🌈 StreamJoy 😊¶

🔥 Enjoy animating!¶

Streamjoy turns your images into animations using sensible defaults for fun, hassle-free creation.

It cuts down the boilerplate and time to work on animations, and it's simple to start with just a few lines of code.

Install it with just pip to start, blazingly fast!

pip install streamjoy

Or, try out a basic web app version here:

https://huggingface.co/spaces/ahuang11/streamjoy

🛠️ Built-in features¶

🌐 Animate from URLs, files, and datasets
🎨 Render images with default or custom renderers
🎬 Provide context with a short intro splash
⏸ Add pauses at the beginning, end, or between frames
⚡ Execute read, render, and write in parallel
🔗 Connect multiple animations together

🚀 Quick start¶

🐤 Absolute basics¶

Stream from a list of images--local files work too!

from streamjoy import stream

if __name__ == "__main__":
    URL_FMT = "https://www.goes.noaa.gov/dimg/jma/fd/vis/{i}.gif"
    resources = [URL_FMT.format(i=i) for i in range(1, 11)]
    stream(resources, uri="goes.gif")  # .gif, .mp4, and .html supported

💅 Polish up¶

Specify a few more keywords to:

add an intro title and subtitle
adjust the pauses
optimize the GIF thru pygifsicle

from streamjoy import stream

if __name__ == "__main__":
    URL_FMT = "https://www.goes.noaa.gov/dimg/jma/fd/vis/{i}.gif"
    resources = [URL_FMT.format(i=i) for i in range(1, 11)]
    himawari_stream = stream(
        resources,
        uri="goes_custom.gif",
        intro_title="Himawari Visible",
        intro_subtitle="10 Hours Loop",
        intro_pause=1,
        ending_pause=1,
        optimize=True,
    )

👀 Preview inputs¶

If you'd like to preview the repr before writing, drop uri.

Output:

<AnyStream>
---
Output:
  max_frames: 50
  fps: 10
  display: True
  scratch_dir: streamjoy_scratch
  in_memory: False
---
Intro:
  intro_title: Himawari Visible
  intro_subtitle: 10 Hours Loop
  intro_watermark: made with streamjoy
  intro_pause: 1
  intro_background: black
---
Client:
  batch_size: 10
  processes: True
  threads_per_worker: None
---
Resources: (10 frames to stream)
  https://www.goes.noaa.gov/dimg/jma/fd/vis/1.gif
  ...
  https://www.goes.noaa.gov/dimg/jma/fd/vis/10.gif
---

Then, when ready, call the write method to save the animation!

himawari_stream.write()

🖇️ Connect streams¶

Connect multiple streams together to provide further context.

from streamjoy import stream, connect

URL_FMTS = {
    "visible": "https://www.goes.noaa.gov/dimg/jma/fd/vis/{i}.gif",
    "infrared": "https://www.goes.noaa.gov/dimg/jma/fd/rbtop/{i}.gif",
}

if __name__ == "__main__":
    visible_stream = stream(
        [URL_FMTS["visible"].format(i=i) for i in range(1, 11)],
        intro_title="Himawari Visible",
        intro_subtitle="10 Hours Loop",
    )
    infrared_stream = stream(
        [URL_FMTS["infrared"].format(i=i) for i in range(1, 11)],
        intro_title="Himawari Infrared",
        intro_subtitle="10 Hours Loop",
    )
    connect([visible_stream, infrared_stream], uri="goes_connected.gif")

📷 Render datasets¶

You can also render images directly from datasets, either through a custom renderer or a built-in one, and they'll also run in parallel!

The following example requires xarray, cartopy, matplotlib, and netcdf4.

pip install xarray cartopy matplotlib netcdf4

import numpy as np
import cartopy.crs as ccrs
import matplotlib.pyplot as plt
from streamjoy import stream, wrap_matplotlib

@wrap_matplotlib()
def plot(da, central_longitude, **plot_kwargs):
    time = da["time"].dt.strftime("%b %d %Y").values.item()
    projection = ccrs.Orthographic(central_longitude=central_longitude)
    subplot_kw = dict(projection=projection, facecolor="gray")
    fig, ax = plt.subplots(figsize=(6, 6), subplot_kw=subplot_kw)
    im = da.plot(ax=ax, transform=ccrs.PlateCarree(), add_colorbar=False, **plot_kwargs)
    ax.set_title(f"Sea Surface Temperature Anomaly\n{time}", loc="left", transform=ax.transAxes)
    ax.set_title("Source: NOAA OISST v2.1", loc="right", size=5, y=-0.01)
    ax.set_title("", loc="center")  # suppress default title
    plt.colorbar(im, ax=ax, label="°C", shrink=0.8)
    return fig

if __name__ == "__main__":
    url = (
      "https://www.ncei.noaa.gov/data/sea-surface-temperature-"
      "optimum-interpolation/v2.1/access/avhrr/201008/"
    )
    pattern = "oisst-avhrr-v02r01.*.nc"
    stream(
        url,
        uri="oisst.gif",
        pattern=pattern,  # GifStream.from_url kwargs
        max_files=30,
        renderer=plot,  # renderer related kwargs
        renderer_iterables=[np.linspace(-140, -150, 30)],  # iterables; central longitude per frame (30 frames)
        renderer_kwargs=dict(cmap="RdBu_r", vmin=-5, vmax=5),  # renderer kwargs
        # cmap="RdBu_r", # renderer_kwargs can also be propagated for convenience
        # vmin=-5,
        # vmax=5,
    )

Check out all the supported formats here or best practices here. (Or maybe you're interested in the design--here)

❤️ Made with considerable passion.

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