Edit Question - KnowledgeHub

Title Body

I have an AVPlayer which is playing a HLS video stream. My user interface provides a row of buttons, one for each "chapter" in the video (the buttons are labeled "1", "2", "3"). The app downloads some meta-data from a server which contains the list of chapter cut-in points denoted in seconds. For example, one video is 12 minutes in length - the list of chapter cut-in points are 0, 58, 71, 230, 530, etc., etc. When the user taps one of the "chapter buttons" the button handler code does this: [self.avPlayer pause]; [self.avPlayer seekToTime: CMTimeMakeWithSeconds(seekTime, 600) toleranceBefore: kCMTimeZero toleranceAfter: kCMTimeZero completionHandler: ^(BOOL finished) { [self.avPlayer play]; }]; Where "seekTime" is a local var which contains the cut-in point (as described above). The problem is that the video does not always start at the correct point. Sometimes it does. But sometimes it is anywhere from a tenth of a second, to 2 seconds BEFORE the requested seekTime. It NEVER starts after the requested seekTime. Here are some stats on the video encoding: Encoder: handbrakeCLI Codec: h.264 Frame rate: 24 (actually, 23.976 - same as how it was shot) Video Bitrate: multiple bitrates (64/150/300/500/800/1200) Audio Bitrate: 128k Keyframes: 23.976 (1 per second) I am using the Apple mediafilesegmenter tool, of course, and the variantplaylistcreator to generate the playlist. The files are being served from an Amazon Cloud/S3 bucket. One area which I remain unclear about is CMTimeMakeWithSeconds - I have tried several variations based on different articles/docs I have read. For example, in the above excerpt I am using: CMTimeMakeWithSeconds(seekTime, 600) I have also tried: CMTimeMakeWithSeconds(seekTime, 1) I can't tell which is correct, tho

Tags (comma-separated) Cancel