Alternatively, install individual VFW codecs such as for H.264 support or ffdshow , ensuring the VFW interface is enabled in the configuration settings. Verify Configuration :
Navigate to Video -> Compression and ensure the desired codec is listed and selected. Unable To Initialize The Output Video Codec Virtualdub
If the source file is corrupted or in an unsupported format (like MKV or MP4), use tools like Handbrake or VLC Media Player to convert the file to a standard AVI format before importing it into VirtualDub. : Alternatively, install individual VFW codecs such as for H