output

Where the generated media goes and in what form. Required.

output:
  video_path: "{output}/pal_disc.cvbs"
  signal_type: composite
  truth: true

Keys

Key	Type	Required	Values	Default
video_path	string	Yes	A path, optionally with an asset root token	—
signal_type	string	No	composite, yc	composite
truth	bool	No	true, false	false

No other key is accepted. In particular the metadata sidecar path is not configurable — it is derived from video_path and always sits beside it. LaserDisc EFM digital audio is selected in the laserdisc block; its files are written here, beside the video.

video_path

The path of the primary sample file. Every other artefact is colocated with it and named from it.

signal_type	Required suffix	Files written
composite	.cvbs by convention	<name>.cvbs
yc	.cvbsy (enforced)	<name>.cvbsy and <name>.cvbsc

With signal_type: yc the path must end in .cvbsy; the chroma path is derived by replacing that suffix with .cvbsc.

The derived paths:

Artefact	Derivation
.meta	video_path with .cvbs/.cvbsy replaced by .meta (any other extension is replaced too; with none, .meta is appended)
.dropouts.meta	The metadata path with .meta replaced by .dropouts.meta
_audio_<pair>.wav	video_path with .cvbs/.cvbsy stripped, plus _audio_<pair>.wav
.efm, .efm.meta	video_path with .cvbs/.cvbsy stripped, plus the suffix
.truth, .truth.meta	video_path with .cvbs/.cvbsy stripped, plus the suffix

Parent directories are created automatically.

Use {output}

Write "{output}/name.cvbs" rather than a bare relative path. {output} defaults to the project file's own directory, so a project stays self-contained when run by hand, while --output-root lets a batch run redirect every project at once. A bare relative path resolves against the working directory in the CLI but against the project directory in the GUI.

signal_type

• composite — luma and chroma summed into a single signal.
• yc — luma and chroma written separately.

Luma and chroma are generated independently regardless; this only selects whether they are combined before writing.

truth

true writes the picture truth: the component Y, U and V that went into the composite modulator, for scoring a decoder against the source picture rather than against its own Y/C separation. PAL, NTSC and PAL-M only.

The truth is taken after every step applied before modulation, and before any impairment:

Included	Excluded
The source-to-4fsc horizontal mapping	channel (timing offset, edge smear)
The section's luma_bandwidth limit	The LaserVision channel (FM beat, group delay, replay response)
The chroma low-pass (33-tap Hamming-windowed 1.3 MHz for PAL and PAL-M, 17-tap 1.2 MHz for NTSC)	chroma_error and line_timing
chroma_line_sign regions	Noise and dropouts
laserdisc.channel.field2_offset, which changes the picture that is modulated	OSD text (drawn afterwards; a warning)
The section's picture_response (horizontal and vertical)

.truth

Raw little-endian float32, frame after frame in output order. Each frame is three planes — Y, then U, then V — and each plane is rows × samples_per_line values in row-major order:

Standard	samples_per_line	rows	first_sample	Field 1 / field 2 first line	Even rows from
PAL	922	576	177	23 / 336	Field 1
NTSC	745	480	150	22 / 284	Field 2
PAL-M	745	480	150	22 / 284	Field 2

• A row covers the 4fsc active window of one active line, starting first_sample samples after 0H. Rows are in progressive order, as the source picture's rows are drawn: the field whose picture opens higher on the screen supplies the even rows.
• Y is in mV above blanking (NTSC and PAL-M include the setup, so black is at black_mv).
• U and V are the low-pass-filtered colour-difference components, in peak mV of subcarrier, exactly as modulated: U on the sin carrier axis and V on the cos axis (NTSC: B−Y and R−Y). V has the PAL V-switch removed, as a PAL decoder recovers it, so a chroma_line_sign v: follow_switch region appears as V alternating line by line.
• Over the active window the modulated chroma is C = U · sin φ + s · V · cos φ, where φ is the subcarrier phase and s the line's V-switch sign (+1 throughout NTSC).
• Samples past the end of the PAL half-picture line 623 carry no picture and are zero.

.truth.meta

A SQLite database, like the other sidecars, with PRAGMA user_version = 1 and one row in a truth_file table:

Column	Type	Contents
truth_file_id	INTEGER	Always 1
video_standard	TEXT	PAL, NTSC or PAL_M
sample_rate_hz	REAL	The 4fsc sampling rate
frame_count	INTEGER	Frames in the truth file
samples_per_line, rows	INTEGER	Plane dimensions
first_sample	INTEGER	Offset of a row's first sample from 0H
first_line_field1, first_line_field2	INTEGER	Frame line carrying each field's first row
upper_field	INTEGER	Field (1 or 2) supplying the even rows
half_picture_line, half_picture_end_sample	INTEGER	The PAL half-picture line (623) and the sample offset where its picture ends; 0 when every line is full
plane_order	TEXT	YUV
sample_format	TEXT	float32le
units	TEXT	mV
y_reference	TEXT	blanking
black_mv, white_mv	REAL	Black and white levels above blanking, for normalising Y
u_axis, v_axis	TEXT	sin, cos: the carrier axes U and V modulate
v_switch	TEXT	removed: V is given as a PAL decoder recovers it

Validation: truth: true on a SECAM project is an error. On a project with OSD overlays it is a warning, as the truth does not carry the text. A value other than true or false is a parse error. The emitter writes the key only when it is true.