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MP2 is the audio format that nobody talks about but everybody hears. While MP3 (Layer III) conquered consumer audio, MP2 (Layer II) quietly became the standard for broadcast television and radio across Europe. The DAB digital radio standard, DVB television, and many broadcast automation systems all use MP2 because it handles the specific demands of broadcast — low latency, error resilience, and consistent quality — better than MP3.
At the same bitrate, MP3 sounds better than MP2 for music. But MP2 has lower encoding latency (important for live broadcast), better error handling (important for transmission), and at higher bitrates (256-384 kbps) the quality difference becomes negligible. For broadcast use cases, these tradeoffs matter.
You'll encounter MP2 files when working with broadcast recordings, DVB captures, or European radio archives. VLC and most media players handle them. For consumer use, convert to MP3 or AAC — there's no benefit to keeping personal audio in MP2.