softhddevice bt

(gdb) bt
#0  VideoGrab (size=0x7f9ea2ebce14, width=0x7f9ea2eba96c, height=
    0x7f9ea2eba968, write_header=<optimized out>) at video.c:8753
#1  0x00007f9ec79fa3bc in GrabImage (size=0x7f9ea2ebce14,
    jpeg=<optimized out>, quality=100, width=64, height=48) at softhddev.c:1202
warning: Range for type (null) has invalid bounds 0..-128
#2  0x00007f9ec9a2fa7a in cInputSoftdevice::CalcColors (this=0x7f9ea2ebce50)
    at inputsoftdevice.c:94
#3  0x00007f9ec9a2fbde in non-virtual thunk to cInputSoftdevice::Action() ()
    at inputsoftdevice.c:78
#4  0x000000000050234c in cThread::StartThread (Thread=0x11052e50)
    at thread.c:257
#5  0x00007f9ed9d36daa in start_thread () from /lib64/libpthread.so.0
#6  0x00007f9ed878b67d in clone () from /lib64/libc.so.6