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"""
Video processing utilities for combining video, audio, and subtitles.
"""
import os
import shutil
import subprocess
from pathlib import Path
import tempfile
from src.utils.logger import get_logger
from config import OUTPUT_DIR, SUBTITLE_FONT_SIZE
logger = get_logger(__name__)
def combine_video_audio_subtitles(video_path, audio_path, srt_path, output_path=None):
"""
Combine video with translated audio and subtitles.
Args:
video_path (str): Path to the video file
audio_path (str): Path to the translated audio file
srt_path (str): Path to the subtitle file
output_path (str, optional): Path for the output video
Returns:
Path: Path to the output video
Raises:
Exception: If combining fails
"""
try:
video_path = Path(video_path)
audio_path = Path(audio_path)
srt_path = Path(srt_path)
# Generate output path if not provided
if output_path is None:
lang_code = srt_path.stem.split('_')[-1]
output_path = OUTPUT_DIR / f"{video_path.stem}_translated_{lang_code}.mp4"
else:
output_path = Path(output_path)
logger.info(f"Combining video, audio, and subtitles")
# Verify that all input files exist
if not video_path.exists():
raise FileNotFoundError(f"Video file does not exist: {video_path}")
if not audio_path.exists():
raise FileNotFoundError(f"Audio file does not exist: {audio_path}")
if not srt_path.exists():
raise FileNotFoundError(f"Subtitle file does not exist: {srt_path}")
logger.info(f"Input files verified: Video: {video_path.stat().st_size} bytes, "
f"Audio: {audio_path.stat().st_size} bytes, "
f"Subtitles: {srt_path.stat().st_size} bytes")
# Try different methods to combine
methods = [
combine_method_subtitles_filter,
combine_method_with_temp,
combine_method_no_subtitles
]
success = False
error_messages = []
for i, method in enumerate(methods):
try:
logger.info(f"Trying combination method {i+1}/{len(methods)}")
result = method(video_path, audio_path, srt_path, output_path)
if result and Path(result).exists() and Path(result).stat().st_size > 0:
success = True
output_path = result
logger.info(f"Combination method {i+1} succeeded")
break
else:
error_messages.append(f"Method {i+1} failed: Result file not valid")
except Exception as e:
error_message = f"Method {i+1} failed: {str(e)}"
logger.warning(error_message)
error_messages.append(error_message)
if not success:
error_message = f"All combination methods failed: {'; '.join(error_messages)}"
logger.error(error_message)
raise Exception(error_message)
logger.info(f"Successfully combined video, audio, and subtitles: {output_path}")
return output_path
except Exception as e:
logger.error(f"Combining failed: {str(e)}", exc_info=True)
raise Exception(f"Combining failed: {str(e)}")
def combine_method_subtitles_filter(video_path, audio_path, srt_path, output_path):
"""
Combine video, audio, and subtitles using ffmpeg with subtitle filter.
Args:
video_path (Path): Path to the video file
audio_path (Path): Path to the translated audio file
srt_path (Path): Path to the subtitle file
output_path (Path): Path for the output video
Returns:
Path: Path to the output video
"""
logger.info(f"Using subtitles filter method")
# Use ffmpeg to combine video, audio, and subtitles
cmd = [
'ffmpeg',
'-i', str(video_path), # Video input
'-i', str(audio_path), # Audio input
'-vf', f"subtitles={str(srt_path)}:force_style='FontSize={SUBTITLE_FONT_SIZE}'", # Subtitle filter
'-map', '0:v', # Map video from first input
'-map', '1:a', # Map audio from second input
'-c:v', 'libx264', # Video codec
'-c:a', 'aac', # Audio codec
'-strict', 'experimental',
'-b:a', '192k', # Audio bitrate
'-y', # Overwrite output
str(output_path)
]
logger.debug(f"Running command: {' '.join(cmd)}")
process = subprocess.run(cmd, capture_output=True, text=True)
if process.returncode != 0:
error_message = f"FFmpeg subtitles filter method failed: {process.stderr}"
logger.error(error_message)
raise Exception(error_message)
return output_path
def combine_method_with_temp(video_path, audio_path, srt_path, output_path):
"""
Combine video, audio, and subtitles using temporary files.
Args:
video_path (Path): Path to the video file
audio_path (Path): Path to the translated audio file
srt_path (Path): Path to the subtitle file
output_path (Path): Path for the output video
Returns:
Path: Path to the output video
"""
logger.info(f"Using temporary file method")
# Create temporary directory
temp_dir = Path(tempfile.mkdtemp(prefix="video_combine_", dir=OUTPUT_DIR / "temp"))
try:
# Step 1: Combine video with audio
temp_video_audio = temp_dir / "video_with_audio.mp4"
cmd1 = [
'ffmpeg',
'-i', str(video_path),
'-i', str(audio_path),
'-c:v', 'copy',
'-c:a', 'aac',
'-strict', 'experimental',
'-map', '0:v',
'-map', '1:a',
'-y',
str(temp_video_audio)
]
logger.debug(f"Running command (step 1): {' '.join(cmd1)}")
process1 = subprocess.run(cmd1, capture_output=True, text=True)
if process1.returncode != 0:
error_message = f"Step 1 failed: {process1.stderr}"
logger.error(error_message)
raise Exception(error_message)
# Step 2: Add subtitles to the combined video
cmd2 = [
'ffmpeg',
'-i', str(temp_video_audio),
'-vf', f"subtitles={str(srt_path)}:force_style='FontSize={SUBTITLE_FONT_SIZE}'",
'-c:a', 'copy',
'-y',
str(output_path)
]
logger.debug(f"Running command (step 2): {' '.join(cmd2)}")
process2 = subprocess.run(cmd2, capture_output=True, text=True)
if process2.returncode != 0:
error_message = f"Step 2 failed: {process2.stderr}"
logger.error(error_message)
raise Exception(error_message)
return output_path
finally:
# Clean up temporary directory
try:
shutil.rmtree(temp_dir)
logger.debug(f"Cleaned up temporary directory: {temp_dir}")
except Exception as e:
logger.warning(f"Failed to clean up temp directory: {str(e)}")
def combine_method_no_subtitles(video_path, audio_path, srt_path, output_path):
"""
Fallback method: Combine only video and audio without subtitles.
Args:
video_path (Path): Path to the video file
audio_path (Path): Path to the translated audio file
srt_path (Path): Path to the subtitle file (unused in this method)
output_path (Path): Path for the output video
Returns:
Path: Path to the output video
"""
logger.info(f"Using fallback method (no subtitles)")
# Just combine video and audio as fallback
cmd = [
'ffmpeg',
'-i', str(video_path),
'-i', str(audio_path),
'-c:v', 'copy',
'-c:a', 'aac',
'-strict', 'experimental',
'-map', '0:v',
'-map', '1:a',
'-y',
str(output_path)
]
logger.debug(f"Running command: {' '.join(cmd)}")
process = subprocess.run(cmd, capture_output=True, text=True)
if process.returncode != 0:
error_message = f"Fallback method failed: {process.stderr}"
logger.error(error_message)
raise Exception(error_message)
logger.warning("Video was combined without subtitles")
return output_path
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