avformat/mux: factorize header writing code
Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NMarton Balint <cus@passwd.hu>
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Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NMarton Balint <cus@passwd.hu>