Frag parsing error when Audio Only Master Playlist includes media playlist twice

[Benny739]

What version of Hls.js are you using?

1.5.17

What browser (including version) are you using?

Chrome

What OS (including version) are you using?

MacOs

Test stream

https://vod-qa-hdd-01.b-cdn.net/3InDYWsdUyklwEfMCl9j/90516808-a56e-4bae-8b55-f56b0e069abc/hls.m3u8

Configuration

{}

Additional player setup steps

No response

Checklist

• The issue observed is not already reported by searching on Github under https://github.com/video-dev/hls.js/issues
• The issue occurs in the stable client (latest release) on https://hlsjs.video-dev.org/demo and not just on my page
• The issue occurs in the latest client (main branch) on https://hlsjs-dev.video-dev.org/demo and not just on my page
• The stream has correct Access-Control-Allow-Origin headers (CORS)
• There are no network errors such as 404s in the browser console when trying to play the stream

Steps to reproduce

1. Play the master playlist file
2. Audio playlist gets loaded twice
3. Frag parsing error happens which leads to bufferStalled error in some cases

The problem seems to be that the audio playlist ist included twice. According to the hls spec this should be a valid configuration and not lead to the above problems.

For more info see #6742

Reproduction:
https://hlsjs.video-dev.org/demo/?src=https%3A%2F%2Fvod-qa-hdd-01.b-cdn.net%2F3InDYWsdUyklwEfMCl9j%2F90516808-a56e-4bae-8b55-f56b0e069abc%2Fhls.m3u8&demoConfig=eyJlbmFibGVTdHJlYW1pbmciOnRydWUsImF1dG9SZWNvdmVyRXJyb3IiOmZhbHNlLCJzdG9wT25TdGFsbCI6ZmFsc2UsImR1bXBmTVA0IjpmYWxzZSwibGV2ZWxDYXBwaW5nIjotMSwibGltaXRNZXRyaWNzIjotMX0=

Expected behaviour

1. No frag parsing error

What actually happened?

Frag parsing error

Console output

Parsing error:Found no media in msn 0 of level "https://vod-qa-hdd-01.b-cdn.net/3InDYWsdUyklwEfMCl9j/90516808-a56e-4bae-8b55-f56b0e069abc/audio-de-mp4a.40.2.m3u8"

Chrome media internals output

No response

[robwalch]

I'm not seeing a frag parse error in dev, but I do see both audio and stream controllers loading the same playlist and requesting the same segments because HLS.js does not expect to need to deduplicate URIs for variants and media options in the multivariant playlist.