H264 Multi Reference frames

[vizzimani]

Hi everybody
I am trying to implement multi frame reference feature in h264 decoder. can any one tell me what is meant by sliding window operation (first-in first-out). and what syntax elements i required to do that sliding window operation.

thanks in advance
vizzimani

[aphon]

hi, if your num_ref_frame=3 and encode 4 frames : IPPP (nal_ref_idc !=0 of each picture), when the last p picture is encoded/decoded, dpb's num_ref_frames is full, dpb should release the first I picture as non reference frame (first in first out) and let the last p picture as reference frame into dpb, that is what sliding window operation works.

[vizzimani]

thnak u aphon
now i am able to sliding window for frames. but same logic first in first out is not working with fields. why? help me.
thanks in advance
Mani