Can not get m3u8 and ts segments when outputting to buffer

[mesozoic-technology]

Version information

• fluent-ffmpeg version: 2.1.3
• ffmpeg version: 7.1
• OS: mac

Code to reproduce

My problem is that when I let fluent write the files to my filesystem on its own, it writes about 10 .ts files and a .m3u8 file that contains lines referencing those .ts files.

But when I try to save this into memory into two different buffers it seems I can get a bunch of .ts files in the buffer, but the m3u8 file does no t have the same amount of references to the segments that it does when I just save it to the filesystem.

I tried to put it into one command using two pipes (chatgpt told me so but it might be hallucinating).

This is what I wind up writing to the filesystem when I try to write what I got in memory for the m3u8. Notice there is only one pipe:10.ts. There should be about 10 of them, it seems.

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:10.032000,
pipe:10.ts
#EXT-X-ENDLIST

The size of the buffer for the segments is about four times the size of the file I am trying to turn into an HLS format for playback, for what that's worth.

here is what gets the m3u8

    const readable = new Readable()
    readable.push(buffer)
    readable.push(null)

    const passthroughm3u8 = new PassThrough()
    const chunksm3u8 = []

    passthroughm3u8.on('data', chunk => chunksm3u8.push(chunk))
    passthroughm3u8.on('end', () => resolve(Buffer.concat(chunksm3u8)))
    passthroughm3u8.on('error', reject)

    ffmpeg()
      .input(readable)
      .inputFormat('mp4')
      .outputOptions([ 
        '-f hls', 
        '-hls_time 10', 
        '-hls_list_size 0',
      ])
      .on('error', reject)
      .pipe(passthroughm3u8)

here is what gets the segments

    const readable = new Readable()
    readable.push(buffer)
    readable.push(null)

    const passthrough = new PassThrough()
    const chunks = []

    passthrough.on('data', chunk => chunks.push(chunk))
    passthrough.on('end', () => {
      console.log("done")
      resolve(Buffer.concat(chunks))
    })
    passthrough.on('error', reject)

    ffmpeg()
      .input(readable)
      .inputFormat('mp4')
      .outputOptions([ 
        '-f mpegts',
        '-hls_time 10', 
        '-hls_list_size 0',
        '-hls_segment_type mpegts',
      ])
      .on('error', reject)
      .pipe(passthrough, { end: true })

Checklist

• [-] I have read the FAQ
• [ does not apply ] I tried the same with command line ffmpeg and it works correctly (hint: if the problem also happens this way, this is an ffmpeg problem and you're not reporting it to the right place)
• [ does not apply ] I have included full stderr/stdout output from ffmpeg