AV-over-IP Landmark Documents Analysis: Understanding the Pivotal Papers Guiding IPMX's Future in Audio-Visual Transmission
In the world of professional AV and broadcast environments, a new era of simplicity and efficiency is on the horizon with the advent of IPMX, an open, interoperable AV-over-IP standard. This groundbreaking standard, designed primarily for professional AV and broadcast environments, aims to enable seamless integration and easier interoperability of video, audio, and control over IP networks.
IPMX is rooted in the SMPTE ST 2110 and AES67 standards, and the Video Services Forum (VSF) TR-10 and Advanced Media Workflow Association (AMWA) NMOS specifications. These foundational technologies provide a robust basis for IPMX, ensuring compatibility and interoperability across various systems.
One real-world scenario illustrates the challenges and solutions presented by IPMX. A system designer and field technician encountered an issue with a digital signage system that retained older monitors not slated for replacement, leading to an EDID-related headache. However, the custom-encased monitors were saved by the integration of a gateway that addressed the compatibility issue.
In this same setup, the break room display panel was upgraded to show a mix of digital signage and over-the-air content, with a desire to display company announcements in an "L-bar" around the side and bottom of the display. The NMOS IS-11 specification, which allows for connection negotiation capabilities in IPMX systems, played a crucial role in achieving this goal.
The journey towards the full realization of IPMX invites users to usher in a new era of simplicity and efficiency in professional AV environments. However, challenges remain, such as ensuring audio and video synchronisation. In one instance, the audio and video were found to be out of sync, leading to a search for the cause. No issues were found with HKEP or IPMX RTCP sender reports, but an HDMI switch in the breakroom was discovered to be sending out strange audio info frames with large values in the LATENCY field.
To address the resolution issue, a potential solution is adding a gateway from an unfamiliar manufacturer that is capable of frame rate conversion, thanks to the NMOS IS-12 specification. This specification enables direct adjustment of settings for scaling and frame rate conversion through a controller in IPMX systems.
Moreover, in environments where content traffic must be encrypted, the Privacy Encryption Protocol (PEP), outlined in TR-10-13, ensures multi-vendor, interoperable encryption for video, audio, and USB traffic. An IPMX solution capable of handling content mixing while adhering to HDCP through the HKEP protocol is used, which is IPMX's DCP-approved protocol for handling HDCP-compliant key exchange defined in TR-10-5.
As IPMX moves towards finalization, with ratified core documents and scheduled final testing for later this year, it is clear that this standard represents a significant leap towards a comprehensive, interoperable standard for professional AV. Whether it's minimizing latency for Image Magnification (IMAG) in auditoriums or ensuring secure content transmission in huddle rooms, IPMX is poised to revolutionise the professional AV landscape.
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