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AVAssetの任意の時間でトリムしてエクスポートする

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AVAssetExportSessionでエクスポートすると思うのですが、その際にtimeRangeを指定することで任意の時間でトリムすることができます。

        let videoDuration = CMTimeGetSeconds(videoAsset.duration)
        let stopTime = CMTimeMakeWithSeconds(videoDuration-0.1, 10)
        let range = CMTimeRangeFromTimeToTime(kCMTimeZero, stopTime)
        assetExport.timeRange = range

例えばこれは動画の長さの後ろ0.1秒を含まないようにしています。

CMTimeMakeWithSecondsを使うことで実際の秒数を意識してトリムすることができます。CMTimeより直感的ですね

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