app.py

import logging
import shutil
import tempfile
import subprocess
from pathlib import Path
from moviepy.editor import VideoFileClip
import gradio as gr
import requests
from urllib.parse import urlparse
from ftplib import FTP

logging.basicConfig(level=logging.INFO)

def download_file(url, destination):
    """Downloads a file from a url to a destination."""
    response = requests.get(url)
    response.raise_for_status()
    with open(destination, 'wb') as f:
        f.write(response.content)

def get_input_path(video_file, video_url, temp_dir):
    """Returns the path to the video file, downloading it if necessary."""
    if video_file is not None:
        return Path(video_file.name)
    elif video_url:
        url_path = urlparse(video_url).path
        file_name = Path(url_path).name
        destination = temp_dir / file_name
        download_file(video_url, destination)
        return destination
    else:
        raise ValueError("No input was provided.")

def upload_to_ftp(server, username, password, source_file, destination_file):
    """Uploads a file to an FTP server."""
    with FTP(server, username, password) as ftp:
        with open(source_file, 'rb') as f:
            ftp.storbinary(f'STOR {destination_file}', f)


def get_output_path(input_path, temp_dir, res):
    """Returns the path to the output file, creating it if necessary."""
    output_path = temp_dir / (Path(input_path).stem + f"_{res}.m3u8")
    return output_path

def get_aspect_ratio(input_path, aspect_ratio):
    """Returns the aspect ratio of the video, calculating it if necessary."""
    if aspect_ratio is not None:
        return aspect_ratio
    video = VideoFileClip(str(input_path))
    return f"{video.size[0]}:{video.size[1]}"

def create_master_playlist(output_paths, temp_dir):
    """Creates a master playlist .m3u8 file that includes all other .m3u8 files."""
    master_playlist_path = temp_dir / "master_playlist.m3u8"
    with open(master_playlist_path, 'w') as f:
        f.write("#EXTM3U\n")
        for path in output_paths:
            f.write(f"#EXT-X-STREAM-INF:BANDWIDTH={1000*1000},RESOLUTION={path.stem.split('_')[-1]}\n")
            f.write(f"{path.name}\n")
    return master_playlist_path

def convert_video(video_file, quality, aspect_ratio, video_url):
    standard_resolutions = [4320, 2160, 1440, 1080, 720, 480, 360, 240, 144]  # 8K, 4K, 2K, Full HD, HD, SD in pixels

    with tempfile.TemporaryDirectory() as temp_dir:
        temp_dir = Path(temp_dir)
        input_path = get_input_path(video_file, video_url, temp_dir)

        aspect_ratio = get_aspect_ratio(input_path, aspect_ratio)

        video = VideoFileClip(str(input_path))
        original_height = video.size[1]

        output_paths = []  # Define output_paths as an empty list

        for res in standard_resolutions:
            # Skip if resolution is higher than original
            if res > original_height:
                continue

            scale = "-1:" + str(res)  # we scale the height to res and keep aspect ratio
            output_path = get_output_path(input_path, temp_dir, str(res) + 'p')  # pass the resolution to create a unique output file

            ffmpeg_command = [
                "ffmpeg", "-i", str(input_path), "-c:v", "libx264", "-crf", str(quality),
                "-vf", f"scale={scale}:force_original_aspect_ratio=decrease,pad=ceil(iw/2)*2:ceil(ih/2)*2,setsar={aspect_ratio}", 
                "-hls_time", "6",
                "-hls_playlist_type", "vod", "-f", "hls", str(output_path)
            ]

            try:
                result = subprocess.run(ffmpeg_command, check=True, timeout=600, capture_output=True, text=True)
            except subprocess.CalledProcessError as e:
                logging.error("ffmpeg command failed with the following error:\n%s", e.stderr)
                error_file_path = tempfile.gettempdir() + "/error.txt"
                with open(error_file_path, 'w') as error_file:
                    error_file.write("ffmpeg command failed with the following error:\n" + e.stderr)
                return error_file_path

            except subprocess.TimeoutExpired:
                logging.exception("ffmpeg command timed out.")
                return "ffmpeg command timed out."
            except FileNotFoundError:
                logging.exception("ffmpeg is not installed.")
                return "ffmpeg is not installed."
            except Exception as e:
                logging.exception("An error occurred.")
                return f"An error occurred: {str(e)}"

            output_paths.append(output_path)  # Append the output_path to output_paths

        if upload:
            ftp_files = []
            for path in [master_playlist_copy_path] + output_copy_paths:
                destination = ftp_path + "/" + path.name
                upload_to_ftp(ftp_server, ftp_username, ftp_password, path, destination)
                ftp_files.append(destination)
            return ftp_files
        else:
            return [master_playlist_copy_path] + output_copy_paths

        if not output_paths:
            return "The video is smaller than the smallest standard resolution."

        # Create master playlist
        master_playlist_path = create_master_playlist(output_paths, temp_dir)

        output_copy_paths = [shutil.copy2(path, tempfile.gettempdir()) for path in output_paths]
        master_playlist_copy_path = shutil.copy2(master_playlist_path, tempfile.gettempdir())

        return [master_playlist_copy_path] + output_copy_paths


def process_output(output):
    """Process output and display it appropriately."""
    if isinstance(output, str):
        # If output is a string, assume it's an error message and display it as text.
        return gr.outputs.Textbox()(output)
    elif isinstance(output, Path):
        # If output is a Path, assume it's an error file and provide it as a downloadable file.
        return gr.outputs.File()(str(output))
    elif isinstance(output, list):
        # If output is a list, assume it's a list of Paths or URLs and display it as a markdown list.
        return gr.outputs.Markdown()("\n".join(f"- {o}" for o in output))
    else:
        raise TypeError("Unexpected output type")

def main():
    video_file = gr.inputs.File(label="Video File")
    quality = gr.inputs.Dropdown(
        choices=["18", "23", "27", "28", "32"], label="Quality", default="27")
    aspect_ratio = gr.inputs.Dropdown(
        choices=["16:9",  "1:1", "4:3", "3:2", "5:4", "21:9", 
                 "1.85:1", "2.35:1", "3:1", "360", "9:16", "16:9", 
                 "2:1", "1:2", "9:1"], 
        label="Aspect Ratio", default="16:9") 
    video_url = gr.inputs.Textbox(label="Video URL")

    ftp_server = gr.inputs.Textbox(label="FTP Server")
    ftp_username = gr.inputs.Textbox(label="FTP Username")
    ftp_password = gr.inputs.Textbox(label="FTP Password", type="password")
    ftp_path = gr.inputs.Textbox(label="FTP Path")
    upload = gr.inputs.Checkbox(label="Upload to FTP server", default=False)

    gr.Interface(
        convert_video, 
        inputs=[video_file, quality, aspect_ratio, video_url, ftp_server, ftp_username, ftp_password, ftp_path, upload],
        outputs=gr.outputs.Textbox(),
        output_processor=process_output,
        allow_flagging=False, 
        live=False,
    ).launch()

if __name__ == "__main__":
    main()