you-can-datamosh-on-Linux (and Apple Macintosh, see the notes at the bottom)
Hello, friends! If you have Python 3 and ffmpeg installed you can datamosh! If you don't have ffmpeg there are instructions for getting it here: http://ffmpeg.org/download.html
What's a datamosh?
Here's an example made by someone on the internet!
The mosh works out of the box and produces videos ready for social media sites like Twitter but I left extensive notes in the code to help you modify settings and understand what's happening.
How to run the datamosh program:
$ python3 do_the_mosh.py [video file name]
You can see command line options with:
$ python3 do_the_mosh.py --help
The datamoshed video will be in a new directory:
You can most easily contact me on twitter. I am @happyhorseskull there as well.
Good luck, friends!
Editing python files is really easy with a simple code editor like https://atom.io/
If your editing session gets wild and you're not sure how to fix the code you can always re-download it from this github page so fear not!
Here are the really important variables in
do_the_mosh.py for changing the video it creates:
start_sec: Time the video starts on original footage's timeline. Footage trimmed up to start_sec
end_sec: Time the video ends on original footage's timeline. Footage trimmed after end_sec
start_effect_sec: Time the effect starts on the trimmed footage's timeline.
end_effect_sec: Time the effect ends on the trimmed footage's timeline.
repeat_p_frames: If this is set to 0 the result will only contain i-frames. Possibly only a single i-frame.
GIF? GIF! with video_to_gif.py
Okay so MP4 files are fun and good but what about GIFs? That is easy with ffmpeg
$ ffmpeg -v error -i [video file name].mp4 [gif file name].gif
However the GIFs from that are kinda not that great so I adapted the information from http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html and made
video_to_gif.py for your high-quality GIF convenience! The command to use it is:
$ python3 video_to_gif.py [video file name]
Your new GIF will be in the
GIFs folder as
[original video file name].gif The GIF will only be datamoshed if you convert a datamoshed video.
video_to_gif.py will work with all sorts of regular, boring videos.
The current settings in
video_to_gif.py will copy the first 10 seconds of the video to the GIF. But it it easy to change that. You can either:
- run the file from the command line and specify the start time and end time:
$ python3 video_to_gif.py [video file name] 10 20which will start at the 10th second and end on the 20th second.
- you can edit
video_to_gif.pyand change the
end_gifvariables to be whichever default values you prefer.
GIFs can become suprisingly large files. If you need to make a GIF file size smaller you can make it shorter or you can edit some variables in
fps is frames per second. A lower
fps will create smaller files.
gif_width sets how wide the GIF is. The height will scale to match. A narrower width GIF will have a smaller file size.
video_to_gif.py will overwrite previous GIFs made from the same video file if you leave them in the GIFs directory.
Need videos to datamosh? Head over to Python's pip3 and install youtube-dl.
$ pip3 install youtube-dl # you may need to use sudo depending on your system.
Afterwards downloading youtube videos is as simple as:
$ youtube-dl --format 18 [youtube video url] -o youtube_video.mp4
But wait, there's more: youtube-dl works with lots of other sites like vimeo and can grab most twitter videos. To discover if a site is supported try:
$ youtube-dl --list-formats [website url]
which will show a list of available formats for the video on the page.
NOTE: If youtube-dl fails to download youtube videos try it on another site before deciding youtube-dl is broken. Sometimes youtube makes changes to its video player and it takes the youtube-dl team a few days to catch up.
The pip3 update command will get the most up-to-date version:
$ pip3 install update youtube-dl
Apple Macintosh notes
If your machine does not have Python 3 installed you can get it from Homebrew.
This page will help you with that http://docs.python-guide.org/en/latest/starting/install3/osx/#install3-osx
Then you can run it with:
$ py3 do_the_mosh.py
(If that doesn't work you may need to find where Py3 was installed with
$ which py3 or maybe
$ which python3)
Also you'll probably want to get ffmpeg from Homebrew if you don't have it already. Helpful instructions are available here https://trac.ffmpeg.org/wiki/CompilationGuide/MacOSX#ffmpegthroughHomebrew