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I am trying to capture the video feed off of my Nikon D500 DSLR camera that is connected to an USB capture card. The captured video lags so much against the audio (from an audio recording device separate from the camera). Adjusting the audio latency does not help much. Could this problem be caused by the performance of the capture card, or is it a performance issue of v4l2? Thanks.

I am using AMD version of clang to build nco, and I am stuck with following error. ... ... ... mv -f .deps/fmc_cls.Tpo .deps/fmc_cls.Po mv -f .deps/prs_cls.Tpo .deps/prs_cls.Po mv -f .deps/NcapVarVector.Tpo .deps/NcapVarVector.Po mv -f .deps/ncap2_att.Tpo .deps/ncap2_att.Po mv -f .deps/Invoke.Tpo .deps/Invoke.Po mv -f .deps/ncap2.Tpo .deps/ncap2.Po mv -f .deps/ncoParser.Tpo .deps/ncoParser.Po mv -f .deps/ncoLexer.Tpo .deps/ncoLexer.Po fmc_all_cls.cc: In member function ‘virtual var_sct* print_cls::fnd(antlr::RefAST,...

I am using AMD version of clang to build nco, and I am stuck with following error. mv -f .deps/fmc_cls.Tpo .deps/fmc_cls.Po mv -f .deps/prs_cls.Tpo .deps/prs_cls.Po mv -f .deps/NcapVarVector.Tpo .deps/NcapVarVector.Po mv -f .deps/ncap2_att.Tpo .deps/ncap2_att.Po mv -f .deps/Invoke.Tpo .deps/Invoke.Po mv -f .deps/ncap2.Tpo .deps/ncap2.Po mv -f .deps/ncoParser.Tpo .deps/ncoParser.Po mv -f .deps/ncoLexer.Tpo .deps/ncoLexer.Po fmc_all_cls.cc: In member function ‘virtual var_sct* print_cls::fnd(antlr::RefAST,...

I am using AMD version of clang to build nco, and I am stuck with following error. mv -f .deps/fmc_cls.Tpo .deps/fmc_cls.Po mv -f .deps/prs_cls.Tpo .deps/prs_cls.Po mv -f .deps/NcapVarVector.Tpo .deps/NcapVarVector.Po mv -f .deps/ncap2_att.Tpo .deps/ncap2_att.Po mv -f .deps/Invoke.Tpo .deps/Invoke.Po mv -f .deps/ncap2.Tpo .deps/ncap2.Po mv -f .deps/ncoParser.Tpo .deps/ncoParser.Po mv -f .deps/ncoLexer.Tpo .deps/ncoLexer.Po fmc_all_cls.cc: In member function ‘virtual var_sct* print_cls::fnd(antlr::RefAST,...