AV-over-IP's Evolution: The Crucial Records Predefining the Next Generation of Audiovisual Transmission (IPMX)
In the heart of a bustling office, the break room is more than just a place for employees to unwind. It's a hub for collaboration and information exchange. Recently, the team faced a challenge when the audio and video in the break room's AV system started to fall out of sync.
The root of the problem was traced to the HDMI switch in the breakroom, which was sending out very strange audio info frames with large values in the LATENCY field. This indicated a problem with the switch, causing the audio and video to become desynchronized.
To address this issue, the team decided to integrate a gateway from an unfamiliar manufacturer into the IP Media Experience (IPMX) system. This gateway, capable of frame rate conversion, helped to bridge compatibility gaps, ensuring seamless operation.
The IPMX sender device supported TR-10-10, a draft soon to be available, which provides HDMI info frames over IP. This feature was instrumental in maintaining the synchronization of audio and video within the IPMX system.
During troubleshooting, Wireshark dissectors for HKEP and IPMX RTCP sender were found, providing insight into the packets but not revealing any obvious issues. The Link Offset Delay property in the IPMX receiver was used to compensate for the inaccurate values given to the IPMX sender by the HDMI switch, allowing for the synchronization of audio and video.
The older monitors in the project only supported 4K30, falling short of the project's 4K60 specification. However, the IPMX solution's ability to receive both ST 2110 and AES67 content simplified the connection of the huddle room to the live production system in the auditorium.
The digital signage system in the project, which included older monitors encased in custom cabinets, presented an EDID-related headache during multicasting. Nevertheless, the team was able to overcome this challenge.
The 'secure' huddle room required content to be encrypted, introducing the Privacy Encryption Protocol (PEP), outlined in TR-10-13. This protocol, developed by Macnica, ensures multi-vendor, interoperable encryption for video, audio, and USB traffic, ensuring the privacy of sensitive information.
IPMX, rooted in the Video Services Forum (VSF) TR-10 and Advanced Media Workflow Association (AMWA) NMOS specifications, introduces capabilities that are unprecedented in the AV-over-IP space. In a real-world scenario, IPMX was used to upgrade and expand an existing AV system, integrating legacy baseband equipment with new IPMX endpoints.
The new panel in the break room displays a mix of digital signage and over-the-air content, with company announcements shown in an "L-bar" around the side and bottom of the display. The advent of NMOS IS-12 enables seamless integration of new, untested devices in IPMX systems, making upgrades and expansions even easier.
As the IPMX solution continues to be finalized, with several core documents ratified and final testing scheduled for later this year, it promises to revolutionize the way we handle AV systems, making them more efficient, secure, and versatile.
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