django-videoplayer

A Django and ES6 Javascript video player app.

Features at a glance

Lightweight, customisable wrapper around the video API;
Works around Chrome bugs where in certain circumstances requesting the video can result in a pending request which never resolves (see this bug report for example). One telltale sign of this is a "Waiting for available socket" message;
Sizes the video player based on the poster image, avoiding difficulties with determining video aspect ratio in responsive layouts;
Provides abstract models and a (Django or Jinja2 compatible) template snippet for an HTML5 video element and its associated sources; and
Supports a mobile version of each video source.

Requirements

Python 2.7, 3.4 or 3.5
Django 1.8+
Modernizr (setclasses, touchevents, pointerevents). [Download minimal build]
'no-js' class on the html element. [Modernizr docs]

Installation

pip install -e git+git@github.com:pbright/django-videoplayer.git#egg=django-videoplayer
Ensure that the TEMPLATES setting includes an entry with 'APP_DIRS': True, or copy templates/videoplayer/videoplayer.html to a location where django.template.loader.get_template can find it.
TODO: Webpack
TODO: Static files

How to Use

Import AbstractVideo and create a child model class. The child class must implement render_video, which will typically call the parent's render_video method passing it markup for a poster image via the poster_markup keyword argument. The size and aspect ratio of the video element is determined by the poster image.

The child model class can either define a source (and optionally a mobile_source) field, or a sources reverse lookup where the related model defines a source (and optionally a mobile_source) field. The later case is provided to support the video element having multiple source elements, and the abstract class AbstractVideoSource is provided for this purpose.

AbstractVideo provides:

Defaults for the following video element properties, which can be overridden by a field or attribute of the same name on the child class: autoplay, loop, controls, muted
A render_video method. See templating section below.

Example minimal implementation supporting only a single source:

from videoplayer.models import \
    AbstractVideo, validate_video_type, get_file_type

class TestVideo(AbstractVideo):
    img_height = models.PositiveSmallIntegerField(null=True, blank=True,
                                                  editable=False)
    img_width = models.PositiveSmallIntegerField(null=True, blank=True,
                                                 editable=False)
    poster_image = models.ImageField(upload_to=settings.UPLOAD_PATH,
                                     width_field='img_width',
                                     height_field='img_height')

    source = models.FileField(upload_to=settings.UPLOAD_PATH,
                              validators=[validate_video_type])
    mobile_source = models.FileField(upload_to=settings.UPLOAD_PATH,
                                     validators=[validate_video_type],
                                     blank=True, null=True)

    def render_video(self, **kwargs):
        poster_markup = '<img src="%s" height="%d" width="%d" />' % (
            self.poster_image.url, self.img_height, self.img_width)
        return super(TestVideo, self).render_video(
            poster_markup=poster_markup)

    def __str__(self):
        return str(self.source)

Example implementation overriding some defaults and supporting multiple sources:

from videoplayer.models import AbstractVideo, AbstractVideoSource

class TestVideo(AbstractVideo):
    img_height = models.PositiveSmallIntegerField(null=True, blank=True,
                                                  editable=False)
    img_width = models.PositiveSmallIntegerField(null=True, blank=True,
                                                 editable=False)
    poster_image = models.ImageField(upload_to=settings.UPLOAD_PATH,
                                     width_field='img_width',
                                     height_field='img_height')

    autoplay = models.BooleanField(default=True)
    loop = models.BooleanField(default=True)

    @property
    def muted(self):
        return not self.autoplay

    @property
    def controls(self):
        if self.autoplay and self.loop:
            return False
        return True

    def render_video(self, **kwargs):
        poster_markup = '<img src="%s" height="%d" width="%d" />' % (
          self.poster_image.url, self.img_height, self.img_width)
        return super(TestVideo, self).render_video(
            poster_markup=poster_markup)

    def __str__(self):
        return str(self.sources.first())

class VideoSource(AbstractVideoSource):
    video = models.ForeignKey(Video, related_name='sources')

To render the video, simple call render_video in your template.

Django example:

{{ video.render_video }}

Jinja2 example:

{{ video.render_video() }}

Lastly, amend your Javascript to instantiate a new VideoPlayer for each element with the class .video-player.

For example:

import {VideoPlayer} from './videoplayer/videoplayer';

for (let playerElement of document.body.getElementsByClassName('video-player')) {
  new VideoPlayer(playerElement);
}

TODO: replaceSrc and teardown explanation

TODO: Mobile style explanation, including hover

Options

Javascript

TODO

SCSS

Colors can be defined by the following variables:
$video-background (defaults to #000)
$video-controls-background (defaults to transparent)
$video-controls-color (defaults to #fff)
$video-controls-active-color (defaults to transparentize(#fff, .2))
$video-progress-track-background (defaults to $video-background)
$video-progress-thumb-color (defaults to $video-controls-color)

Responsive breakpoints can be defined by the following variables:
$tablet-max (defaults to 1280px)
$phone-max (defaults to 667px)

A number of mixins are defined in videoplayer.scss which can also be overridden on a case by case basis.

krishnaramg3/django-videoplayer