cmtime

Im having a problem with seeking with AVPlayer.seekToTime, I have the time index that I want to seek to inside a scrollViewDidScroll method like this: func scrollViewDidScroll(scrollView: UIScrollView) { let offsetTime = scrollView.contentOffset.y * 0.1 self.playerController.player?.seekToTime(CMTime(seconds: Double(offsetTime), preferredTimescale: 10), toleranceBefore: kCMTimePositiveInfinity, toleranceAfter: kCMTimeZero) } But the video does not flow nice. For example, when you scroll I want the video to only to move forward like 0.01 of a second (the video I have is real short only about 2

I'm attempting to play a video with AVFoundation. I am using the following code for a button that advances the playback by one frame. It works intermittently, on some executions it will do the right thing and advance one frame, but most times I will have to press the button 3 or 4 times before it will advance a frame. This makes me think it is some kind of precision issue, but I can't figure out what it is. Each time it is run the new CMTime appears to be advancing by the same amount. My other theory is that it could be caused by the currentTime not being set to an exact frame boundary at my

I'm writing some frames to video with AVAssetWriterInputPixelBufferAdaptor , and the behavior w.r.t. time isn't what I'd expect. If I write just one frame: [videoWriter startSessionAtSourceTime:kCMTimeZero]; [adaptor appendPixelBuffer:pxBuffer withPresentationTime:kCMTimeZero]; this gets me a video of length zero, which is what I expect. But if I go on to add a second frame: // 3000/600 = 5 sec, right? CMTime nextFrame = CMTimeMake(3000, 600); [adaptor appendPixelBuffer:pxBuffer withPresentationTime:nextFrame]; I get ten seconds of video, where I'm expecting five. What's going on here? Does

I have a small integer value and I want to convert it into CMTime. The problem is that CMTime(value: _ , timeScale: _) or CMTimeMakeWithSeconds(value: _ , timeScale: _) will always return the floor so that time always equals 0.0 seconds let smallValue = 0.0401588716 let frameTime = CMTime(Int64(smallValue) , timeScale: 1) //frameTime is 0.0 seconds because of Int64 conversion let frameTimeInSeconds = CMTimeMakeWithSeconds(smallValue , timeScale: 1) // frameTimeInSeconds also returns 0.0 seconds. CMTime represents a time value as a rational number with integer numerator (the value ) and