Genio 1200-EVK
Note
Command operations and test results presented in this chapter are based on the IoT Yocto v22.1 and Genio 1200-EVK.
Video CODEC Device Tree Overlay
Because there is no MT8395 video codec driver in Linux mainline, we have to migrate the MediaTek proprietary video codec driver to IoT Yocto v22.2 and make it as a device tree overlay for the integration. (For how to download an image to Genio 1200-EVK, please refer to Flash Image to Boards.
Command to list the device tree overlay that supported on genio-1200-evk image:
$ genio-flash --list-dtbo
List of available DTBO:
- display-dp.dtbo
- panel-boe-ne135fbm.dtbo
- video.dtbo
Command to flash image with video.dtbo (to install vcodec and vcu drivers):
$ genio-flash --load-dtbo video.dtbo
AIoT Tools: v1.3.3
Yocto Image:
name: Rity Demo Image (rity-demo-image)
distro: Rity Demo Layer 22.2-release (rity-demo)
codename: kirkstone
machine: genio-1200-evk
overlays: ['video.dtbo']
Looking for MediaTek SoC matching USB device 0e8d:0003
...
After boot to home, check if the V4L2 video devices mount successfully:
ls -l /sys/class/video4linux/
total 0
lrwxrwxrwx 1 root root 0 May 3 21:05 video0 -> ../../devices/platform/soc/18000000.vdec/video4linux/video0
lrwxrwxrwx 1 root root 0 May 3 21:05 video1 -> ../../devices/platform/soc/1a020000.venc/video4linux/video1
lrwxrwxrwx 1 root root 0 May 3 21:05 video2 -> ../../devices/platform/soc/14001000.mdp_rdma0/video4linux/video2
Supported Formats of MDP
List Video Output formats:
v4l2-ctl -d2 --list-formats-out
ioctl: VIDIOC_ENUM_FMT
Type: Video Output Multiplanar
[0]: 'GREY' (8-bit Greyscale)
[1]: 'RGBR' (16-bit RGB 5-6-5 BE)
[2]: 'RGBP' (16-bit RGB 5-6-5)
[3]: 'RGB3' (24-bit RGB 8-8-8)
[4]: 'BGR3' (24-bit BGR 8-8-8)
[5]: 'AR24' (32-bit BGRA 8-8-8-8)
[6]: 'BA24' (32-bit ARGB 8-8-8-8)
[7]: 'UYVY' (UYVY 4:2:2)
[8]: 'VYUY' (VYUY 4:2:2)
[9]: 'YUYV' (YUYV 4:2:2)
[10]: 'YVYU' (YVYU 4:2:2)
[11]: 'YU12' (Planar YUV 4:2:0)
[12]: 'YV12' (Planar YVU 4:2:0)
[13]: 'NV12' (Y/CbCr 4:2:0)
[14]: 'NV21' (Y/CrCb 4:2:0)
[15]: 'NV16' (Y/CbCr 4:2:2)
[16]: 'NV61' (Y/CrCb 4:2:2)
[17]: 'MT21' (Mediatek Compressed Format, compressed)
[18]: 'MM21' (Mediatek 8-bit Block Format)
[19]: 'NM12' (Y/CbCr 4:2:0 (N-C))
[20]: 'NM21' (Y/CrCb 4:2:0 (N-C))
[21]: 'NM16' (Y/CbCr 4:2:2 (N-C))
[22]: 'NM61' (Y/CrCb 4:2:2 (N-C))
[23]: 'YM12' (Planar YUV 4:2:0 (N-C))
[24]: 'YM21' (Planar YVU 4:2:0 (N-C))
[25]: 'YM16' (Planar YUV 4:2:2 (N-C))
[26]: 'YM61' (Planar YVU 4:2:2 (N-C))
List Video Capture formats:
v4l2-ctl -d2 --list-formats
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture Multiplanar
[0]: 'GREY' (8-bit Greyscale)
[1]: 'RGBR' (16-bit RGB 5-6-5 BE)
[2]: 'RGBP' (16-bit RGB 5-6-5)
[3]: 'RGB3' (24-bit RGB 8-8-8)
[4]: 'BGR3' (24-bit BGR 8-8-8)
[5]: 'AR24' (32-bit BGRA 8-8-8-8)
[6]: 'BA24' (32-bit ARGB 8-8-8-8)
[7]: 'UYVY' (UYVY 4:2:2)
[8]: 'VYUY' (VYUY 4:2:2)
[9]: 'YUYV' (YUYV 4:2:2)
[10]: 'YVYU' (YVYU 4:2:2)
[11]: 'YU12' (Planar YUV 4:2:0)
[12]: 'YV12' (Planar YVU 4:2:0)
[13]: 'NV12' (Y/CbCr 4:2:0)
[14]: 'NV21' (Y/CrCb 4:2:0)
[15]: 'NV16' (Y/CbCr 4:2:2)
[16]: 'NV61' (Y/CrCb 4:2:2)
[17]: 'NM12' (Y/CbCr 4:2:0 (N-C))
[18]: 'NM21' (Y/CrCb 4:2:0 (N-C))
[19]: 'NM16' (Y/CbCr 4:2:2 (N-C))
[20]: 'NM61' (Y/CrCb 4:2:2 (N-C))
[21]: 'YM12' (Planar YUV 4:2:0 (N-C))
[22]: 'YM21' (Planar YVU 4:2:0 (N-C))
[23]: 'YM16' (Planar YUV 4:2:2 (N-C))
[24]: 'YM61' (Planar YVU 4:2:2 (N-C))
Micro Processor - System Companion Processor
On Genio 1200, the MDP kernel driver delegates most of the hardware configuration logic to a Micro Processor, which we called SCP (System Companion Processor). The MDP kernel driver communicate with SCP via Remote Processor Framework. All the video processing functionalities should be accessed through the V4L2 interface on IoT Yocto.
On IoT Yocto, the SCP firmware is loaded when first launched.
Video Decoder Codec Types
Codec |
Profile |
Max Level |
Max Bitrate |
Max Resolution |
|---|---|---|---|---|
MPEG-4 |
Advanced Simple |
L5 |
60Mbps |
1920x1080@60fps |
Simple |
L6 |
60Mbps |
1920x1080@60fps |
|
H.264 |
Constrained Baseline (CBP) |
L5.2 |
160Mbps |
3840x2160@90fps |
Main (MP) |
L5.2 |
160Mbps |
3840x2160@90fps |
|
High (HiP) |
L5.2 |
160Mbps |
3840x2160@90fps |
|
H.265(HEVC) |
Main |
L5.1 |
160Mbps |
3840x2160@90fps |
VP8 |
40Mbps |
1920x1080@60fps |
||
VP9 |
0/2 |
120Mbps |
3840x2160@90fps |
Note
While the mdp-capture （a v4l2 capture device, please refer to HDMI-RX） was opened, the video decoding capability might been slightly degraded due to the MDP HW limitation.
For example, It is okay to play four FHD videos at the same time with 60 frames per second, but when mdp-capture is in use, it becomes 55 frames per second.
Video Encoder Codec Types
Codec |
Input Format |
Profile |
Level |
Max Bitrate |
Record Spec |
|---|---|---|---|---|---|
H.264 |
NV12, NV21, YV12, YUV420(I420), RGBA8888, RGB888 |
Baseline Main High |
L5.2 |
100Mbps |
3840x2160@60fps |
H.265 |
NV12, NV21, YV12, YUV420(I420), RGBA8888, RGB888 |
Main |
L5.1 |
100Mbps |
3840x2160@60fps |
Video Codec Capabilities
On Genio-1200, the maximum instance number of VDEC is 16, and the maximum instance of VENC is 10. The maximum resolution/framerate of multiple instances might be calculated by SPEC listed in the following section. For example, the maximum spec of MPEG4 video decoding is FHD(1920x1080) 60fps. We might support two 1920x1080-30fps videos or eight 720x480-30fps videos. It is okay to run VDEC and VENC at the same time without any conflict.
Width |
Height |
FPS |
Instance |
Test result |
Note |
|---|---|---|---|---|---|
3840 |
2160 |
90 |
1 |
Pass |
|
3840 |
2160 |
30 |
3 |
Pass |
|
2560 |
1440 |
30 |
6 |
Pass |
|
1920 |
1080 |
30 |
8 |
Pass |
Performance mode |
1280 |
720 |
30 |
12 |
Pass |
Performance mode |
Width |
Height |
FPS |
Instance |
Test result |
Note |
|---|---|---|---|---|---|
3840 |
2160 |
60 |
1 |
Pass |
|
3840 |
2160 |
30 |
2 |
Pass |
|
2560 |
1440 |
30 |
4 |
Pass |
|
1920 |
1080 |
30 |
7 |
Pass |
|
1280 |
720 |
30 |
10 |
Pass |
Performance mode |
Note
The more instances, the more SW overhead(CPU / bandwidth / IO… etc) was generated. Leave some margins for the overheads.
Video Encoder Extra-Controls
As a V4L2 video encoder, mtk-vcodec-enc also provides extra-controls to set encoder capabilities.
Codec Controls
video_b_frames 0x009909ca (int) : min=0 max=3 step=1 default=0 value=0 flags=update
video_gop_size 0x009909cb (int) : min=0 max=65535 step=1 default=0 value=0
video_bitrate_mode 0x009909ce (menu) : min=0 max=2 default=0 value=0 (Variable Bitrate) flags=update
0: Variable Bitrate
1: Constant Bitrate
2: Constant Quality
video_bitrate 0x009909cf (int) : min=0 max=400000000 step=1 default=5000000 value=5000000
frame_level_rate_control_enable 0x009909d7 (bool) : default=1 value=1
sequence_header_mode 0x009909d8 (menu) : min=0 max=1 default=1 value=1 (Joined With 1st Frame)
0: Separate Buffer
1: Joined With 1st Frame
number_of_mbs_in_a_slice 0x009909dc (int) : min=0 max=65535 step=1 default=0 value=0
force_key_frame 0x009909e5 (button) : value=0 flags=write-only, execute-on-write
h264_maximum_qp_value 0x00990a62 (int) : min=0 max=51 step=1 default=51 value=51
h264_i_frame_period 0x00990a66 (int) : min=0 max=65535 step=1 default=0 value=0
h264_level 0x00990a67 (menu) : min=0 max=16 default=11 value=11 (4)
0: 1
1: 1b
2: 1.1
3: 1.2
4: 1.3
5: 2
6: 2.1
7: 2.2
8: 3
9: 3.1
10: 3.2
11: 4
12: 4.1
13: 4.2
14: 5
15: 5.1
16: 5.2
h264_profile 0x00990a6b (menu) : min=0 max=4 default=0 value=0 (Baseline)
0: Baseline
2: Main
4: High
video_encode_vui_sar_descriptio 0x00990a6e (u32) : min=0 max=4294967295 step=1 default=0 dims=[4] flags=write-only, has-payload
hevc_profile 0x00990b67 (menu) : min=0 max=0 default=0 value=0 (Main)
0: Main
hevc_level 0x00990b68 (menu) : min=0 max=8 default=5 value=5 (4)
0: 1
1: 2
2: 2.1
3: 3
4: 3.1
5: 4
6: 4.1
7: 5
8: 5.1
hevc_tier 0x00990b6a (menu) : min=0 max=1 default=0 value=0 (Main)
0: Main
1: High
video_encode_slice_loss_indicat 0x00990b84 (int) : min=0 max=1 step=1 default=0 value=0 flags=write-only
video_encode_color_description 0x00992007 (u32) : min=0 max=4294967295 step=1 default=0 dims=[18] flags=write-only, has-payload
video_encode_scenario 0x00992014 (int) : min=0 max=32 step=1 default=0 value=0 flags=write-only
video_encode_nonrefp 0x00992015 (int) : min=0 max=32 step=1 default=0 value=0 flags=write-only
video_encode_detect_framerate 0x00992016 (int) : min=0 max=32 step=1 default=0 value=0 flags=write-only
video_encode_operation_rate 0x00992018 (int) : min=0 max=2048 step=1 default=0 value=0 flags=write-only
video_encode_heif_grid_size 0x0099201b (int) : min=0 max=251660416 step=16 default=0 value=0 flags=write-only
i_frame_qp_value 0x0099201f (int) : min=0 max=51 step=1 default=51 value=0 flags=write-only
p_frame_qp_value 0x00992020 (int) : min=0 max=51 step=1 default=51 value=0 flags=write-only
b_frame_qp_value 0x00992021 (int) : min=0 max=51 step=1 default=51 value=0 flags=write-only
video_encode_tsvc 0x00992022 (u32) : min=0 max=15 step=1 default=0 dims=[2] flags=write-only, has-payload
video_encode_nonrefp 0x00992023 (int) : min=0 max=32 step=1 default=0 value=0 flags=write-only
video_encode_multi_ref 0x00992024 (u32) : min=0 max=65535 step=1 default=0 dims=[8] flags=write-only, has-payload
video_encode_max_qp 0x00992026 (int) : min=-1 max=51 step=1 default=51 value=0 flags=write-only
video_encode_min_qp 0x00992027 (int) : min=-1 max=51 step=1 default=0 value=0 flags=write-only
video_encode_ip_qp_delta 0x00992028 (int) : min=-1 max=51 step=1 default=4 value=0 flags=write-only
video_encode_qp_control_mode 0x00992029 (int) : min=0 max=8 step=1 default=0 value=0 flags=write-only
video_encode_frame_level_qp 0x0099202a (int) : min=-1 max=51 step=1 default=28 value=0 flags=write-only
encode_max_ltr_frames 0x0099202e (int) : min=0 max=3 step=1 default=0 value=0 flags=write-only
Note
GStreamer does not fully support video header mode V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE.
For example, to compress a H.264 main profile and level 4.1 video bitstream with 512kbps bitrate:
gst-launch-1.0 -v videotestsrc num-buffers=300 ! "video/x-raw,format=NV12, width=720, height=480, framerate=30/1" ! v4l2h264enc extra-controls="cid,video_gop_size=30,video_bitrate=512000,sequence_header_mode=1" ! "video/x-h264,level=(string)4.1,profile=main" ! h264parse ! mp4mux ! filesink location=/tmp/test-h264.mp4
...
Execution ended after 0:00:01.554987154
Setting pipeline to NULL ...
Freeing pipeline ...
Another example, to compress a H.265 main profile and level 4.1 video bitstream with 512kbps bitrate:
gst-launch-1.0 -v videotestsrc num-buffers=300 ! "video/x-raw,format=NV12, width=720, height=480, framerate=30/1" ! v4l2h265enc extra-controls="cid,video_gop_size=30,video_bitrate=512000,sequence_header_mode=1" ! "video/x-h265,level=(string)4.1,profile=main" ! h265parse ! mp4mux ! filesink location=/tmp/test-h265.mp4
...
Execution ended after 0:00:00.545208846
Setting pipeline to NULL ...
Freeing pipeline ...
Note
To modify profile & level, please set it via gst-caps. If set by extra-controls directly, The profile & level will be overridden during gst caps negotiation.