[HELP] MKV (H.264/ACC) for Plex audio sync issues

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How did you append the files?
Did you make sure to create OpenDML avi files, otherwise anything beyond 2GB will make problems?

I tried two different ways with the same result. The first was using VirtualDub to append AVI segment and then just saved the AVI with direct stream copy for both audio and video. I did the same using AviDemux Append and direct copy to Avi Muxer selecting OpenDML.