Iphrame’s TimeLock Functionality
Key to the operation is Iphrame’s TimeLock functionality, which ensures all sources and processing is accurately timestamped using PTP reference clocks. The latencies, which are unavoidable with any remote or IP-based solution, are carefully measured and compensated for.
Timestamped Proxy Feeds
TimeLock enables control surfaces to operate using timestamped proxy feeds at a known time-offset so that switching decisions can then be performed remotely in high-res on the exact frame the operator intended. Iphrame even provides an instant simulation of the mix generated from the proxy feeds, giving the operator an instant visual response as if they were controlling a local device.
Iphrame Remote works by consolidating all SDI and IP sources at an event within a server deployed at the event site. The server buffers these streams, generates proxies of them and pushes them back up into the cloud.
From here an operator can use an Iphrame client to view the proxy streams frame accurately and make switching decisions which are passed back to the remote site. The Iphrame Engine then generates a high-bit-rate, high-quality output, ready for lightning-fast transmission to multiple platforms across the globe.
1-stage remote controlled mixing is the basis of our simplest Iphrame offering, Iphrame Flyaway.
However, for higher value productions it is likely that video/audio source generated local to the production team may need to be used (e.g. External graphics, locally edited content). To enable this a second stage vision/audio mix can be performed at the production centre and thanks to Timelock this can be frame accurately switched without the operational staff treating remote and local sources differently.
This general 2-stage architecture formed the basis of a trial with BBC Sport for Euro 2016. This concept can be extended to allow mixing at multiple locations and in multiple time offsets bringing together sources from multiple events through limited bandwidth links, maintaining frame accurate control at each stage. Multi-stage mixing solutions are customised to specific customer requirements so are sold as Iphrame Enterprise.
More detail about time compensated production and how it compares to other methods is covered in the presentation video below.