Undefined symbols for architecture x86_64:
"_ff_async_protocol", referenced from:
_qc_ijkav_register_async_protocol in TXLiteAVSDK_TRTC(ijkutils.o)
(maybe you meant: _qcloud_ijkimp_ff_async_protocol)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
报这个错,为什么,如何解决