i.MX ProcessorsのトピックRe: Set VBR with bitrate limit IMX8MM

Set VBR with bitrate limit IMX8MM

DR_Akzhol — Mon, 12 May 2025 09:49:28 GMT

Hello there, could you find a solution for that? We have tested VBR with highprofile mode. At DAY we have normal Bitrate 100kb-3Mb, night time camera gives more noise, so the bitrate goes to 15-20Mb (too big files at night). How can we limit the upper bitrate for VBR mode, or what kind of parameters can be adjusted to get lower bitrate at night

Re: Set VBR with bitrate limit IMX8MM

Manuel_Salas — Tue, 13 May 2025 18:14:13 GMT

Hello @DR_Akzhol

I hope you are doing very well.

Could you please share more details about your application?

What BSP you are using? Are you using GStreamer, V4L2?

Best regards,

Salas.

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Wed, 14 May 2025 05:36:19 GMT

Hello Manuel,
Ubuntu, Kernel 5.4.70
Modified VPU driver to enable highprofile
Using Gstreamer included into Ubuntu and V4L2, VPUENC plugin.

VBR: Set Quant = 35, bitrate = 0(default)

Our goal is to get VBR in range up to 3Mb bitrate (not above this)

Re: Set VBR with bitrate limit IMX8MM

Manuel_Salas — Wed, 14 May 2025 06:30:00 GMT

Hello @DR_Akzhol

you can try setting an explicit maximum bitrate. Try the following:

$ gst-launch-1.0 v4l2src ! videoconvert ! vpuenc_h264 bitrate=0 quant=35 max-bitrate=3000000 ! mp4mux ! filesink location=output.mp4

Best regards,

Salas.

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Wed, 14 May 2025 10:31:36 GMT

We do not see this option for vpuenc. See message:
"WARNING: erroneous pipeline: no property "max-bitrate" in element "vpuenc_h264-0""

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Mon, 19 May 2025 05:54:56 GMT

Is there any solution for this?

Re: Set VBR with bitrate limit IMX8MM

Manuel_Salas — Mon, 19 May 2025 17:18:53 GMT

Hello,

Please run:

$ gst-inspect-1.0 vpuenc_h264

Then look for bitrate options to see if vpuenc_264 supports bitrate options.

Best regards,

Salas.

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Tue, 20 May 2025 05:46:10 GMT

Factory Details:
Rank primary + 1 (257)
Long-name IMX VPU-based AVC/H264 video encoder
Klass Codec/Encoder/Video
Description Encode raw data to compressed video
Author Multimedia Team <shmmmw@freescale.com>
Plugin Details:
Name vpu
Description VPU video codec
Filename /usr/lib/gstreamer-1.0/libgstvpu.so
Version 4.6.3
License LGPL
Source module imx-gst1.0-plugin
Binary package Freescle Gstreamer Multimedia Plugins
Origin URL http://www.freescale.com
GObject
+----GInitiallyUnowned
+----GstObject
+----GstElement
+----GstVideoEncoder
+----vpuenc_h264
Implemented Interfaces:
GstPreset
Pad Templates:
SRC template: 'src'
Availability: Always
Capabilities:
video/x-h264
stream-format: { (string)avc, (string)byte-stream }
alignment: { (string)au, (string)nal }

SINK template: 'sink'
Availability: Always
Capabilities:
video/x-raw
format: { (string)NV12, (string)I420, (string)YUY2, (string)UYVY, (string)RGBA, (string)RGBx, (string)RGB16, (string)RGB15, (string)BGRA, (string)BGRx, (string)BGR16 }
width: [ 64, 1920 ]
height: [ 64, 1088 ]
framerate: [ 0/1, 2147483647/1 ]
Element has no clocking capabilities.
Element has no URI handling capabilities.
Pads:
SINK: 'sink'
Pad Template: 'sink'
SRC: 'src'
Pad Template: 'src'
Element Properties:
bitrate : set bit rate in kbps (0 for automatic)
flags: readable, writable
Unsigned Integer. Range: 0 - 2147483647 Default: 0
gop-size : How many frames a group-of-picture shall contain
flags: readable, writable
Unsigned Integer. Range: 0 - 32767 Default: 30
min-force-key-unit-interval: Minimum interval between force-keyunit requests in nanoseconds
flags: readable, writable
Unsigned Integer64. Range: 0 - 18446744073709551615 Default: 0
name : The name of the object
flags: readable, writable, 0x2000
String. Default: "vpuenc_h264-0"
parent : The parent of the object
flags: readable, writable, 0x2000
Object of type "GstObject"
qos : Handle Quality-of-Service events from downstream
flags: readable, writable
Boolean. Default: false
quant : set quant value: H.264(0-51) (-1 for automatic)
flags: readable, writable
Integer. Range: -1 - 51 Default: -1

There is option -bitrate, there is no option -max-bitrate

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Tue, 20 May 2025 06:11:59 GMT

Factory Details:
Rank primary + 1 (257)
Long-name IMX VPU-based AVC/H264 video encoder
Klass Codec/Encoder/Video
Description Encode raw data to compressed video
Author Multimedia Team <shmmmw@freescale.com>
Plugin Details:
Name vpu
Description VPU video codec
Filename /usr/lib/gstreamer-1.0/libgstvpu.so
Version 4.6.3
License LGPL
Source module imx-gst1.0-plugin
Binary package Freescle Gstreamer Multimedia Plugins
Origin URL http://www.freescale.com
GObject
+----GInitiallyUnowned
+----GstObject
+----GstElement
+----GstVideoEncoder
+----vpuenc_h264
Implemented Interfaces:
GstPreset
Pad Templates:
SRC template: 'src'
Availability: Always
Capabilities:
video/x-h264
stream-format: { (string)avc, (string)byte-stream }
alignment: { (string)au, (string)nal }

SINK template: 'sink'
Availability: Always
Capabilities:
video/x-raw
format: { (string)NV12, (string)I420, (string)YUY2, (string)UYVY, (string)RGBA, (string)RGBx, (string)RGB16, (string)RGB15, (string)BGRA, (string)BGRx, (string)BGR16 }
width: [ 64, 1920 ]
height: [ 64, 1088 ]
framerate: [ 0/1, 2147483647/1 ]
Element has no clocking capabilities.
Element has no URI handling capabilities.
Pads:
SINK: 'sink'
Pad Template: 'sink'
SRC: 'src'
Pad Template: 'src'
Element Properties:
bitrate : set bit rate in kbps (0 for automatic)
flags: readable, writable
Unsigned Integer. Range: 0 - 2147483647 Default: 0
gop-size : How many frames a group-of-picture shall contain
flags: readable, writable
Unsigned Integer. Range: 0 - 32767 Default: 30
min-force-key-unit-interval: Minimum interval between force-keyunit requests in nanoseconds
flags: readable, writable
Unsigned Integer64. Range: 0 - 18446744073709551615 Default: 0
name : The name of the object
flags: readable, writable, 0x2000
String. Default: "vpuenc_h264-0"
parent : The parent of the object
flags: readable, writable, 0x2000
Object of type "GstObject"
qos : Handle Quality-of-Service events from downstream
flags: readable, writable
Boolean. Default: false
quant : set quant value: H.264(0-51) (-1 for automatic)
flags: readable, writable
Integer. Range: -1 - 51 Default: -1

There is option -bitrate, no option max-bitrate

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Tue, 20 May 2025 06:13:38 GMT

Have check already, there is option -bitrate, no option -max-bitrate

Factory Details:
Rank primary + 1 (257)
Long-name IMX VPU-based AVC/H264 video encoder
Klass Codec/Encoder/Video
Description Encode raw data to compressed video
Author Multimedia Team <shmmmw@freescale.com>
Plugin Details:
Name vpu
Description VPU video codec
Filename /usr/lib/gstreamer-1.0/libgstvpu.so
Version 4.6.3
License LGPL
Source module imx-gst1.0-plugin
Binary package Freescle Gstreamer Multimedia Plugins
Origin URL http://www.freescale.com
GObject
+----GInitiallyUnowned
+----GstObject
+----GstElement
+----GstVideoEncoder
+----vpuenc_h264
Implemented Interfaces:
GstPreset
Pad Templates:
SRC template: 'src'
Availability: Always
Capabilities:
video/x-h264
stream-format: { (string)avc, (string)byte-stream }
alignment: { (string)au, (string)nal }

SINK template: 'sink'
Availability: Always
Capabilities:
video/x-raw
format: { (string)NV12, (string)I420, (string)YUY2, (string)UYVY, (string)RGBA, (string)RGBx, (string)RGB16, (string)RGB15, (string)BGRA, (string)BGRx, (string)BGR16 }
width: [ 64, 1920 ]
height: [ 64, 1088 ]
framerate: [ 0/1, 2147483647/1 ]
Element has no clocking capabilities.
Element has no URI handling capabilities.
Pads:
SINK: 'sink'
Pad Template: 'sink'
SRC: 'src'
Pad Template: 'src'
Element Properties:
bitrate : set bit rate in kbps (0 for automatic)
flags: readable, writable
Unsigned Integer. Range: 0 - 2147483647 Default: 0
gop-size : How many frames a group-of-picture shall contain
flags: readable, writable
Unsigned Integer. Range: 0 - 32767 Default: 30
min-force-key-unit-interval: Minimum interval between force-keyunit requests in nanoseconds
flags: readable, writable
Unsigned Integer64. Range: 0 - 18446744073709551615 Default: 0
name : The name of the object
flags: readable, writable, 0x2000
String. Default: "vpuenc_h264-0"
parent : The parent of the object
flags: readable, writable, 0x2000
Object of type "GstObject"
qos : Handle Quality-of-Service events from downstream
flags: readable, writable
Boolean. Default: false
quant : set quant value: H.264(0-51) (-1 for automatic)
flags: readable, writable
Integer. Range: -1 - 51 Default: -1

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Tue, 20 May 2025 06:15:25 GMT

Checked,
There is option -bitrate (CBR)
There is no option -max-bitrate

Re: Set VBR with bitrate limit IMX8MM

DR_Akzhol — Tue, 20 May 2025 06:20:36 GMT

Plugin Details:
Name vpu
Description VPU video codec
Filename /usr/lib/gstreamer-1.0/libgstvpu.so
Version 4.6.3
License LGPL
Source module imx-gst1.0-plugin
Binary package Freescle Gstreamer Multimedia Plugins
Origin URL http://www.freescale.com

Element Properties:
bitrate : set bit rate in kbps (0 for automatic)
flags: readable, writable
Unsigned Integer. Range: 0 - 2147483647 Default: 0
gop-size : How many frames a group-of-picture shall contain
flags: readable, writable
Unsigned Integer. Range: 0 - 32767 Default: 30
min-force-key-unit-interval: Minimum interval between force-keyunit requests in nanoseconds
flags: readable, writable
Unsigned Integer64. Range: 0 - 18446744073709551615 Default: 0
name : The name of the object
flags: readable, writable, 0x2000
String. Default: "vpuenc_h264-0"
parent : The parent of the object
flags: readable, writable, 0x2000
Object of type "GstObject"
qos : Handle Quality-of-Service events from downstream
flags: readable, writable
Boolean. Default: false
quant : set quant value: H.264(0-51) (-1 for automatic)
flags: readable, writable
Integer. Range: -1 - 51 Default: -1