Vivotek CC9380-HV User Manual page 341

minsft <positive
integer>
Return Code
400 Bad Request
415 Unsupported Media Type
0 How many seconds of cached stream client can accept at
least.
(Used by forcechk)
Description
Request is rejected because some parameter values are illegal.
Returned, if forcechk appears,when minsft is not achievable or the
timeshift feature of the target stream is not enabled.
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User's Manual - 341