From 1f0c9c44b3ca08499d7cde1477414d473a7a6558 Mon Sep 17 00:00:00 2001
From: LUIS NOVO <lfnovo@gmail.com>
Date: Mon, 28 Oct 2024 16:32:20 -0300
Subject: [PATCH] reorg content

---
 .../graphs/content_processing/video.py        | 140 ++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 open_notebook/graphs/content_processing/video.py

diff --git a/open_notebook/graphs/content_processing/video.py b/open_notebook/graphs/content_processing/video.py
new file mode 100644
index 0000000..acd23e4
--- /dev/null
+++ b/open_notebook/graphs/content_processing/video.py
@@ -0,0 +1,140 @@
+import json
+import os
+import subprocess
+
+from loguru import logger
+
+from open_notebook.graphs.content_processing.state import SourceState
+
+
+def extract_audio_from_video(input_file, output_file, stream_index):
+    """
+    Extract the specified audio stream to MP3 format
+    """
+    try:
+        cmd = [
+            "ffmpeg",
+            "-i",
+            input_file,
+            "-map",
+            f"0:a:{stream_index}",  # Select specific audio stream
+            "-codec:a",
+            "libmp3lame",  # Use MP3 codec
+            "-q:a",
+            "2",  # High quality setting
+            "-y",  # Overwrite output file if exists
+            output_file,
+        ]
+
+        result = subprocess.run(cmd, capture_output=True, text=True)
+        if result.returncode != 0:
+            raise Exception(f"FFmpeg failed: {result.stderr}")
+
+        return True
+
+    except Exception as e:
+        print(f"Error extracting audio: {str(e)}")
+        return False
+
+
+def get_audio_streams(input_file):
+    """
+    Analyze video file and return information about all audio streams
+    """
+    logger.debug(f"Analyzing video file {input_file} for audio streams")
+    try:
+        # Get stream information in JSON format
+        cmd = [
+            "ffprobe",
+            "-v",
+            "quiet",
+            "-print_format",
+            "json",
+            "-show_streams",
+            "-select_streams",
+            "a",
+            input_file,
+        ]
+
+        result = subprocess.run(cmd, capture_output=True, text=True)
+        if result.returncode != 0:
+            raise Exception(f"FFprobe failed: {result.stderr}")
+
+        data = json.loads(result.stdout)
+        return data.get("streams", [])
+
+    except Exception as e:
+        print(f"Error analyzing file: {str(e)}")
+        return []
+
+
+def select_best_audio_stream(streams):
+    """
+    Select the best audio stream based on various quality metrics
+    """
+    if not streams:
+        logger.debug("No audio streams found")
+        return None
+    else:
+        logger.debug(f"Found {len(streams)} audio streams")
+
+    # Score each stream based on various factors
+    scored_streams = []
+    for stream in streams:
+        score = 0
+
+        # Prefer higher bit rates
+        bit_rate = stream.get("bit_rate")
+        if bit_rate:
+            score += int(int(bit_rate) / 1000000)  # Convert to Mbps and ensure int
+
+        # Prefer more channels (stereo over mono)
+        channels = stream.get("channels", 0)
+        score += channels * 10
+
+        # Prefer higher sample rates
+        sample_rate = stream.get("sample_rate", "0")
+        score += int(int(sample_rate) / 48000)
+
+        scored_streams.append((score, stream))
+
+    # Return the stream with highest score
+    return max(scored_streams, key=lambda x: x[0])[1]
+
+
+def extract_best_audio_from_video(data: SourceState):
+    """
+    Main function to extract the best audio stream from a video file
+    """
+    input_file = data.get("file_path")
+    assert input_file is not None, "Input file path must be provided"
+    if not os.path.exists(input_file):
+        logger.critical(f"Input file not found: {input_file}")
+        return False
+
+    base_name = os.path.splitext(input_file)[0]
+    output_file = f"{base_name}_audio.mp3"
+
+    # Get all audio streams
+    streams = get_audio_streams(input_file)
+    if not streams:
+        logger.debug("No audio streams found in the file")
+        return False
+
+    # Select best stream
+    best_stream = select_best_audio_stream(streams)
+    if not best_stream:
+        logger.error("Could not determine best audio stream")
+        return False
+
+    # Extract the selected stream
+    stream_index = streams.index(best_stream)
+    success = extract_audio_from_video(input_file, output_file, stream_index)
+
+    if success:
+        logger.debug(f"Successfully extracted audio to: {output_file}")
+        logger.debug(f"- Channels: {best_stream.get('channels', 'unknown')}")
+        logger.debug(f"- Sample rate: {best_stream.get('sample_rate', 'unknown')} Hz")
+        logger.debug(f"- Bit rate: {best_stream.get('bit_rate', 'unknown')} bits/s")
+
+    return {"file_path": output_file, "identified_type": "audio/mp3"}