Segfault when using FFmbc for capturing X-windows desktop

[Patrick Dung]

I pull the source from git and compile in Fedora 25.

FFmbc version N-32102-ga863f7d

Running this command will lead to segfault:
ffmbc -f x11grab -s 1280x720 -r 25 -i :2.0+1,60 \
-f alsa -ac 2 -i pulse -acodec pcm_s16le -ar 44100 \
-vcodec prores -profile std -pix_fmt yuv422p10le \
-bufsize 16m \
/tmp/desktop-capture.mov

(gdb) bt
#0  0x00007fd025e31232 in free () from /lib64/libc.so.6
#1  0x000000000099cc55 in av_free (ptr=<optimized out>) at libavutil/mem.c:152
#2  0x000000000043f173 in transcode (output_files=0xd95b40 <output_files>, nb_stream_maps=<optimized out>, stream_maps=0x0,
    nb_input_files=2, input_files=0x1f8b980, nb_output_files=1) at ffmbc.c:3519
#3  main (argc=<optimized out>, argv=<optimized out>) at ffmbc.c:5514