aakbar5

Using FFMPEG
---
ffmpeg -i input.mp4 -s 320x240 -b 64k -vcodec mpeg1video -acodec copy output.mp4

Change parameters to get tradeoff quality and size
- Resolution via -s 320x240
- Bitrate via -b 64k


Using AVCONV

aakbar5

# To convert dts file into dtb 
<kernel-source>/scripts/dtc/dtc -I dts -O dtb <dts_file> -o <dtb_file>

# To convert dtb to dts
<kernel-source>/scripts/dtc/dtc -I dtb -O dts <dtb_file> -o <dts_file>

# Both of above commands are using dtc built with linux kernel source. 
# However you can also use dtc binary comes with ubuntu packages. For this you
# need to install following package:

aakbar5

# Script is interested to take 
# - a flag
# - an option which takes a parameter
arg_list=$(getopt -o bp: --long boolean,param: -- "$@")
eval set -- "$arg_list"
while [ $# -gt 0 ] ; do
  case "$1" in
    -b | --boolean)
      echo "Parameter @ flag"
      shift

aakbar5

[Desktop Entry]
Type=Application
Name=EclipseC++
GenericName=Eclipse
Comment=Eclipse for development
Exec=/path/to/eclipse
Icon=/path/to/icon.xpm
Terminal=false
MimeType=text/plain;
Categories=Development;IDE

aakbar5

Yocto build was showing a warning of "QA Issue: No GNU_HASH in the elf binary".
- The fix was to make sure that linker command line used by the respective application is using parameters used by Yocto build system.
- Just for information $(LDFLAGS) used by Yocto is having -Wl,--hash-style=gnu.

Ref: For inside of GNU_HASH: https://blogs.oracle.com/ali/entry/gnu_hash_elf_sections

aakbar5

inherit extrausers
EXTRA_USERS_PARAMS = "usermod -P hello root;"

- This sets the root password to "hello".
- These lines can be added into your core-image-base.bbappend file.

aakbar5

# Pre-built package (# Ubuntu 18.04.3 LTS)
sudo apt update
sudo apt install cppcheck


# Build from code
wget https://github.com/danmar/cppcheck/archive/2.1.tar.gz 
tar zxvf 2.1.tar.gz 
cd cppcheck-2.1 
mkdir build 

aakbar5

# Ubuntu 18.04.3 LTS
# Installation
sudo apt-get update
sudo apt-get install -y build-essential cmake git zlib1g-dev libncurses5-dev llvm-6.0-dev libclang-6.0-dev libclang-6.0-dev clang-6.0
git clone https://github.com/include-what-you-use/include-what-you-use.git iwyu.git
cd iwyu.git
git checkout clang_6.0
mkdir -p build
cd build
cmake -DIWYU_LLVM_ROOT_PATH=/usr/lib/llvm-6.0 ..

aakbar5

# A simple function which takes
# no parameters and returns nothing
function fun1() {
  echo "A simple function"
}

# A function which takes parameters
# and return nothing
function fun2() {
  echo "Fun:: Number of parameters:   ${#@}"

aakbar5

// A simple example of how dup2 can be used

const char* msg = "Text written by standard file descriptor\n";
int fd = open("dup2_test.txt", O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
write(fd, msg, strlen(msg));

/* Map stdout to our file */    
dup2(fd, STDOUT_FILENO);
printf("Text written by dup @ stdout file descriptor\n");
close(fd);