. Thread 2 (process 27606): #0 0x00007f4b7ea58e5b in vfork () from /lib/libpthread.so.0 #1 0x0000000000000004 in ?? () #2 0x0000000000000004 in ?? () #3 0x00007fff875400e4 in ?? () #4 0x0000000000000004 in ?? () #5 0x0000000000000007 in ?? () #6 0x000000000057ed8f in ?? () #7 0x000000000057cdd2 in stream_write_buffer () #8 0x000000000048ea98 in ?? () #9 0x000000000048cdd3 in muxer_write_chunk () #10 0x0000000000488cac in ?? () #11 0x00000000004d05cc in ?? () #12 0x00000000004cbea5 in ?? () #13 0x00000000004a564c in filter_video () #14 0x000000000045b97e in main () . Thread 1 (process 5454): #0 0x00007f4b7ecadfb2 in x264_ratecontrol_mb (h=0x27e6f80, bits=) 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 = #2 0x00007f4b7ea523ba in start_thread () from /lib/libpthread.so.0 #3 0x00007f4b7a55106d in error_at_line () from /lib/libc.so.6 #4 0x0000000000000000 in ?? ()