Steganography is one of the techniques used for secure transmission of secret information. The secret information is concealed in a carrier and transmitted. Video steganography uses video signals to hide the secret information. The objective of this paper is to hide large volumes of secret data in video files. In the proposed technique, AVI video files are used as the carrier. Video files containing audio are split to get video and audio frames. Video frames are like still images and so, can be used for image steganography. When audio is extracted from the video, it is like an audio file and it can also be used for steganography. This leads to the high capacity steganography, since both video and audio frames are used as the carrier. When a small video clip is read, thousands of video and audio frames will also become available. The secret data can be image, audio or text. In this proposed work, secret image and audio signals are hidden in the video file.