app.py

import os
import subprocess
from datetime import datetime

import gradio as gr


def video_to_audio_tab():
    def video_to_audio(video):
        output_file_name = "{datetime}.mp3".format(datetime=datetime.now().isoformat().replace(':', '-'))
        output = os.path.join("out_audio", output_file_name)

        command = "ffmpeg -loglevel quiet -i \"{video}\" -map a \"{output}\"".format(video=video, output=output)
        subprocess.call(command, shell=True)

        return output
    
    with gr.Tab("video2audio"):
        with gr.Row():
            video_input = gr.Video(label="Input video")
            with gr.Column():
                audio_output = gr.Audio(label="Output audio", type="filepath")
                video_to_audio_button = gr.Button(value="Extract audio", variant="primary")
                video_to_audio_button.click(video_to_audio, inputs=video_input, outputs=audio_output)

def audio_to_video_tab():
    def audio_to_video(audio, image):
        output_file_name = "{datetime}.mp4".format(datetime=datetime.now().isoformat().replace(':', '-'))
        output = os.path.join("out_video", output_file_name)

        # command = "ffmpeg -i \"{image}\" -i  \"{audio}\" \"{output}\"".format(image=image, audio=audio, output=output)
        command = "ffmpeg -loglevel quiet -loop 1 -i \"{image}\" -i  \"{audio}\" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest \"{output}\"".format(image=image, audio=audio, output=output)
        subprocess.call(command, shell=True)

        return output

    with gr.Tab("audio2video"):
        with gr.Row():
            with gr.Column():
                image_input = gr.Image(label="Input image", type="filepath")
                audio_input = gr.Audio(label="Input audio", type="filepath")
                
            with gr.Column():
                video_output = gr.Video(label="Output video")
                create_video_button = gr.Button(value="Merge audio with provided image", variant="primary")
                create_video_button.click(audio_to_video, inputs=[audio_input,image_input], outputs=video_output)

with gr.Blocks() as demo:
    video_to_audio_tab()
    audio_to_video_tab()

demo.launch()