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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

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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.

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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

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# To determine device tree model (dts/dtb) used by the linux kernel
cat /proc/device-tree/model 

# For example:
# root@nitrogen6x:~# cat /proc/device-tree/model 
# Freescale i.MX6 Quad SABRE Lite Board

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avconv -i input.mp4 -vf transpose=1 output.mp4

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In case you are having ldconfig error in Ubuntu 14.04.5 LTS related to Nvidia EGL use follow fixes

Error
---
/sbin/ldconfig.real: /usr/lib/nvidia-384/libEGL.so.1 is not a symbolic link
/sbin/ldconfig.real: /usr/lib32/nvidia-384/libEGL.so.1 is not a symbolic link

Fix
---
sudo mv /usr/lib/nvidia-384/libEGL.so.1 /usr/lib/nvidia-384/libEGL.so.1.org

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# 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:

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# Incase you are interested to find out docker short, full id, hostname and ip address 
# of the running container, execute following commands from inside of your container

# To find out docker container id (short form)
DOCKER_ID=`cat /etc/hostname`
echo $DOCKER_ID

# To find out docker container host name using /etc/hosts
HOST_NAME=`grep $DOCKER_ID /etc/hosts | sed 's/\s/\n/g' | tail -1`
# - grep: search for the line having docker id

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#
# Commands are tested on Ubuntu 14.04 
#

# Issue following command to verify which GCC version is installed
gcc --version
 --- OR --- 
g++ --version

gcc (Ubuntu 4.8.5-4ubuntu8~14.04.2) 4.8.5

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#
# Commands are tested on Ubuntu 14.04 
#

# Install the python3 as Ubuntu 14.04 comes with Python2
sudo apt-get update -y && \
sudo apt-get install python-pip python3 python3-pip

# Let's manage two versions