tsunghanlin

MP4 TO MP4 (MEDIUM)
ffmpeg -i input.mp4 -b 1000000 output.mp4

M2TS TO MP4
ffmpeg -i input.m2ts -vcodec libx264 -crf 20 -acodec ac3 -vf "yadif" output.mp4

MP4 TO WEBM (HIGH)
ffmpeg -i input.mp4 -aq 5 -ac 2 -qmax 25 -threads 2 output.webm
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus output.webm

tsunghanlin

https://lists.gnu.org/archive/html/qemu-devel/2012-03/msg03390.html

Two major issues with this procedure:

1. When using kvm, a soft breakpoint (as set by 'b') will inject a trap
instruction into the guest image - which is not yet loaded after the
bios ran. You need to use a hardware breakpoint in this case.

2. Due to gdb limitations, you cannot switch between 16/32-bit mode (the
CPU starts in 16 bit) and the 64-bit mode of kernel within the same gdb

tsunghanlin

• https://blog.csdn.net/Richard_LiuJH/article/details/46758073
• https://blog.csdn.net/richard_liujh/article/details/45669207

tsunghanlin

site: https://github.com/google/syzkaller

= How To Start = Environment Setup

• https://github.com/google/syzkaller/blob/master/docs/setup.md
  • https://github.com/google/syzkaller/blob/master/docs/linux/setup.md
    • https://github.com/google/syzkaller/blob/master/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md

tsunghanlin

/etc/services && /System/Library/LaunchDaemons/ssh.plist

tsunghanlin

REF: https://superuser.com/questions/1005881/ssh-rootip-of-lxc-container-dont-work

iptables -t nat -A PREROUTING -i [host NIC] -p tcp --dport 2222 -j DNAT --to [container ip address]:22

tsunghanlin

Structure Note

• include/linux/skbuff.h: struct sk_buff
  • Timing of creation:
    • When applications pass data from socket
    • Packets arrive at NIC (dev_alloc_skb())
  • Contain real data's information and pointer to the real data
  • used by all the network layers
• when packet is passing UP through layers, old headers are not removed.

tsunghanlin

Debugging in uboot, especially after uboot relocated, can refer to:

• http://www.denx.de/wiki/view/DULG/DebuggingUBoot

For armv8 target, 'relocaddr' is stored in register x0 (arch/arm/lib/crt0_64.S:102)

$ aarch64-elf-gdb u-boot -x start.gdb 
GNU gdb (Linaro GDB 2015.08) 7.10.0.20151014-cvs
Copyright (C) 2015 Free Software Foundation, Inc.

tsunghanlin

ENTRY(_start)
SECTIONS
{
    . = 0x0;
    .ro : {
     *(.text)
     *(.rodata)
    }
    . = 0x00100000;
    .rw : {

tsunghanlin

PANDOC = pandoc
PANDOC_MD = doc.md
TEX_TEMPLATE = mincho.tex
PDF_FILE = em.pdf
PANDOC_OPTS += --highlight-style tango -N --toc
PANDOC_OPTS += --latex-engine=xelatex -H $(TEX_TEMPLATE)
PANDOC_OPTS += --filter pandoc-citeproc --csl ieee.csl --bibliography=ref.bib
# make citation number in article linkable
PANDOC_OPTS +=  --metadata link-citations=true
FONTS_OPTS  += --variable mainfont="Noto Sans CJK JP"