Python bindings for WebP
Project description
Installation
pip install webp
Requirements
libwebp (tested with v1.0.0)
Install libwebpmux and libwebpdemux components as well.
Check out the Dockerfile for steps to build from source on Ubuntu.
Python 3 (tested with v3.6)
cffi (tested with 1.10.0)
Pillow (tested with v4.1.1)
numpy (tested with v1.12.1)
Usage
import webp
Simple API
# Save an image
webp.save_image(img, 'image.webp', quality=80)
# Load an image
img = webp.load_image('image.webp', 'RGBA')
# Save an animation
webp.save_images(imgs, 'anim.webp', fps=10, lossless=True)
# Load an animation
imgs = webp.load_images('anim.webp', 'RGB', fps=10)
Advanced API
# Encode a PIL image to WebP in memory, with encoder hints
pic = webp.WebPPicture.from_pil(img)
config = WebPConfig.new(preset=webp.WebPPreset.PHOTO, quality=70)
buf = pic.encode(config).buffer()
# Read a WebP file and decode to a BGR numpy array
with open('image.webp', 'rb') as f:
webp_data = webp.WebPData.from_buffer(f.read())
arr = webp_data.decode(color_mode=WebPColorMode.BGR)
# Save an animation
enc = webp.WebPAnimEncoder.new(width, height)
timestamp_ms = 0
for img in imgs:
pic = webp.WebPPicture.from_pil(img)
enc.encode_frame(pic, timestamp_ms)
timestamp_ms += 250
anim_data = enc.assemble(timestamp_ms)
with open('anim.webp', 'wb') as f:
f.write(anim_data.buffer())
# Load an animation
with open('anim.webp', 'rb') as f:
webp_data = webp.WebPData.from_buffer(f.read())
dec = webp.WebPAnimDecoder.new(webp_data)
for arr, timestamp_ms in dec.frames():
# `arr` contains decoded pixels for the frame
# `timestamp_ms` contains the _end_ time of the frame
pass
Features
Picture encoding/decoding
Animation encoding/decoding
Automatic memory management
Simple API for working with PIL.Image objects
Not implemented
Encoding/decoding still images in YUV color mode
Advanced muxing/demuxing (color profiles, etc.)
Expose all useful fields
Developer notes
Running tests
The CircleCI local CLI should be used to run tests in an isolated environment:
$ circleci local execute
Known issues
An animation where all frames are identical will “collapse” in on itself, resulting in a single frame. Unfortunately, WebP seems to discard timestamp information in this case, which breaks webp.load_images when the FPS is specified.
Project details
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