Thanks for asking.
For very tight turnaround, i.e. editing the timeline as it plays to air, the only current solution dates from 2008.
The main USP is to be able to edit & review a timeline with growing files as that timeline is playing to air.
e.g. edting down a 3 hour awards show that starts to air 2 hours after the live show begins - to fit 90 minute continuous TX. Simple edits but require asynchronous video cutaways to cover the joins. IPEdit can make changes to the timeline as close as 10" before that portion airs.
Doing it with other NLEs require that the exports be stitched together in an EVS playlist as it plays to air, plus the closest to air time you can make an edit is “duration of export chunk” + “latency of stream to NLE” + “time it takes to export and add to playlist” + “safety factor” - if doing 10 minute chunks then that is probably 15 minutes minimum. Plus there’s wrangling if you want to make changes…
Here’s a brief guide to what IPEdit does with a timeline GUI -
‘TLE’ - timeline edit
1 Timeline video track
Timeline audio tracks can be 1x16 track container, 16x mono or anything in between.
Cuts + mixes only on both
Access to any recording stream, clips in timeline are open ended (ie can be extended into future and fill in automatically - growing files on PP / Avid can only be extended once that part of the file is filled in).
EWP - Edit While Playout
‘TLO’ - timeline output - starts as a duplicate of the TLE.
Independent output of both so TLO can play to air whilst still being edited in TLE.
TLO has its own transport + playback controls.
TLE changes can be reviewed then ‘committed’ to TLO.
Changes can be made up to a few seconds of TLO airing (red bar shows ‘protected’ area)
Use cases:
PLAYOUT AFTER EDIT - TLE ONLY -
Sports events quick turnaround music pieces.
V - Cuts/mixes between various isos
A1 - async commentary (mono)
A2 - async/sync FX (stereo)
A3 - async MX (stereo)
Played to air direct from TLE as close as 2 mins after event happens.
Advantage over PP/Avid = no ingest or render time - instant access + playout.
EWP / TLO - editing as it plays to air
Gig, artist on stage + live internationally at 20.45, UK delayed TX at 21.00
TLE timecode set to 1900, copied to TLO and played so whatever is on TLE at 2100 will be played out on TLO (set + forget).
Ident, lineup, countdown, opening titles added to TLE so opening titles will play at 2100. Commit to TLO.
At 20.45, edit from Int TX feed to end of opening titles. Check edit. Extend out to 2300. Commit to TLO.
Now the concert is effectively delayed by 15.5 mins, if no other edits made.
(Make further edits, insert commercials, tighten bits between songs, remove profanities, libels etc with alternate angles, mix minus audio etc).