valgrind ./doc/examples/scaling_video_g
==700== Memcheck, a memory error detector
==700== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==700== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info
==700== Command: ./doc/examples/scaling_video_g
==700== 
==700== 
==700== Process terminating with default action of signal 11 (SIGSEGV)
==700==  General Protection Fault
==700==    at 0x17EDE2: ??? (in /home/tmtu/Downloads/FFmpeg-n4.3.1/doc/examples/scaling_video_g)
==700==    by 0x4BF4EFF: ???
==700==    by 0x4C03EFF: ???
==700== 
==700== HEAP SUMMARY:
==700==     in use at exit: 1,127,619 bytes in 17 blocks
==700==   total heap usage: 29 allocs, 12 frees, 1,209,859 bytes allocated
==700== 
==700== LEAK SUMMARY:
==700==    definitely lost: 0 bytes in 0 blocks
==700==    indirectly lost: 0 bytes in 0 blocks
==700==      possibly lost: 0 bytes in 0 blocks
==700==    still reachable: 1,127,619 bytes in 17 blocks
==700==         suppressed: 0 bytes in 0 blocks
==700== Rerun with --leak-check=full to see details of leaked memory
==700== 
==700== For lists of detected and suppressed errors, rerun with: -s
==700== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)