HLS LIVE直播流下载故障咨询（终端用户求助）

Hey Joe, I totally get the frustration—trying to use a pre-recorded video downloader for live HLS streams just doesn’t work because those tools aren’t built to handle real-time, fragmented content. Let’s walk through this step by step, no coding required.

First, Why Your Pre-Recorded Tool Fails #

HLS live streams send content in tiny, sequential chunks (usually .ts files, sometimes labeled as .part by your downloader). Pre-recorded tools expect a single, complete file to download, so they can’t automatically stitch these live chunks together as they come in.

Step 1: Sort Your PART Files Correctly #

First, make sure your .part files are in the exact order they were streamed. Most downloaders name them sequentially (e.g., stream_001.part, stream_002.part), but double-check—if they’re out of order, your final video will be jumbled.

Step 2: Merge Them with FFmpeg (Free, Easy Tool) #

FFmpeg is a free, widely used tool that handles video/audio processing, and it’s perfect for stitching these chunks together. Here’s how to use it:

• Download FFmpeg: Grab the version for your OS (Windows/Mac/Linux) from its official site—you don’t need to install it, just unzip the folder.
• Create a File List:
  • On Windows: Open Command Prompt in the folder with your .part files, then run:
    dir /b /on *.part > list.txt
  • On Mac/Linux: Open Terminal in the folder, then run:
    ls -v *.part > list.txt
    This creates a list.txt file that lists all your .part files in order.
• Run the Merge Command:
  In the same Command Prompt/Terminal window, run this command (replace output.mp4 with whatever you want to name your final video):
  ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4
  The -c copy part tells FFmpeg to copy the video/audio without re-encoding, which is fast and preserves quality.

Even Better: Download the Live Stream Directly (Avoid PART Files) #

If you can get the .m3u8 URL of the live stream (this is the "playlist" file that tells players where to find the chunks), you can skip dealing with .part files entirely. Just run this FFmpeg command:
ffmpeg -i "https://your-stream-url.m3u8" -c copy live_recording.mp4
FFmpeg will automatically download and stitch the chunks in real time as the stream plays.

Quick Notes #

• Copyright: Make sure you have permission to download the live stream—most sports channels prohibit unauthorized recording.
• Troubleshooting: If your merged video has glitches or audio sync issues, double-check that your .part files are in the correct order, or try re-downloading the stream using the .m3u8 method.

内容的提问来源于stack exchange，提问作者joe