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I have a problem with a video which has an audio stream longer than the video stream according to ffmpeg command line : 

ffmpeg -i input.mp4 -vcodec copy -an -f null - <--- video stream duration ffmpeg -i input.mp4 -acodec copy -an -f null - <--- audio stream duration

For example, the the first command gives a list of data including the stream duration of 3.64 and the second 3.80.

I need to retrieve the video stream duration on Swift. I tried this :

guard let videoAssetTrack = asset.tracks(withMediaType: AVMediaType.video).first else { return } let duration: CMTime = videoAssetTrack.timeRange.duration let durationTime = CMTimeGetSeconds(duration)

It gives me 3.80, not the value I was expecting.

Thank you for your attention, I hope you can help me on this case.

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  • Who don't you use ffprobe to get the duration? Commented Mar 14, 2019 at 17:17
  • Thank you @llogan, this is a nice ffmpeg command. What is the best way to execute this command on Swift ? I read about adding a wrapper or doing something like this. Commented Mar 15, 2019 at 9:13
  • Sorry, but I don't know. I've never used Swift. Commented Mar 15, 2019 at 17:22
  • Well, think of it like this - the combined overall time length would be the maximum time (I assume) of any asset, i.e. the 3.8. I've never dealt with a stream/video that had different video and audio lengths; tbh, I find that quite odd haha Commented Aug 3, 2019 at 15:03
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