vah264lpenc

vah264lpenc encodes raw video VA surfaces into H.264 bitstreams using the installed and chosen VA-API driver.

The raw video frames in main memory can be imported into VA surfaces.

Example launch line

gst-launch-1.0 videotestsrc num-buffers=60 ! timeoverlay ! vah264lpenc ! h264parse ! mp4mux ! filesink location=test.mp4

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstVideoEncoder
                    ╰──GstVaBaseEnc
                        ╰──vah264lpenc

Implemented interfaces

Factory details

Authors: – He Junyan

Classification: – Codec/Encoder/Video/Hardware

Rank – none

Plugin – va

Package – GStreamer Bad Plug-ins

Pad Templates

sink

video/x-raw(memory:VAMemory):
         format: { NV12 }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
video/x-raw:
         format: { NV12 }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]

Presence – always

Direction – sink

Object type – GstPad

src

video/x-h264:

Presence – always

Direction – src

Object type – GstPad

Properties

aud 

“aud” gboolean

Insert AU (Access Unit) delimeter for each frame

Flags : Read / Write / Construct

Default value : false

b-frames 

“b-frames” guint

Number of B frames between I and P reference frames

Flags : Read / Write / Construct

Default value : 0

b-pyramid 

“b-pyramid” gboolean

Enable the b-pyramid reference structure in the GOP

Flags : Read / Write / Construct

Default value : false

bitrate 

“bitrate” guint

The desired bitrate expressed in kbps (0: auto-calculate)

Flags : Read / Write / Construct

Default value : 0

cabac 

“cabac” gboolean

Enable CABAC entropy coding mode

Flags : Read / Write / Construct

Default value : true

cc-insert 

“cc-insert” gboolean

Insert CEA-708 Closed Captions

Flags : Read / Write / Construct

Default value : true

cpb-size 

“cpb-size” guint

The desired max CPB size in Kb (0: auto-calculate)

Flags : Read / Write / Construct

Default value : 0

dct8x8 

“dct8x8” gboolean

Enable adaptive use of 8x8 transforms in I-frames

Flags : Read / Write / Construct

Default value : true

i-frames 

“i-frames” guint

Force the number of I frames insertion within one GOP, not including the first IDR frame

Flags : Read / Write / Construct

Default value : 0

key-int-max 

“key-int-max” guint

The maximal distance between two keyframes. It decides the size of GOP (0: auto-calculate)

Flags : Read / Write / Construct

Default value : 0

max-qp 

“max-qp” guint

Maximum quantizer value for each frame

Flags : Read / Write / Construct

Default value : 51

mbbrc 

“mbbrc” GstVaFeature *

Macroblock level Bitrate Control. Not available in CQP mode

Flags : Read / Write / Construct

Default value : auto (2)

min-qp 

“min-qp” guint

Minimum quantizer value for each frame

Flags : Read / Write / Construct

Default value : 1

num-slices 

“num-slices” guint

Number of slices per frame

Flags : Read / Write / Construct

Default value : 1

qpb 

“qpb” guint

The quantizer value for B frame. Available only in CQP mode

Flags : Read / Write / Construct

Default value : 26

qpi 

“qpi” guint

The quantizer value for I frame. In CQP mode, it specifies the QP of I frame. In ICQ and QVBR modes, it specifies a quality factor. In other modes, it is ignored

Flags : Read / Write / Construct

Default value : 26

qpp 

“qpp” guint

The quantizer value for P frame. Available only in CQP mode

Flags : Read / Write / Construct

Default value : 26

rate-control 

“rate-control” Va-encoder-rate-control_h264_lp_render-d128 *

The desired rate control mode for the encoder

Flags : Read / Write / Construct

Default value : cqp (16)

ref-frames 

“ref-frames” guint

Number of reference frames, including both the forward and the backward

Flags : Read / Write / Construct

Default value : 3

target-percentage 

“target-percentage” guint

The percentage for 'target bitrate'/'maximum bitrate' (Only in VBR)

Flags : Read / Write / Construct

Default value : 66

target-usage 

“target-usage” guint

The target usage to control and balance the encoding speed/quality

Flags : Read / Write / Construct

Default value : 4

trellis 

“trellis” gboolean

Enable the trellis quantization method

Flags : Read / Write / Construct

Default value : false

Named constants

Va-encoder-rate-control_h264_lp_render-d128

Members

cqp (16) – Constant Quantizer

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