Alexei Svitkine <[email protected]> added the comment:

For the record, to detect this in the code, you can add the constants:

#define SMACKER_FLAG_Y_INTLERACED 0x02
#define SMACKER_FLAG_Y_DOUBLED    0x04

to libavformat/smacker.c

And test for these in the same way the code already tests for the 
SMACKER_FLAG_RING_FRAME flag (the flags are on the same field in the 
header).

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