#0  0x00007f4b7ecadfb2 in x264_ratecontrol_mb (h=0x27e6f80, 
    bits=<value optimized out>) at encoder/ratecontrol.c:897
	rc = (x264_ratecontrol_t *) 0x294b270
	y = 0
#1  0x00007f4b7ecc1800 in x264_slices_write (h=0x27e6f80)
    at encoder/encoder.c:1150
	i_frame_size = <value optimized out>
#2  0x00007f4b7ea523ba in start_thread () from /lib/libpthread.so.0
#3  0x00007f4b7a55106d in error_at_line () from /lib/libc.so.6
#4  0x0000000000000000 in ?? ()