[Mp4-tech] Parameters for Selection of reference frames in JM

[Tourapis, Alexis]

Unfortunately there is no such option in the JM. What you need to do, apart from setting the 2nd picture to be coded as Intra, is to introduce reordering commands in the software that will basically select for coding for an odd positioned picture only previously coded odd positioned pictures, and similarly for an even positioned picture select again previously coded even ones. You can see an example of reordering that is based on POC distances in function slice.c (poc_ref_pic_reorder). What you need to do is write a similar function that orders references not on poc distance but in this scenario on whether poc (or frame number to be coded) is odd or even followed then by poc distance.
I hope that helps.
Alexis
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Yiting LIAO
Sent: Wednesday, January 23, 2024 6:06 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Parameters for Selection of reference frames in JM
Hello All,
Is there a parameter that can be used to select reference frames used in the encoder. For example, odd frame only uses odd frames as reference frames and even frame only uses even frame as reference frames. If so, will the second frame in the video sequence be encoded into I-frame automatically? If not, which part should I modify to implement this function?
Thanks,
Yiting
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