gst-launch中video/x-raw,format=GRAY8的含义

本文转自：https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-plugins/html/gstreamer-plugins-capsfilter.html

capsfilter capsfilter

Properties

GstCaps *	caps	Read / Write
GstCapsFilterCapsChangeMode	caps-change-mode	Read / Write

Types and Values

struct	GstCapsFilter
enum	GstCapsFilterCapsChangeMode

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstBaseTransform
                    ╰── GstCapsFilter

Description

The element does not modify data as such, but can enforce limitations on the data format.

Example launch line

1	gst-launch-1.0 videotestsrc ! capsfilter caps=video/x-raw,format=GRAY8 ! videoconvert ! autovideosink

Limits acceptable video from videotestsrc to be grayscale. Equivalent to

1	gst-launch-1.0 videotestsrc ! video/x-raw,format=GRAY8 ! videoconvert ! autovideosink

which is a short notation for the capsfilter element.

Synopsis

Element Information

plugin	coreelements
author	David Schleef <ds@schleef.org>
class	Generic

---

Element Pads

name	sink
direction	sink
presence	always
details	ANY

name	src
direction	source
presence	always
details	ANY

Functions

 

Types and Values

struct GstCapsFilter

struct GstCapsFilter;

The opaque GstCapsFilter data structure.

---

enum GstCapsFilterCapsChangeMode

Filter caps change behaviour

Members

GST_CAPS_FILTER_CAPS_CHANGE_MODE_IMMEDIATE	Only accept the current filter caps
GST_CAPS_FILTER_CAPS_CHANGE_MODE_DELAYED	Temporarily accept previous filter caps

Property Details

The “caps” property

  “caps”                     GstCaps *

Restrict the possible allowed capabilities (NULL means ANY). Setting this property takes a reference to the supplied GstCaps object.

Flags: Read / Write

---

The “caps-change-mode” property

  “caps-change-mode”         GstCapsFilterCapsChangeMode

Filter caps change behaviour.

Flags: Read / Write

Default value: Only accept the current filter caps