Glossary

Terms used throughout the Video CutterV2 and its documentation.

Camera angle

Which camera a recording came from — typically a front and a rear view of the same mat. Its short identifier is the camera key, and it is defined by the operator in FR Recorder's Angles and scenes editor. The camera key becomes the last part of the clip's file name. See Camera Angles.

Clip

One short video file produced by the CutterV2: one contest, from one camera. Contrast with a recording, which is the long file it was cut out of.

Companion file

The small .json file written next to every automatically produced clip, with the same name plus .json. It carries the contest details so the Video Ingester can upload the clip without anyone typing a contest code. It is also how the CutterV2 remembers what it has already cut. See the clip and its companion file.

Contest

One fight between two judoka. Called a fight in the program's own statistics and log.

Contest code

The identifier of one specific fight, for example cont_cup_jun_mac2026_0007_m_p100_0009. It is the first part of a clip's file name and is what ties the video to a fight on the platform.

Cutting processor

One worker inside the CutterV2 that cuts one clip at a time. Between 1 and 4 of them handle automatic cutting (3 by default), each with its own progress bar, and the CutterV2 always creates one more on top of that number for manual and test cutting. See Number of Cutting Processors.

Cutting Start Mode

The setting that decides how much build-up each clip includes — the whole introduction, part of it, or just the fight. See choosing where the clip starts.

Display mode

The picture the scoreboard is currently showing: mode 3 the white competitor, mode 4 the blue competitor, mode 5 both competitors together with the round of the contest, mode 6 the contest screen with the clock and scores, mode 7 the winner, mode 13 no winner. Mode 6 is the moment the clock is displayed, not the moment it starts — hajime follows a few seconds later. The usual run-up is white, then blue, then both — but the order of white and blue is a scoreboard setting and cards are sometimes skipped entirely. JudoNet records the moment each screen appeared, and those moments are the only timing information the CutterV2 has. See display modes.

External ID

The identifier of the whole competition, for example cont_cup_jun_mac2026, as opposed to a single contest. The CutterV2 sends it to JudoNet to ask for that event's contests. Normally filled in automatically when you select a JudoNet server. See External ID.

FairReplay Cloud

The website where licences and machine activations are managed: https://backend.fairreplay.com.

FFmpeg

A widely used, free video tool that ships with the CutterV2. It copies a section out of a finished recording without decoding it, which is far faster than the internal engine — but it can only be used once a recording has stopped. See the two cutting engines.

FR Recorder

Short for FairReplay Recorder: the program that records the mats continuously. The CutterV2 asks it which recordings exist and reads the video files from its shared folder.

I-frame

See keyframe.

JudoNet

The program on the scoreboard PC that records what the scoreboard displayed and when. It is the CutterV2's only source of timing information, and it also tells the CutterV2 which competition is currently running.

Keyframe

A video frame that can be decoded on its own, without reference to the frames around it. Also called an I-frame. A clip has to begin at one, which is why a clip may start a fraction of a second earlier than requested.

Machine key

A fingerprint built from the PC's hardware, used to tie a licence to one machine. See Machine keys and activations.

Mat

One fighting area. Mats are numbered 1, 2, 3… In FR Recorder each mat is a scene, and its scene key must be mat1, mat2, and so on, or the CutterV2 cannot match recordings to contests.

MediaLooks

The CutterV2's internal cutting engine. Slower than FFmpeg, but it can cut from a recording that is still being written — which is the normal situation during a live event. See the two cutting engines.

Multicast

A way of sending one network message to any machine that is interested, rather than to one specific address. JudoNet and FR Recorder announce themselves this way, on group 239.225.89.212. Some networks block multicast, which is why the discovery window is sometimes empty. See No servers appear.

Post-festum cutting

Cutting a competition after it has finished, rather than while it is running. Much faster, because every recording is finished and FFmpeg can be used. See cutting after the event.

Queue

The list of clips waiting to be cut. There are two: a high-priority queue for cameras whose key contains Front, and a normal queue for everything else. The high-priority queue is always emptied first.

Recording

One long, continuous video file produced by FR Recorder for one camera on one mat, typically covering a whole session. The CutterV2 cuts clips out of it and never modifies it.

Scene

FR Recorder's word for "which mat this camera is pointed at". Its short identifier is the scene key and it must be mat1, mat2, mat3… for the CutterV2 to work. The scene key becomes the middle part of the clip's file name.

Test clip

A short clip, roughly 11 seconds long, produced by the Test cutting button to prove that a recorder is reachable and that cutting works. Named <address>-<date>-<time>-test_clip.mp4. Excluded from the statistics but not deleted automatically — remove them before starting a real event. See Test cutting.

Throttling

Making the cutting processors wait when the PC is already busy, so the CutterV2 does not monopolise a machine that is also doing other things. See Use CPU Usage Throttling.

Video Ingester

The companion program that watches the CutterV2's output folder, uploads the clips and asks the platform to attach them to the right contest. See its own documentation.