Following is a snippet we used to remove a few seconds from a video using ffmpeg
ffmpeg -i 'input.mkv' -filter_complex \ "[0:v]trim=end=553,setpts=N/FRAME_RATE/TB[v0]; \ [0:a]atrim=end=553,asetpts=N/SR/TB[a0]; \ [0:v]trim=start=559,setpts=N/FRAME_RATE/TB[v1]; \ [0:a]atrim=start=559,asetpts=N/SR/TB[a1]; \ [v0][a0][v1][a1]concat=n=2:v=1:a=1[v][a]" \ -map "[v]" -map "[a]" 'output.mkv'
Specifically, we removed the seconds 09:13 (second 553) to 09:19 (second 559).
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 "${FILE%.mp4}.ns.mp4";' _ '{}' \;
For a single file, the command would be:
ffmpeg -i input.mp4 -c copy -an output.mp4
First install gif.ski using snap.
snap install gifski;
Then use ffmpeg to break down your video to frames:
ffmpeg -i video.mp4 frame%05d.png;
Finally use gif.ski to create your gif from the frames:
gifski -o clip.gif frame*.png;
Delete the frames if you do not need them, they will be taking a lot of space.
Below are the commands to build vid.stab and ffmpeg on Ubuntu 20.04LTS. (We did not include libaom).
sudo apt-get install build-essential cmake nasm libx264-dev libx265-dev libnuma-dev libvpx-dev libfdk-aac-dev libmp3lame-dev libopus-dev libunistring-dev mkdir ~/ffmpeg_sources ~/ffmpeg_build ~/bin cd ~/ffmpeg_sources wget -O https://github.com/georgmartius/vid.stab/archive/master.zip unzip master.zip cd vid.stab-master cmake -DCMAKE_INSTALL_PREFIX:PATH=~/ffmpeg_build . make make install sudo apt-get update -qq && sudo apt-get -y install \ autoconf \ automake \ build-essential \ cmake \ git-core \ libass-dev \ libfreetype6-dev \ libgnutls28-dev \ libsdl2-dev \ libtool \ libva-dev \ libvdpau-dev \ libvorbis-dev \ libxcb1-dev \ libxcb-shm0-dev \ libxcb-xfixes0-dev \ pkg-config \ texinfo \ wget \ yasm \ zlib1g-dev wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \ tar xjvf ffmpeg-snapshot.tar.bz2 && \ cd ffmpeg && \ PATH="$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
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;
Using deshake filter for comparison.
ffmpeg -i input.mp4 -vf deshake output.deshake.mp4
The following command will create a video from two input files and place them side by side using the hstack filter.
ffmpeg -i left.mp4 -i right.mp4 -filter_complex hstack output.mp4;
More information on the hstack filter:
11.104 hstack Stack input videos horizontally. All streams must be of same pixel format and of same height. Note that this filter is faster than using overlay and pad filter to create same output. The filter accepts the following option: inputsSet number of input streams. Default is 2.shortestIf set to 1, force the output to terminate when the shortest input terminates. Default value is 0
You can use the vstack filter in case you want to place the one video above the other.
