[Mp4-tech] About IDR frame used as long term reference frame

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Dear List members,
I am using JM12.2 encoder.cfg encoder. I wanted to make IDR frame be used as a long term reference frame. I have known that the syntax "long_term_reference_flag" in slice header denotes whether IDR frame is used as a long term reference frame after being decoded, but I haven't known how this syntax can equal to 1 during the encoding process. Can anybody help me in this regrad?
Best regards,
Xiaomin Chen
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