vah264enc
vah264enc 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 ! vah264enc ! h264parse ! mp4mux ! filesink location=test.mp4
Hierarchy
GObject ╰──GInitiallyUnowned ╰──GstObject ╰──GstElement ╰──GstVideoEncoder ╰──GstVaBaseEnc ╰──vah264enc
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 ]
Properties
aud
“aud” gboolean
Insert the AU (Access Unit) delimeter for each frame.
Flags : Read / Write / Construct
Default value : false
b-frames
“b-frames” guint
Number of B-frames between two reference frames.
Flags : Read / Write / Construct
Default value : 0
b-pyramid
“b-pyramid” gboolean
Enable the b-pyramid reference structure in GOP.
Flags : Read / Write / Construct
Default value : false
bitrate
“bitrate” guint
The desired target bitrate, expressed in kbps. Not available in CQP mode.
- CBR: This applies equally to the minimum, maximum and target bitrate.
- VBR: This applies to the target bitrate. The driver will use the "target-percentage" together to calculate the minimum and maximum bitrate.
- VCM: This applies to the target bitrate. The minimum and maximum bitrate are not needed.
Flags : Read / Write / Construct
Default value : 0
cabac
“cabac” gboolean
It enables CABAC entropy coding mode to improve compression ratio, but requires main profile at least.
Flags : Read / Write / Construct
Default value : true
cc-insert
“cc-insert” gboolean
Closed Caption Insert mode. Only CEA-708 RAW format is supported for now.
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. This improves the compression ratio but requires high profile at least.
Flags : Read / Write / Construct
Default value : true
i-frames
“i-frames” guint
Force the number of i-frames insertion within one GOP.
Flags : Read / Write / Construct
Default value : 0
key-int-max
“key-int-max” guint
The maximal distance between two keyframes.
Flags : Read / Write / Construct
Default value : 0
max-qp
“max-qp” guint
The maximum quantizer value.
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
The minimum quantizer value.
Flags : Read / Write / Construct
Default value : 1
num-slices
“num-slices” guint
The 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 other mode, it specifies the init QP of all frames.
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_render-d128 *
The desired rate control mode for the encoder
Flags : Read / Write / Construct
Default value : cbr (2)
ref-frames
“ref-frames” guint
The number of reference frames.
Flags : Read / Write / Construct
Default value : 3
target-percentage
“target-percentage” guint
The target percentage of the max bitrate, and expressed in uint, equal to "target percentage" * 100. Available only when rate-control is VBR.
"target percentage" = "target bitrate" * 100 / "max bitrate"
The driver uses it to calculate the minimum and maximum bitrate.
Flags : Read / Write / Construct
Default value : 66
target-usage
“target-usage” guint
The target usage of the encoder.
It controls and balances the encoding speed and the encoding quality. The lower value has better quality but slower speed, the higher value has faster speed but lower quality.
Flags : Read / Write / Construct
Default value : 4
trellis
“trellis” gboolean
It enable the trellis quantization method. Trellis is an improved quantization algorithm.
Flags : Read / Write / Construct
Default value : false
Named constants
Va-encoder-rate-control_h264_render-d128
Members
cbr
(2) – Constant Bitrate
vbr
(4) – Variable Bitrate
cqp
(16) – Constant Quantizer
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