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I have a sample buffer that I'm using to capture video for an AVAssetWriter. I'm trying to figure out a way to determine how much video (time) I have captured. currently I am able to access the current buffer timestamp by using 

CMTime pts = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);

I'm looking for a way to determine the duration of the buffer, i've tried

CMTime dur = CMSampleBufferGetOutputDuration(sampleBuffer); but it seems to fluctuate

between .002333 and nan for some reason

user379468
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1 Answers1

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Why not just keep a timestamp for the first sample, and do a very simple calculation (latest timestamp minus the first one)?

Grassright
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