Hitchcock's Blackmail (1929).

Hitchcock makes a
cameo appearance in
Blackmail (1929)

BFI Screenonline looks at Alfred Hitchcock's Blackmail (1929), Britain's first full-length sound film. Although the video clips posted cannot be seen outside the United Kingdom, production stills can be viewed (but a sound test for Blackmail with Hitchcock and leading lady Anny Ondra can be seen here).