app.py

import cv2
import tempfile
import streamlit as st
from prediction import smartcities

# Streamlit Interface
st.header("Smart City Cars and Bikes detection")
st.markdown("Upload a video or select the example")

## Select video to inference
file_video = str

f = st.file_uploader(" Upload a video ", type=["mp4"])
if f is not None:
    tfile = tempfile.NamedTemporaryFile(delete=False)
    tfile.write(f.read())
    file_video = tfile.name

if st.button("example"):
    file_video = "test_video.mp4"

## Process video
if file_video is not None:
    sc = smartcities()
    output = sc.predict(file_video)
    
    col1, col2 = st.columns(2)    
    if output is not None:
        with col1:
            st.subheader("Input: ")
            video = open(file_video, "rb")
            video_bytes = video.read()
            st.video(video_bytes, format="video/mp4")
        with col2:
            st.subheader("Output: ")
            output_video = open(output, "rb")
            output_bytes = output_video.read()
            st.video(output_bytes, format="video/mp4")
            st.download_button("Download", output_bytes, file_name="output_video.mp4", mime="video/mp4")