Implementing Uncompressed over IP in software and the pitfalls

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Kieran Kunhya

Presentation given at Open Source meetup at IBC Show.

Technology

Implementing uncompressed over
IP in software and the pitfalls
Kieran Kunhya <kierank@obe.tv>

Hardware
• Need to reduce OS overhead (see BBC R&D @
UKNOF)
– Netmap, PF_RING, Registered I/O (Windows)
– Craft packets yourself
• Limits hardware choices, kernel versions, tunings
• 2022-7 (hitless switching) using kernel bypass
directly – two cards at the same time?

Software
• SDI frame bugs few have encountered
• CRCs costly and arguably unnecessary
• Many pixel formats (most broadcast specific)
• Slow format conversions without handwritten
assembly code (10x speed boosts)
• Non mod-6 line width (1280x720) annoying
• Written in Upipe (think Apache vs nginx).
• Unicast ARP problems

We’re hiring!
Work at the SpaceX of broadcast

• Upipe.org
• BBC R&D UKNOF -
https://www.youtube.com/watch?v=yLL8wl8YUwA

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