theoraenc

This element encodes raw video into a Theora stream. Theora is a royalty-free video codec maintained by the Xiph.org Foundation, based on the VP3 codec.

The theora codec internally only supports encoding of images that are a multiple of 16 pixels in both X and Y direction. It is however perfectly possible to encode images with other dimensions because an arbitrary rectangular cropping region can be set up. This element will automatically set up a correct cropping region if the dimensions are not multiples of 16 pixels.

To control the quality of the encoding, the and properties can be used. These two properties are mutualy exclusive. Setting the bitrate property will produce a constant bitrate (CBR) stream while setting the quality property will produce a variable bitrate (VBR) stream.

A videorate element is often required in front of theoraenc, especially when transcoding and when putting Theora into the Ogg container.

Example pipeline

 gst-launch-1.0 -v videotestsrc num-buffers=500 ! video/x-raw,width=1280,height=720 ! queue ! progressreport ! theoraenc ! oggmux ! filesink location=videotestsrc.ogg

This example pipeline will encode a test video source to theora muxed in an ogg container. Refer to the theoradec documentation to decode the create stream.

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstVideoEncoder
                    ╰──theoraenc

Implemented interfaces

Factory details

Authors: – Wim Taymans

Classification:Codec/Encoder/Video

Rank – primary

Plugin – theora

Package – GStreamer Base Plug-ins

Pad Templates

sink

video/x-raw:
         format: { I420, Y42B, Y444 }
      framerate: [ 1/2147483647, 2147483647/1 ]
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]

Presencealways

Directionsink

Object typeGstPad


src

video/x-theora:
      framerate: [ 1/2147483647, 2147483647/1 ]
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]

Presencealways

Directionsrc

Object typeGstPad


Properties

bitrate

“bitrate” gint

Compressed video bitrate (kbps)

Flags : Read / Write

Default value : 0


cap-overflow

“cap-overflow” gboolean

Enable capping of bit reservoir overflows

Flags : Read / Write

Default value : true


cap-underflow

“cap-underflow” gboolean

Enable capping of bit reservoir underflows

Flags : Read / Write

Default value : false


drop-frames

“drop-frames” gboolean

Allow or disallow frame dropping

Flags : Read / Write

Default value : true


keyframe-auto

“keyframe-auto” gboolean

Automatic keyframe detection

Flags : Read / Write

Default value : true


keyframe-force

“keyframe-force” gint

Force keyframe every N frames

Flags : Read / Write

Default value : 64


keyframe-freq

“keyframe-freq” gint

Keyframe frequency

Flags : Read / Write

Default value : 64


multipass-cache-file

“multipass-cache-file” gchararray

Multipass cache file

Flags : Read / Write

Default value : NULL


multipass-mode

“multipass-mode” Theora-enc-multipass-mode *

Single pass or first/second pass

Flags : Read / Write

Default value : single-pass (0)


quality

“quality” gint

Video quality

Flags : Read / Write

Default value : 48


rate-buffer

“rate-buffer” gint

Sets the size of the rate control buffer, in units of frames. The default value of 0 instructs the encoder to automatically select an appropriate value

Flags : Read / Write

Default value : 0


speed-level

“speed-level” gint

Controls the amount of motion vector searching done while encoding

Flags : Read / Write

Default value : 1


vp3-compatible

“vp3-compatible” gboolean

Disables non-VP3 compatible features

Flags : Read / Write

Default value : false


Named constants

Theora-enc-multipass-mode

Members

single-pass (0) – Single pass
first-pass (1) – First pass
second-pass (2) – Second pass

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