avformat/4xm: Check for duplicate track ids
Signed-off-by:Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit dd949124) Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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Signed-off-by:Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit dd949124) Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>