I converted 2 .avis into H264 .mp4s using ffmpegx, and now I need to join them. Usually I just opy/paste in QuickTime and export using the passthrough setting. However, everytime I try to join this, and as it happens another similar 2 files I'm working with right now, the export fails about 2/3 the way through with the words "Export failed. <11>" Anyone know what an error 11 is? Anyone know how I can fix this, or how I can join these files in a different way, perhaps with ffmpegx?