Re-reading Local M3U8 Files with FFmpeg

Re-reading Local M3U8 Files with FFmpeg

M3U8 files are popularly used for streaming multimedia content over the internet, especially for adaptive bitrate streaming. However, you might want to re-read a local M3U8 file with FFmpeg for various reasons, such as testing, debugging, or offline playback. In this article, we will discuss how to re-read a local M3U8 file using FFmpeg.

Downloading a New Local M3U8 File

Before we proceed with re-reading a local M3U8 file, let's first discuss how to download a new one. Suppose you have an internet link to an M3U8 file, as shown below:

#EXTM3U
 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1000,RESOLUTION=1280x720
 
 #EXT-X-ENDLIST

To download this M3U8 file, you can use the following FFmpeg command:

ffmpeg -i  -c copy .m3u8

This command downloads the M3U8 file from the given URL and saves it as .m3u8 in your local directory.

Re-reading a Local M3U8 File

Now that you have a local M3U8 file, let's see how to re-read it using FFmpeg. The following command reads the M3U8 file and prints the available streams:

ffmpeg -i .m3u8

You should see output similar to the following:

[m3u8 @ 0x55b052c0d840] Stream index 0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [m3u8 @ 0x55b052c0d840] Stream index 1: Audio: aac (LC) (mp4a / 0x6134706d), 48000 Hz, 5 channels, fltp, 1536 kb/s

This output indicates that there are two streams in the M3U8 file: one video stream and one audio stream. You can extract each stream individually using FFmpeg.

Extracting Streams from a Local M3U8 File

To extract a video stream from the M3U8 file, use the following command:

ffmpeg -i .m3u8 -c:v libx264 -crf 23 .mp4

This command extracts the video stream and saves it as an MP4 file with the given output filename.

Similarly, to extract an audio stream, use the following command:

ffmpeg -i .m3u8 -c:a libmp3lame .mp3

This command extracts the audio stream and saves it as an MP3 file with the given output filename.