RedditVideoMakerBot/video_creation/background.py

from pathlib import Path
import random
from random import randrange
from typing import Any, Tuple


from moviepy.editor import VideoFileClip
from moviepy.video.io.ffmpeg_tools import ffmpeg_extract_subclip
from pytube import YouTube
from pytube.cli import on_progress

from utils import settings
from utils.CONSTANTS import background_options
from utils.console import print_step, print_substep


def get_start_and_end_times(video_length: int, length_of_clip: int) -> Tuple[int, int]:
    """Generates a random interval of time to be used as the background of the video.

    Args:
        video_length (int): Length of the video
        length_of_clip (int): Length of the video to be used as the background

    Returns:
        tuple[int,int]: Start and end time of the randomized interval
    """
    random_time = randrange(180, int(length_of_clip) - int(video_length))
    return random_time, random_time + video_length


def get_background_config():
    """Fetch the background/s configuration"""
    try:
        choice = str(settings.config["settings"]["background"]["background_choice"]).casefold()
    except AttributeError:
        print_substep("No background selected. Picking random background'")
        choice = None

    # Handle default / not supported background using default option.
    # Default : pick random from supported background.
    if not choice or choice not in background_options:
        choice = random.choice(list(background_options.keys()))

    return background_options[choice]


def download_background(background_config: Tuple[str, str, str, Any]):
    """Downloads the background/s video from YouTube."""
    Path("./assets/backgrounds/").mkdir(parents=True, exist_ok=True)
    # note: make sure the file name doesn't include an - in it
    uri, filename, credit, _ = background_config
    if Path(f"assets/backgrounds/{credit}-{filename}").is_file():
        return
    print_step(
        "We need to download the backgrounds videos. they are fairly large but it's only done once. 😎"
    )
    print_substep("Downloading the backgrounds videos... please be patient 🙏 ")
    print_substep(f"Downloading {filename} from {uri}")
    YouTube(uri, on_progress_callback=on_progress).streams.filter(res="1080p").first().download(
        "assets/backgrounds", filename=f"{credit}-{filename}"
    )
    print_substep("Background video downloaded successfully! 🎉", style="bold green")


def chop_background_video(background_config: Tuple[str, str, str, Any], video_length: int):
    """Generates the background footage to be used in the video and writes it to assets/temp/background.mp4

    Args:
        background_config (Tuple[str, str, str, Any]) : Current background configuration
        video_length (int): Length of the clip where the background footage is to be taken out of
    """

    print_step("Finding a spot in the backgrounds video to chop...✂️")
    choice = f"{background_config[2]}-{background_config[1]}"

    background = VideoFileClip(f"assets/backgrounds/{choice}")

    start_time, end_time = get_start_and_end_times(video_length, background.duration)
    try:
        ffmpeg_extract_subclip(
            f"assets/backgrounds/{choice}",
            start_time,
            end_time,
            targetname="assets/temp/background.mp4",
        )
    except (OSError, IOError):  # ffmpeg issue see #348
        print_substep("FFMPEG issue. Trying again...")
        with VideoFileClip(f"assets/backgrounds/{choice}") as video:
            new = video.subclip(start_time, end_time)
            new.write_videofile("assets/temp/background.mp4")
    print_substep("Background video chopped successfully!", style="bold green")
    return background_config[2]