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Is there any Video and Audio Calling API for free to handle large amount of user monthly and calling length is 10 minutes? [closed]

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I'm looking an API for video and audio calling which is free and it can handle huge amount of user.
I have try ZegoCloud, VideoSDk, Agora.io all are paid after a certain limit.

List with timeout/eviction in Java [closed]

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Is there a way in Java to create a List implementation that has a timeout/eviction policy for items contained in the list? Something along the lines of:
List<SomeObject> myList = new TimeoutList<>(10, TimeUnit.SECONDS);
so that items entered into the list will be automatically evicted after the given time. I know about the Guava Cache, but a cache is a Map and will not maintain the order of the items entered.

Update a data in SQL database [closed]

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I have a table in my database. I am using jdbc to use this database. I want to update a particular data by subtracting it to some value.
Suppose a student with name xyz is there. Currently his marks in a subject is 50. I want to delete it by 10, then what would be the syntax? I am new to SQL.

More or less:
update students
set mark = mark - 10
where name = 'xyz'
Can't give a better answer than that, as your question is very limited in useful and concrete information. I'm sure you'll figure it out.

KerberosKey in Swift [closed]

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There is a login api which authenticate user having userid & password as param , which is in java.I am supposed to send the param as a cipher text using des algorithm.The problem is on backend they are doing encryption using the KerberosKey generator
KerberosPrincipal KerPr = new KerberosPrincipal("****");
public KerberosKey(KerberosPrincipal principal,
char[] password,
String algorithm)
All the things provided by java "javax.security.auth.kerberos".How can I achieve the same in iOS.

Face reconization in android [closed]

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I want to compare the 2 images(images of people)and want a result that these are of same person or not(By Face recognization).I have to do this for millions of images so I cannot do it manually .Is there any api for android that can be used in my app.

You could use Camera.Face or FaceDetector.Face class. Take parameters of face on both photos and compare their parameters using e.g. eyesDistance(). If those parameters quite the same -> its the same person.