[FFmpeg-user] Command being killed in perceptual hashing / ffmpeg in general

[Aoife Fitzmaurice]

>Generally, a backtrace, disassembly and register dump are required for crash reports (esp. if they are not easily reproducible).

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Hi Carl, 

Thanks for your response! I changed the dimensions to 320x240 and it worked as expected.  It may just be that the files are too large. 

I was following the ffmpeg bug report documentation (https://www.ffmpeg.org/bugreports.html) to try and get any additional information on why the process crashed with the original file, but that process didn't work either.  

Input: ifi-mac-pro:~ admin$ gdb ffmpeg
Output: GNU gdb (GDB) 8.0.1
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin15.6.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ffmpeg...(no debugging symbols found)...done.

Input: (gdb) r ffmpeg -i Card\ 1/B0011888U01.mov  -i / Card\ 2/B0011888.mov   -filter_complex signature=detectmode=full:nb_inputs=2 -f null -loglevel verbose -
Output: Starting program: /usr/local/bin/ffmpeg ffmpeg -i Card\ 1/B0011888U01.mov  -i  Card\ 2/B0011888.mov   -filter_complex signature=detectmode=full:nb_inputs=2 -f null -loglevel verbose -
Unable to find Mach task port for process-id 63368: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))
(gdb)

I looked (codesigned - see taskgated(8)) and it looks like it needs to circumvent some security certificate, which I wouldn't be confident doing on this workstation. Would there be another way to get the backtrace, disassembly and register dump for any issues in the future? 

Thanks, 

Aoife