Hi,
Today I tried to play an aac file, compressed long, long time ago with one of the first aac compressors. Unfortunately foo_mp4 gives me the following error:

I'am just wondering if there is a chance to play those files in the future using foo_mp4?

Your file probably has the old ADTS format. You can convert them to new format with some switch on FAAD2:

faad.exe -t -a output.aac input.aac

Menno

I've downloaded faad binaries from RareWares, but it seems don't have the following swithes "-t -a"?

Try searching for some newer binaries. For example on Case's site. You will find the address when doing a search on this forum. (Can't find it right now).

Menno

Unfortunately faad gives me the same error I suppose my old aac files are totally incompatible with the new aac compressors/decompressors.