Gifgen: Simple High Quality GIF Encoding

gifgen

Simple high quality GIF encoding

If you've ever tried encoding GIFs with ffmpeg there's a good chance your results came out looking pretty bad. This is because GIFs are limited to a palette of 256 colours and ffmpeg just uses a generic palette to be able to cover a wide range of colours.

gifgen produces much better results by doing a 2-pass encode. The first pass generates a custom colour palette based on all of the pixels from each frame. The second pass encodes the GIF using this palette instead of the default one bundled with ffmpeg.

ffmpeg default:

gifgen:

Usage

$ gifgen -h
gifgen 1.2.0

Usage: gifgen [options] [input]

Options:
  -o   Output file [input.gif]
  -f   Frames per second [10]
  -s   Optimize for static background
  -v   Display verbose output from ffmpeg
  -w   Scale output with horizontal resolution
  -b   Begin the clip at a given timestamp (in seconds)
  -d   Duration in seconds of the resulting gif, can be combined with at

Examples:
  $ gifgen video.mp4
  $ gifgen -o demo.gif SCM_1457.mp4
  $ gifgen -sf 15 screencap.mov
  $ gifgen -sf 15 -w 320 screencap.mov

Begin at 3.5 seconds into the video, make the gif using the next 5.5 seconds
  $ gifgen -b 3.5 -d 5.5 screencap.mov

Installation

macOS

brew install lukechilds/tap/gifgen

Linux

Just clone this repo and either copy/symlink gifgen to your PATH or run the script directly with ./gifgen. Requires ffmpeg to be installed.

Windows

¯\_(ツ)_/¯

Credits

gifgen is pretty much just the information from this blog article wrapped up in a shell script. Full credit goes to the original author.

Author: lukechilds
Source Code: https://github.com/lukechilds/gifgen 
License: MIT License

#node #npm #gif 

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Gifgen: Simple High Quality GIF Encoding

gifgen

Simple high quality GIF encoding

If you've ever tried encoding GIFs with ffmpeg there's a good chance your results came out looking pretty bad. This is because GIFs are limited to a palette of 256 colours and ffmpeg just uses a generic palette to be able to cover a wide range of colours.

gifgen produces much better results by doing a 2-pass encode. The first pass generates a custom colour palette based on all of the pixels from each frame. The second pass encodes the GIF using this palette instead of the default one bundled with ffmpeg.

ffmpeg default:

gifgen:

Usage

$ gifgen -h
gifgen 1.2.0

Usage: gifgen [options] [input]

Options:
  -o   Output file [input.gif]
  -f   Frames per second [10]
  -s   Optimize for static background
  -v   Display verbose output from ffmpeg
  -w   Scale output with horizontal resolution
  -b   Begin the clip at a given timestamp (in seconds)
  -d   Duration in seconds of the resulting gif, can be combined with at

Examples:
  $ gifgen video.mp4
  $ gifgen -o demo.gif SCM_1457.mp4
  $ gifgen -sf 15 screencap.mov
  $ gifgen -sf 15 -w 320 screencap.mov

Begin at 3.5 seconds into the video, make the gif using the next 5.5 seconds
  $ gifgen -b 3.5 -d 5.5 screencap.mov

Installation

macOS

brew install lukechilds/tap/gifgen

Linux

Just clone this repo and either copy/symlink gifgen to your PATH or run the script directly with ./gifgen. Requires ffmpeg to be installed.

Windows

¯\_(ツ)_/¯

Credits

gifgen is pretty much just the information from this blog article wrapped up in a shell script. Full credit goes to the original author.

Author: lukechilds
Source Code: https://github.com/lukechilds/gifgen 
License: MIT License

#node #npm #gif 

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URL Encoding in HTML - HTML URL Encode Characters

HTML URL Encoding

Uniform Resource Locator or URL is used as the address of a document on the web. It can be composed of words, typically the Domain Name Server(DNS), or IP address. For example, https://data-flair.training/blogs/ is a URL.

The structure of this URL is as follows-

scheme://prefix.domain:port/path/filename

Here:

Scheme – Defines the internet service type, commonly http or https.

Prefix – Defines the domain prefix, www.

Domain – It defines the domain name of the internet, data-flair.training

Port – Defines the host’s port number, 80 is the default port number for http.

Path – Defines the path at the server.

Filename – It defines the name of the file or the document that is being displayed.

HTML URL Schemes

Some common URL schemes are-

• Http(HyperText Transfer Protocol) – Used for common web-pages. It is not encrypted.
• Https(Secure HyperText Transfer Protocol) – Used for secure web-pages. It is encrypted.
• ftp(File Transfer Protocol) – Used for downloading and uploading files.

HTML URL Encode Characters

URL encoding is the practice of translating characters within URL to ASCII so that they can be easily transmitted and get accepted by all the browsers present globally on the internet. The non-ASCII characters are shown with a percentage sign (%) followed by hexadecimal digits.

Hence, URL encoding basically involves replacing a character that does not start with ‘%’ followed by hexadecimal digits to the ASCII character set. For example, if you want to type a space in the URL, you write it as %20. $ is replaced by %24.

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