[Libav-user] How to decode arbitrary frame

[James Board]

I have the doc/examples programs compiled and running.  I use 
the program demuxing.c to decode an AVI file.  From the source 
code, it looks it calls its own subroutine decode_packet() to decode
the next video or audio packet, and that subroutine calls
avcodec_ecode_video2()to decode the next frame.  But they all decode
sequential frames.  How can I decode an arbitrary frame in the
video stream?
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