能否用Python等工具从直播HLS M3U8电台流提取EXTINF歌曲信息？

Absolutely! You can absolutely automate grabbing and saving song titles from HLS M3U8 radio streams whenever tracks switch. Here's a straightforward approach using Python, tailored to your needs:

How It Works #

HLS radio streams rely on M3U8 playlists that often include #EXTINF tags with track metadata (artist, song title, etc.). We'll periodically fetch this playlist, parse the EXTINF line, and save the title to a file whenever it changes from the last track we recorded.

Step-by-Step Implementation #

1. Install Required Dependencies #

First, make sure you have requests installed for fetching the playlist:

pip install requests

2. Python Script to Automate Extraction #

This script will poll the M3U8 URL, check for track changes, and save new titles to a text file:

import time
import requests

# Configure these values based on your radio stream
M3U8_URL = "https://your-radio-stream-url/playlist.m3u8"
CHECK_INTERVAL = 30  # Seconds between checks (adjust as needed)
OUTPUT_FILE = "song_history.txt"

def get_current_song():
    try:
        response = requests.get(M3U8_URL, timeout=10)
        response.raise_for_status()  # Raise error for HTTP issues
        
        # Parse the EXTINF line (format: #EXTINF:-1,Artist - Song Title)
        for line in response.text.splitlines():
            if line.startswith("#EXTINF"):
                # Extract everything after the comma
                return line.split(",", 1)[1].strip()
        return None
    except Exception as e:
        print(f"Error fetching stream data: {e}")
        return None

def main():
    last_song = None
    print(f"Monitoring stream for track changes... (checking every {CHECK_INTERVAL}s)")
    
    while True:
        current_song = get_current_song()
        
        if current_song and current_song != last_song:
            print(f"New track detected: {current_song}")
            # Append to output file
            with open(OUTPUT_FILE, "a", encoding="utf-8") as f:
                f.write(f"{current_song}\n")
            last_song = current_song
        
        time.sleep(CHECK_INTERVAL)

if __name__ == "__main__":
    main()

3. Customization Tips #

• Adjust Polling Interval: If the station switches tracks frequently, lower CHECK_INTERVAL (but don't go below 10s to avoid overwhelming the server).
• Handle Edge Cases: Some streams might have different EXTINF formats—tweak the parsing logic if your stream uses a different structure (e.g., extra metadata fields).
• Add Error Handling: You could extend the script to retry failed requests or log errors to a separate file for debugging.

Notes #

• Since you can already see the song info in Chrome DevTools, this script will work for your stream (it's pulling the exact same playlist data your browser uses).
• If the stream uses encrypted segments, you don't need to decrypt them—we only care about the plaintext M3U8 playlist metadata.

内容的提问来源于stack exchange，提问作者Andrew Fabri