using ChimeraX, but I keep getting an
error message whenever I try to encode the movie.  This is the message:

Error during MPEG encoding:
-----------------------------
Exit value: -5
Error message:
stdout:

stderr:
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/private/var/tmp/chimerax_build/v0.9/chimerax/build
--enable-gpl --enable-version3 --disable-network --disable-doc
--disable-devices --disable-ffplay --disable-ffserver --disable-ffprobe
--enable-libtheora --enable-libvpx --enable-libx264
--yasmexe=/private/var/tmp/chimerax_build/v0.9/chimerax/build/bin/yasm
--optflags=-O
--extra-cflags=-I/private/var/tmp/chimerax_build/v0.9/chimerax/build/include
--extra-ldflags='-O3 -Wall -Wextra
-L/private/var/tmp/chimerax_build/v0.9/chimerax/build/lib' --extra-libs=-ldl
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
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, image2, from
'/var/folders/wm/w365_fnx5595zyhxm7yz04mw0000gp/T/chimovie_pppp-%05d.ppm':
Duration: 00:00:14.40, start: 0.000000, bitrate: N/A
Stream #0:0: Video: ppm, rgb24, 1139x722, 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0x7ff75a005800] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
[libx264 @ 0x7ff75a005800] profile High, level 3.1
[libx264 @ 0x7ff75a005800] 264 - core 148 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2017 - 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=12 lookahead_threads=2
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=25 scenecut=40
intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=20.0 qcomp=0.60 qpmin=0
qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/Users/vsantosh/Desktop/blahblah.mp4':
Metadata:
encoder : Lavf57.56.101
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p,
1138x722, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc57.64.101 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
Stream #0:0 -> #0:0 (ppm (native) -> h264 (libx264))
Press [q] to stop, [?] for help
dyld: lazy symbol binding failed: Symbol not found: _clock_gettime
Referenced from:
/Volumes/ChimeraXInstaller/ChimeraX-0.9.app/Contents/bin/ffmpeg
Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: _clock_gettime
Referenced from:
/Volumes/ChimeraXInstaller/ChimeraX-0.9.app/Contents/bin/ffmpeg
Expected in: /usr/lib/libSystem.B.dylib

I hope you can help.
-- 
Vishaka Santosh
UVA Class of 2011, BS in Chemistry with a specialization in Biochemistry
VCU Class of 2013, MS in Biochemistry
VCU Class of 2018, PhD in Physiology and Biophysics

[pett]

Reported by Vishaka Santosh

[Tom Goddard]

Duplicate of #1379.

We have only seen this error on old macOS versions 10.11 or earlier. As it says on the download page we only support macOS 10.12 and newer. Current macOS is 10.14.