app.py

import gradio as gr
import os
from moviepy.editor import VideoFileClip, TextClip, CompositeVideoClip
import ffmpeg  # Make sure to install ffmpeg-python

def read_subtitle_file(subtitle_path):
    with open(subtitle_path, 'r', encoding='utf-8') as file:
        subtitle_content = file.read()
    return os.path.basename(subtitle_path), subtitle_content

def add_subtitle_to_video(input_video, subtitle_file, subtitle_language, soft_subtitle):
    subtitle_file_path = subtitle_file.replace(" ", "\\ ")
    video_input_stream = ffmpeg.input(input_video)
    subtitle_input_stream = ffmpeg.input(subtitle_file)
    input_video_name = os.path.splitext(os.path.basename(input_video))[0]
    output_video = f"/tmp/output-{input_video_name}.mp4"
    subtitle_track_title = os.path.splitext(os.path.basename(subtitle_file))[0]

        stream = ffmpeg.output(
            video_input_stream, subtitle_input_stream, output_video,
            **{"c": "copy", "c:s": "mov_text"},
            **{"metadata:s:s:0": f"language={subtitle_language}",
               "metadata:s:s:0": f"title={subtitle_track_title}"}
        )

    ffmpeg.run(stream, overwrite_output=True)
    return output_video

def video_demo(video, subtitle, subtitle_type, subtitle_language):
    if subtitle is not None:
        soft_subtitle = "Hard"
        processed_video_path = add_subtitle_to_video(video, subtitle, subtitle_language, soft_subtitle)
        return processed_video_path
    else:
        return video

with gr.Blocks() as demo:
    # Header and information
    gr.Markdown("<h1 style='text-align: center;'>Text to SRT Converter</h1>", unsafe_allow_html=True)
    gr.Markdown("<h3 style='text-align: center; color: #FF5733;'>⚠️ Note: The processing can take some time depending on the video length and size.</h3>", unsafe_allow_html=True)
    
    # Inputs section
    with gr.Row():
        with gr.Column(scale=1):
            video_input = gr.Video(label="Upload Video")
        with gr.Column(scale=1):
            subtitle_input = gr.File(label="Upload Subtitle File", file_types=[".srt", ".vtt"])
        with gr.Column(scale=1):
            subtitle_language_input = gr.Textbox(label="Subtitle Language (ISO 639-1, e.g., 'en')")
    
    # Submit button
    with gr.Row():
        submit_button = gr.Button("Process Video", elem_id="process_button")

    # Output video
    output_video = gr.Video(label="Processed Video", elem_id="output_video")

    # Button click action
    submit_button.click(fn=video_demo, inputs=[video_input, subtitle_input, subtitle_language_input], outputs=output_video)

    # Custom CSS to enhance visual appearance
    demo.style(
        '''
        <style>
            #process_button { background-color: #4CAF50; color: white; border: none; padding: 15px 32px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; border-radius: 8px; }
            #output_video { border: 2px solid #4CAF50; border-radius: 8px; }
            .gr-column { padding: 10px; }
            .gr-row { justify-content: center; margin-top: 20px; }
        </style>
        ''', 
        unsafe_allow_html=True
    )


if __name__ == "__main__":
    demo.launch()