Got " Failed to get producer codec" error when use imsdroid lib to create video call

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http://stackoverflow.com – Recently I am writing an android sip client using imsdroid library. The voice call is OK, but when I want to make an video call, I got E/org.doubango.ngn.sip.NgnAVSession(19728): Failed to get producer codec I have checked my code with imsdroid. but nothing wrong found. Can anyone help me to check this error? thanks in advance. (HowTos)