fieldanalysis

fieldanalysis

Properties

guint64 block-height Read / Write
guint64 block-threshold Read / Write
guint64 block-width Read / Write
FieldAnalysisCombMethod comb-method Read / Write
GstFieldAnalysisFieldMetric field-metric Read / Write
gfloat field-threshold Read / Write
GstFieldAnalysisFrameMetric frame-metric Read / Write
gfloat frame-threshold Read / Write
guint64 ignored-lines Read / Write
guint noise-floor Read / Write
gint64 spatial-threshold Read / Write

Types and Values

struct GstFieldAnalysis

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstFieldAnalysis

Description

Analyse fields from video buffers to identify whether the buffers are progressive/telecined/interlaced and, if telecined, the telecine pattern used.

Example launch line

1
 
gst-launch-1.0 -v uridecodebin uri=/path/to/foo.bar ! fieldanalysis ! deinterlace ! videoconvert ! autovideosink

This pipeline will analyse a video stream with default metrics and thresholds and output progressive frames.

Synopsis

Element Information

plugin

 fieldanalysis

author

 Robert Swain <robert.swain@collabora.co.uk>

class

 Filter/Analysis/Video

Element Pads

name

 sink

direction

 sink

presence

 always

details

 video/x-raw, format=(string){ YUY2, UYVY, Y42B, I420, YV12 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

name

 src

direction

 source

presence

 always

details

 video/x-raw, format=(string){ YUY2, UYVY, Y42B, I420, YV12 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

Functions

Types and Values

struct GstFieldAnalysis

struct GstFieldAnalysis;

Property Details

The “block-height” property

  “block-height”             guint64

Block height for windowed comb detection.

Flags: Read / Write

Default value: 16

The “block-threshold” property

  “block-threshold”          guint64

Block threshold for windowed comb detection.

Flags: Read / Write

Default value: 80

The “block-width” property

  “block-width”              guint64

Block width for windowed comb detection.

Flags: Read / Write

Allowed values: >= 1

Default value: 16

The “comb-method” property

  “comb-method”              FieldAnalysisCombMethod

Metric to be used for identifying comb artifacts if using windowed comb detection.

Flags: Read / Write

Default value: 5-tap [1,-3,4,-3,1] vertical filter result is larger than spatial threshold*6

The “field-metric” property

  “field-metric”             GstFieldAnalysisFieldMetric

Metric to be used for comparing same parity fields to decide if they are a repeated field for telecine.

Flags: Read / Write

Default value: Sum of Squared Differences

The “field-threshold” property

  “field-threshold”          gfloat

Threshold for field metric decisions.

Flags: Read / Write

Allowed values: >= 0

Default value: 0.08

The “frame-metric” property

  “frame-metric”             GstFieldAnalysisFrameMetric

Metric to be used for comparing opposite parity fields to decide if they are a progressive frame.

Flags: Read / Write

Default value: 5-tap [1,-3,4,-3,1] Vertical Filter

The “frame-threshold” property

  “frame-threshold”          gfloat

Threshold for frame metric decisions.

Flags: Read / Write

Allowed values: >= 0

Default value: 0.002

The “ignored-lines” property

  “ignored-lines”            guint64

Ignore this many lines from the top and bottom for windowed comb detection.

Flags: Read / Write

Allowed values: >= 2

Default value: 2

The “noise-floor” property

  “noise-floor”              guint

Noise floor for appropriate metrics (per-pixel metric values with a score less than this will be ignored).

Flags: Read / Write

Default value: 16

The “spatial-threshold” property

  “spatial-threshold”        gint64

Threshold for combing metric decisions.

Flags: Read / Write

Allowed values: >= 0

Default value: 9

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