The DSC-TX30 supports a maximum video resolution of 1920 x 1080 pixels. That's over two times the video resolution of a 1280 x 720 pixels digital camera, which is the most frequently found video resolution supported by waterproof cameras that were released around the same time as the DSC-TX30. In addition, this Sony camera support a video resolution of 640 x 480 pixels and 1440 x 1080 pixels. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
This digital camera's video resolution (1920 x 1080 pixels) is actually the best supported video resolution across all similar spec digital cameras that are a comparable age to the DSC-TX30.
A 320 x 240 pixels video resolution is the worst supported video resolution across similar types of digital camera.