You seem to only have a DirectShow filter installed for the respective codec, but VirtualDub needs a vfw (video) or acm (audio) codec. This is another facet of the acm/vfw/dshow trouble. I tried to opened a avi file but I get a "Couldn't locate decompressor for format 'XXXX' (unknown)" error, although it plays fine with my movie player. The mpeg2 mod by fccHandler can handle (no pun intended ) ac3 sound, but only if the source is a mpeg2 file. To my knowledge there is neither a ac3 nor a dts acm codec (all are direct show and not usable by vdub). VirtualDub is entirely vfw (Video for Windows) based, so it needs vfw compatible codecs for video and acm (Audio Compression Manager) compatible codecs for sound. I opened a avi file with ac3/dts sound and can't play it in virtualdub or convert the sound, why not? See previous question for possible solutions. The mpeg file most likely actually is a mpeg2 file which can't be opened by VirtualDub. When I open a mpeg file I get a 'pack synchronization error', what does that mean? Other possibilites are to use VirtualDubMod or fccHandlers MPEG2 mod. But if you don't want to learn a simple scripting language, do a search for AVSGen and download it, and that will create a script for you. MPEG2 can be framserved instead to VirtualDub, using an avs script see for more info. MPEG2 is not supported nativly in VirtualDub and it never will be according to the author, Avery Lee because of liscensing issues however, MPEG1 is supported. The official VirtualDub site is NOT See for more info about How do I get MPEG2 support in VirtualDub? Where is the official VirtualDub website? Here is a quick VirtualDub FAQ because I'm getting fed up of people who can't be assed to search the forums.
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