Just lighter things..

Each time you light your lighter,
your lighter gets lighter.
When your lighter gets too light,
it won’t light.


I can’t go because of the Corona Virus — an alternative

I can’t go because of the Corona Virus…

  • Whiny
  • Cranky
  • Cantankerous
  • Perverse
  • Boring
  • Weak
  • Feeble

I’ve sworn an oath of solitude til the blight is purged from these lands!

  • Heroic
  • Valiant
  • Powerful
  • They will assume you have a sword
  • Impossible to check if you really have a sword because of Corona Virus

ffmpeg: Remove audio from several videos while preserving quality

To create audio-less copies of all the .mp4 videos in a folder, execute the following:

find . -type f -name "*.mp4" -exec bash -c 'FILE="$1"; ffmpeg -i "${FILE}" -c copy -an "${FILE%.mp4}.ns.mp4";' _ '{}' \;

For a single file, the command would be:

ffmpeg -i input.mp4 -c copy -an output.mp4

Making high quality GIF from video in Ubuntu 20.04LTS

First install gif.ski using snap.

snap install gifski;

Then use ffmpeg to break down your video to frames:

ffmpeg -i video.mp4 frame%05d.png;

Finally use gif.ski to create your gif from the frames:

gifski -o clip.gif frame*.png;

Delete the frames if you do not need them, they will be taking a lot of space.


Compile ffmpeg with video stabilization (vidstab) support on Ubuntu 20.04 LTS

Below are the commands to build vid.stab and ffmpeg on Ubuntu 20.04LTS. (We did not include libaom).

sudo apt-get install build-essential cmake nasm libx264-dev libx265-dev libnuma-dev libvpx-dev libfdk-aac-dev libmp3lame-dev libopus-dev libunistring-dev
mkdir ~/ffmpeg_sources ~/ffmpeg_build ~/bin
cd ~/ffmpeg_sources
wget -O https://github.com/georgmartius/vid.stab/archive/master.zip
unzip master.zip
cd vid.stab-master
cmake -DCMAKE_INSTALL_PREFIX:PATH=~/ffmpeg_build .
make
make install
sudo apt-get update -qq && sudo apt-get -y install \
autoconf \
automake \
build-essential \
cmake \
git-core \
libass-dev \
libfreetype6-dev \
libgnutls28-dev \
libsdl2-dev \
libtool \
libva-dev \
libvdpau-dev \
libvorbis-dev \
libxcb1-dev \
libxcb-shm0-dev \
libxcb-xfixes0-dev \
pkg-config \
texinfo \
wget \
yasm \
zlib1g-dev
wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
tar xjvf ffmpeg-snapshot.tar.bz2 && \
cd ffmpeg && \
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
--prefix="$HOME/ffmpeg_build" \
--pkg-config-flags="--static" \
--extra-cflags="-I$HOME/ffmpeg_build/include" \
--extra-ldflags="-L$HOME/ffmpeg_build/lib" \
--extra-libs="-lpthread -lm" \
--bindir="$HOME/bin" \
--enable-gpl \
--enable-gnutls \
--disable-libaom \
--enable-libass \
--enable-libfdk-aac \
--enable-libfreetype \
--enable-libmp3lame \
--enable-libopus \
--enable-libvorbis \
--enable-libvpx \
--enable-libx264 \
--enable-libx265 \
--enable-nonfree \
--enable-libvidstab && \
PATH="$HOME/bin:$PATH" make && \
make install && \
hash -r
source ~/.profile

https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

Using vid.stab with default parameters and two step process.

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/ffmpeg_build/lib
ffmpeg -i input.mp4 -vf vidstabdetect -f null -;
ffmpeg -i input.mp4 -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 output.vid.stab.mp4;

https://github.com/georgmartius/vid.stab#usage-instructions

Using deshake filter for comparison.

ffmpeg -i input.mp4 -vf deshake output.deshake.mp4

https://ffmpeg.org/ffmpeg-filters.html#deshake