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Get duration of video while it's being recorded with AVAssetWriter

I have a class to record video and audio into .mp4 file. I use AVAssetWriter, AVAssetWriterInput to do such task

How can I get duration of a video while it's being recorded with such method (AVAssetWriter)?

Solution

  • You can save start time when you begin startSession 

    let startTimeStamp = CMSampleBufferGetPresentationTimeStamp(sample)
fileWriter.startSession(atSourceTime: startTimeStamp)
startTime = Double(startTimeStamp.value) / Double(startTimeStamp.timescale)

    than every buffer you will get do this:

    let currentTimeStamp = CMSampleBufferGetPresentationTimeStamp(sample)
let currentTime = Double(currentTimeStamp.value) / Double(currentTimeStamp.timescale)

print("Duration - \(currentTime - startTime)")