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#define REGISTER_MUXER(X,x) { \
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extern AVOutputFormat x##_muxer; \
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#define REGISTER_DEMUXER(X,x) { \
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extern AVInputFormat x##_demuxer; \
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#define REGISTER_MUXDEMUX(X,x) REGISTER_MUXER(X,x); REGISTER_DEMUXER(X,x)
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void avdevice_register_all(void)