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import streamlit as st
import cv2
import numpy as np
from pathlib import Path
import subprocess
import shutil
st.title("🎬 Live Preview + Shader + Logo App (GPU/CPU + Audio)")
# --- Uploads ---
video_file = st.file_uploader("Upload video", type=["mp4", "mov"])
logo_file = st.file_uploader("Upload logo PNG", type=["png"])
logo_size_option = st.selectbox("Logo size", [64, 128, 256])
# --- Shader toggle ---
shader_option = st.radio("Apply Shader?", ["Yes", "No"])
shader_code = """
def shader_frame(width, height, t):
x = np.linspace(0, 1, width)
y = np.linspace(0, 1, height)
xv, yv = np.meshgrid(x, y)
r = ((xv + 0.5*np.sin(t)) % 1.0 * 255).astype(np.uint8)
g = ((yv + 0.5*np.cos(t)) % 1.0 * 255).astype(np.uint8)
b = (0.5*255*np.ones_like(r)).astype(np.uint8)
frame = np.stack([b, g, r], axis=2)
return frame
"""
if shader_option == "Yes":
st.text_area("Current shader code", shader_code, height=200)
# --- Paths ---
video_path = Path("video.mp4")
if video_file:
video_path.write_bytes(video_file.getbuffer())
status_placeholder = st.empty()
# --- Shader generator ---
def shader_frame(width, height, t):
x = np.linspace(0, 1, width)
y = np.linspace(0, 1, height)
xv, yv = np.meshgrid(x, y)
r = ((xv + 0.5*np.sin(t)) % 1.0 * 255).astype(np.uint8)
g = ((yv + 0.5*np.cos(t)) % 1.0 * 255).astype(np.uint8)
b = (0.5*255*np.ones_like(r)).astype(np.uint8)
frame = np.stack([b, g, r], axis=2)
return frame
# --- Logo loader ---
logo = None
has_alpha = False
if logo_file:
logo_data = np.frombuffer(logo_file.read(), np.uint8)
logo = cv2.imdecode(logo_data, cv2.IMREAD_UNCHANGED)
has_alpha = logo.shape[2] == 4 if logo.ndim == 3 else False
st.text(f"Logo loaded, transparency: {'Yes' if has_alpha else 'No'}")
# Resize logo
lh, lw = logo.shape[:2]
scale = logo_size_option / max(lw, lh)
new_w = int(lw * scale)
new_h = int(lh * scale)
logo = cv2.resize(logo, (new_w, new_h), interpolation=cv2.INTER_AREA)
# --- Logo overlay ---
def overlay_logo(frame, logo, has_alpha):
height, width = frame.shape[:2]
lh, lw = logo.shape[:2]
y1, y2 = height - lh - 10, height - 10
x1, x2 = width - lw - 10, width - 10
if has_alpha:
alpha = logo[:, :, 3] / 255.0
for c in range(3):
frame[y1:y2, x1:x2, c] = (
alpha * logo[:, :, c] + (1 - alpha) * frame[y1:y2, x1:x2, c]
)
else:
frame[y1:y2, x1:x2] = logo[:, :, :3]
return frame
# --- GPU detection ---
def has_nvenc():
try:
result = subprocess.run(["ffmpeg", "-encoders"], capture_output=True, text=True)
return "h264_nvenc" in result.stdout
except Exception:
return False
# --- Preview generator ---
def generate_preview():
if not video_file:
status_placeholder.warning("Upload a video first!")
return
cap = cv2.VideoCapture(str(video_path))
fps = cap.get(cv2.CAP_PROP_FPS) or 30
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
total_frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
st.text(f"Preview resolution: {width} x {height} @ {fps:.1f} FPS")
tmp_out = Path("temp_frames.mp4")
out = cv2.VideoWriter(str(tmp_out),
cv2.VideoWriter_fourcc(*'mp4v'),
fps, (width, height))
t = 0.0
dt = 1.0 / fps
frame_idx = 0
preview_display = st.empty()
progress_bar = st.progress(0)
while True:
ret, frame = cap.read()
if not ret:
break
# Shader
if shader_option == "Yes":
shader = shader_frame(width, height, t)
blended = cv2.addWeighted(frame, 0.7, shader, 0.3, 0)
else:
blended = frame.copy()
# Logo
if logo is not None:
blended = overlay_logo(blended, logo, has_alpha)
out.write(blended)
# Live preview
preview_small = cv2.resize(blended, (width // 2, height // 2))
preview_display.image(preview_small, channels="BGR")
t += dt
frame_idx += 1
progress_bar.progress(min(frame_idx / max(total_frames, 1), 1.0))
cap.release()
out.release()
# --- Merge audio ---
output_path = Path("preview.mp4")
encoder = "h264_nvenc" if has_nvenc() else "libx264"
st.info(f"Encoding with: {encoder}")
cmd = [
"ffmpeg", "-y",
"-i", str(tmp_out),
"-i", str(video_path),
"-map", "0:v:0",
"-map", "1:a:0",
"-c:v", encoder,
"-preset", "fast",
"-b:v", "5M",
"-c:a", "aac",
str(output_path)
]
try:
subprocess.run(cmd, check=True)
st.success("✅ Preview generated successfully with audio!")
st.video(str(output_path))
st.markdown(f"[📥 Download preview](./{output_path})")
except subprocess.CalledProcessError as e:
st.error("❌ FFmpeg failed to merge audio.")
st.text(e)
# --- Buttons ---
if st.button("Generate Preview"):
generate_preview()
if st.button("Go Live"):
st.warning("Go Live is not implemented yet.")
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