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I have 2 .AVI files - one 625 MB (duration 1:02:45) and the other 925 MB (duration 1:32:12). I wish to combine the files into one .AVI file. In a command window I issue the command:

copy /b *.avi combined.avi

combined.avi results with a size of 1.51 GB (which is correct) but the duration is shown as 1:02:45 and, of course, when I try to play the combined.avi, it finishes at 1:02:45.

Can anyone explain why I am not receiving a correctly merged file?

G-Man Says 'Reinstate Monica'
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Paul Richards
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1 Answers1

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Devan mentioned in the comments above why you can't simply merge two AVIs using the copy command. However re-encoding shouldn't be required if both files match in terms of audio and video codecs used, resolution and so on.

Use AviDemux or VirtualDub to open the first AVI and then use File > Append for the second.

Ensure you have Copy selected for both Audio and Video in AviDemux's main window (along with AVI as the Format):

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Similarly if you're using VirtualDub ensure you have Direct Stream Copy selected under both the Audio and Video menus.

Karan
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