技术

onnx relocation R_X86_64_TPOFF32 against hidden symbol

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export CMAKE_ARGS="-DONNX_USE_PROTOBUF_SHARED_LIBS=ON"
apt-get install libprotobuf-dev protobuf-compiler
pip install onnx -i https://pypi.tuna.tsinghua.edu.cn/simple

MacOs 3d presentation in VMWare

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Although VMWare can't support hardware accelerated 3d rendering for macos, I happened to see Garageband running in my old laptop, it indicates 'macOS Catalina (Version 10.15.4)' supports middle layer OpenGL software simulation, while up-to-date macOS deviates from this style.

Build GStreamer in Windows

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python -m pip install meson
python -m pip install ninja
 
git clone https://gitlab.freedesktop.org/gstreamer/gstreamer.git
cd gstreamer
 
rd /S /Q build
meson --buildtype=release -Dprefix=%CD%/installed -Dlibav=enabled -Dgst-plugins-ugly:x264=enabled -Dgst-plugins-bad:nvcodec=enabled build
 
meson compile -C build
 
meson install -C build

refer to:
https://gstreamer.freedesktop.org/documentation/installing/building-from-source-using-meson.html
http://dljz.nicethemes.cn/news/show-62582.html
https://blog.csdn.net/yuwg_le/article/details/126147636

Deep learning memo

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yolo pdf,

EfficientDet	https://arxiv.org/pdf/2011.08036.pdf
YOLOv1		https://arxiv.org/pdf/1506.02640.pdf
YOLOv2		https://arxiv.org/pdf/1612.08242.pdf
YOLOv3		https://arxiv.org/pdf/2011.08036.pdf
		https://pjreddie.com/media/files/papers/YOLOv3.pdf
YOLOv4		https://github.com/AlexeyAB/darknet
YOLOv4-Scaled	https://github.com/WongKinYiu/ScaledYOLOv4
YOLO-PPv2	https://arxiv.org/pdf/2104.10419.pdf
YOLOv5		https://arxiv.org/pdf/2104.10419.pdf
YOLOX		https://github.com/Megvii-BaseDetection/YOLOX
YOLOR		https://github.com/WongKinYiu/yolor
YOLOF		https://arxiv.org/pdf/2103.09460.pdf
YOLOS		https://arxiv.org/pdf/2106.00666.pdf
YOLOP		https://arxiv.org/pdf/2108.11250.pdf
YOLOV6		https://mp.weixin.qq.com/s/RrQCP4pTSwpTmSgvly9evg
		https://github.com/meituan/YOLOv6 
		https://zhuanlan.zhihu.com/p/353697121 
 
YOLOV7		https://arxiv.org/abs/2207.02696 
		https://github.com/WongKinYiu/yolov7

https://github.com/yael-vinker/CLIPasso
https://github.com/openai/CLIP

refer to:
AI有啥用
https://blog.csdn.net/PercentageC/article/details/126744534

Speed up pip install

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python3 -m pip install opencv-python==4.5.3.56 -i https://pypi.tuna.tsinghua.edu.cn/simple
 
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
 
http://mirrors.aliyun.com/pypi/simple/ 
https://pypi.mirrors.ustc.edu.cn/simple/ 
https://pypi.douban.com/simple/ 
https://pypi.tuna.tsinghua.edu.cn/simple/ 
http://pypi.mirrors.ustc.edu.cn/simple/

refer to:
https://www.cnblogs.com/huangguifeng/p/12002049.html

Chrome memo

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To prevent inactive tab from using cpu resources, in address bar, visit

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chrome://discards

toggle restless pages 'Urgent Discard' to grey under 'Actions' column.

chrome://flags#

enable-parallel-downloading
enable-force-dark

refer to:
https://www.askvg.com/tip-enable-tab-freeze-or-tab-suspend-feature-in-google-chrome/
https://blog.csdn.net/ythuiyi/article/details/113506238

Rendering mp4 video not silky, why?

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The original HD mp4 file 'movie.mp4' plays very smoothly. I picked out the h264 stream saved as 'movie.264' from it, then using mp4v2 converted 'movie.264' to a new mp4 file 'output.mp4'. However, experience of watching 'output.mp4' was very bad. Why?

I debugged the 'ClipTrack' function in 'mp4v2/test/OLD/mp4clip.cpp', found a key argument 'renderingOffset' of function 'MP4WriteSample'. All examples searched from the web about writing h264 to mp4 through mp4v2 set 'renderingOffset' to 0, while in 'ClipTrack', 'renderingOffset' of the function 'MP4WriteSample' is directly set to the value from 'renderingOffset' of the function 'MP4ReadSample'.

Here we make a concept clear, the 'sample' entity in mp4 file format specification is equal to a frame which can completely rendering as a picture. A sample consists of several nalus, a nalu whose start code is 0x00, 0x00, 0x00, 0x01 indicates a new sample, while a nalu which starts with 0x00, 0x00, 0x01 is among a sample, and a sample needs not to be a IDR key frame.

Through carrying 'renderingOffset' value at beginning of each sample in 'movie.264', I did generate an 'output.mp4' which displays as smoothly as the original one.

Did 'renderingOffset' mean time stamp of a sample? No, at least not exactly. By watching log, I found its value was not increasing as time went by.

I continued debugging mp4v2, then saw a key word 'ctts' atom, and searched a link from the web,

https://blog.csdn.net/cheyo809775692/article/details/100924523

I now understand, the decoding order of h264 samples is slightly different from the rendering order of them.

For example, in stts atom,

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'decoding order'	'sample count'		'sample duration'
1,2,3,4			4			20
5			1			40
6,7,8			3			20
9			1			60

in ctts atom,

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'decoding order'	'sample count'		'sample offset'
1,2,3			3			20
4			1			40
5			1			0
6			1			40
7			1			0
8			1			40
9			1			0

final rendering timing is

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'decoding order'	1	2	3	4	5	6	7	8	9
'duration'		20	20	20	20	40	20	20	20	60
'rending order'			1	2	3	5	5,4	7	6	9	9,8	9

Terms,

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mvhd: movie header
tkhd: track header
mdhd: media header
stsd: sample descriptions
stts: time to sample
ctts: composition offset
stss: sync sample offset
stsc: sample to chunk
stsz: sample size
stco/stco64: chunk offset
dts: decoding timestamp
pts: presentation timestamp

expect scp

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auto_scp()
{
	local filepath=$1
	expect -c "
		set timeout 10
 
		spawn scp scp://someone@192.168.12.3:1234//home/someone/$filepath .
 
		expect \"password:\" 
		send \"toodangerous\r\"
 
		interact
	"
}

refer to:
https://blog.csdn.net/f_zyj/article/details/93475830
https://zhuanlan.zhihu.com/p/25164676

Select Windows SDK version when building using cmake

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Read cmake online doc carefully, https://cmake.org/cmake/help/latest/variable/CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION.html

So when we build project which has CMakeLists.txt, we can select Windows SDK version in this way:

  1. In explorer, navigate to like C:\Program Files (x86)\Windows Kits\10\Include.
  2. For cmake always finds the newest version to build our project, we can just rename all sdk versions which is newer than we want. e.g. if we want 10.0.19041.0 to build our project, but 10.0.22581.0 is newer, we rename 10.0.22581.0 to 10.0.0.22581.0, the rule is among tokens split by period signs, the third token number is the key word that cmake sorts them to get the largest as newest.
  3. Start cmake to configure the project, it will find the right sdk version.
  4. After cmake is done in configuration, rename 10.0.0.22581.0 back to 10.0.22581.0.