1. Internet video sub-titling cases Henning Schulzrinne henning.schulzrinne@fcc.gov

2. Case 1: file formats store audio, video can be downloaded or streamed

3. Case 2: proprietary system Internet proprietary content format custom player (only plays one content provider) content only works with that player

4. Case 3: separated systems, proprietary Internet content company X web site Y proprietary protocol (may be public or secret)

5. Case 4: standards-based systems Internet content company X web site Y standard protocol (e.g., RTSP + RTP)