swift and CMTimeMake

Question

I try to capture video:
https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html#//apple_ref/doc/uid/TP40010188-CH5-SW26

var maxDuration : CMTime = CMTimeMake(seconds, preferredTimeScale)
aMovieFileOutput.maxRecordedDuration = CMTimeMake(seconds, preferredTimeScale)

1 row have error: Use of module 'CMTime' as a type
2 row have error: Use of unresolved identifier 'CMTimeMake'

What I do wrong?

Thiosinamine

Answer 1

CMTime and CMTimeMake are defined in the "CoreMedia" module, therefore you have to

import CoreMedia

Then this compiles without problems:

let seconds : Int64 = 10
let preferredTimeScale : Int32 = 1
let aMovieFileOutput = AVCaptureMovieFileOutput()
let maxDuration : CMTime = CMTimeMake(seconds, preferredTimeScale)
aMovieFileOutput.maxRecordedDuration = maxDuration

Update for Swift 3:

let maxDuration = CMTime(seconds: Double(seconds), preferredTimescale: 1)

Jacqulynjactation

if CMTimeMake also receives seconds what is the difference with CMTimeMakeWithSeconds? and if preferredTimeScale is just the denominator in CMTimeMake it is not clear what is its purpose in CMTimeMakeWithSeconds – Dermis

@dashesy: CMTimeMake(value, timescale) returns a CMTime with the given value and timescale, representing seconds = value/timescale (compare for example https://mcmap.net/q/145285/-trying-to-understand-cmtime). CMTimeMakeWithSeconds(seconds, preferredTimeScale) returns a CMTime where value and timescale are chosen such that seconds=value/timescale, and timescale is preferredTimeScale (or a fraction thereof in the case of an overflow). As an example CMTimeMake(2, 10) and CMTimeMakeWithSeconds(0.2, 10) give the same result. – Jacqulynjactation