Unveiling the Crucial Papers Influencing the Evolution of Audio-Video over Internet Protocol (AV-over-IP) - IPMX Revealed

Unveiling the Crucial Papers Influencing the Evolution of Audio-Video over Internet Protocol (AV-over-IP) - IPMX Revealed

The IPMX framework, rooted in the Video Services Forum (VSF) TR-10 and Advanced Media Workflow Association (AMWA) NMOS specifications, is set to redefine how Audio-Visual (AV) over Internet Protocol (IP) solutions are implemented. This groundbreaking project, the first of its kind, involves upgrading and expanding an existing AV system, integrating legacy baseband equipment with new IPMX endpoints.

The project, spanning huddle rooms, digital signage, and an auditorium equipped for live productions, has encountered several challenges along the way. One such issue was an EDID-related problem with the digital signage system, where older monitors reported 4K30, falling short of the project's 4K60 specification. A potential solution to this resolution issue is adding a gateway from an unfamiliar manufacturer that is capable of frame rate conversion, enabled by NMOS IS-12.

In the huddle rooms, a requirement for encrypted content traffic led to the introduction of the Privacy Encryption Protocol (PEP), outlined in TR-10-13. The 'secure' huddle room, in particular, demands all content traffic to be encrypted.

Another challenge was maintaining synchronisation between audio and video. This led to an investigation of High-bandwidth Digital Content Protection (HDCP) and the content mixer. However, an IPMX solution capable of handling content mixing while adhering to HDCP through HKEP (IPMX's DCP-approved protocol for handling HDCP-compliant key exchange defined in TR-10-5) was employed.

The customer also requested that company announcements be shown in an "L-bar" around the side and bottom of the display, with the rest of the display showing content protected with HDCP. This was achieved without any issues, thanks to the flexibility of IPMX devices that can receive both ST 2110 and AES67 content, making it easier to connect asynchronous sources to synchronous live production systems.

During the project, Wireshark dissectors for HKEP and IPMX RTCP sender reports were found, revealing no unusual issues. However, the HDMI switch in the breakroom was found to be sending out strange audio info frames with large values in the LATENCY field. To compensate for this, the Link Offset Delay property of the IPMX receiver was used.

In the break room, the old panel displaying content was upgraded with a new panel displaying digital signage and over-the-air content. NMOS IS-11's connection negotiation capabilities helped multicast to both new and older monitors in the system, ensuring a seamless transition.

The development of the IPMX standard was officially completed in August 2023. The IPMX sender device supports TR-10-10 (draft available soon), which provides HDMI info frames over IP. The project serves as a testament to the potential of IPMX, paving the way for more efficient and versatile AV over IP solutions.

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