[Mp4-tech][H.264][JM] Understanding JM concealment

[Mario Tilli]

Hi everyone
I'm getting some problems with JM 11.0 decoder...
In decoder.cfg I've selected Motion Copy as concealment mode..but after decoding I don't see any concealment at all.
I've found in erc_do_p.c this function
void conceal_non_ref_pics(int diff)
and this test, in particular, that enable any concealment:
if((pocs_in_dpb[i+1]-pocs_in_dpb[i])> img->poc_gap)
I don't understand how can I use these concealments, or when one of them starts...
If anyone can help me.. I'll appreciate.
Mario
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