Encoding JPEG, QP value > = 52, core dump exception #282
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PR描述:
encode_app jpeg编码，当设置qp值大于等于52时，崩溃。
详细描述:
bug原因：jpeg编码时SliceQP不能大于maxqp，否则编码底层库报错。
解决办法:jpeg编码为constqp，设置maxqp与sliceqp相同。
关联issue:
fix #281