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copied!<p>This is untested, but I believe it should get you on the right track:</p> <pre><code>[DllImport(Constants.CoreMediaLibrary)] int CMSampleBufferGetSampleTimingInfoArray ( IntPtr sbuf, int timingArrayEntries, CMSampleTimingInfo [] timingArrayOut, out int timingArrayEntriesNeededOut ); [DllImport(Constants.CoreMediaLibrary)] int CMSampleBufferCreateCopyWithNewTiming ( IntPtr allocator, IntPtr originalSBuf, int numSampleTimingEntries, CMSampleTimingInfo []sampleTimingArray, out IntPtr sBufCopyOut ); CMSampleBuffer AdjustTime (CMSampleBuffer sample, CMTime offset) { int count; CMSampleBufferGetSampleTimingInfoArray (sample.Handle, 0, null, out count); CMSampleTimingInfo [] pInfo = new CMSampleTimingInfo [count]; CMSampleBufferGetSampleTimingInfoArray (sample.Handle, count, pInfo, out count); for (int i = 0; i < count; i++) { pInfo [i].DecodeTimeStamp = CMTime.Subtract (pInfo [i].DecodeTimeStamp, offset); pInfo [i].PresentationTimeStamp = CMTime.Subtract (pInfo [i].PresentationTimeStamp, offset); } IntPtr sout; CMSampleBufferCreateCopyWithTiming (IntPtr.Zero, sample, count, pInfo, out sout); // Unfortunately the constructor we need is internal, but that can be fixed // for a future version of Xamarin.iOS. return (CMSampleBuffer) typeof (CMSampleBuffer).GetConstructor (BindingFlags.Instance | BindingFlags.NonPublic, null, new Type [] { typeof (IntPtr), typeof (bool) }, null).Invoke (new object [] { sout, true }); } </code></pre> <p><strong>Update</strong></p> <p>I have implemented some of the required API in Xamarin.iOS now, so in future versions you'll be able to do this:</p> <pre><code>CMSampleBuffer AdjustTime (CMSampleBuffer sample, CMTime offset) { var info = sample.GetSampleTimingInfo (); for (int i = 0; i < info.Length; i++) { info [i].DecodeTimeStamp = CMTime.Subtract (info [i].DecodeTimeStamp, offset); info [i].PresentationTimeStamp = CMTime.Subtract (info [i].PresentationTimeStamp, offset); } return CMSampleBuffer.CreateWithNewTiming (sample, info) } </code></pre>

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