When setting up your radio stream, you will need to choose an audio format, and the two most common options are MP3 and AAC. Both compress your audio so it can be streamed efficiently, but they do it differently, and each has strengths. Choosing the right one affects sound quality, compatibility, and how well your stream performs at lower bitrates. This guide compares them.
MP3: the universal standard #
MP3 is the most widely supported audio format in the world. Practically every device, browser, and media player can play it without any trouble, which makes it the safest choice for maximum compatibility. Its main points are:
- Compatibility: plays virtually everywhere, on every device.
- Simplicity: supported by all broadcasting software and directories.
- Solid quality: sounds good at 128 kbps and above.
AAC: better quality at lower bitrates #
AAC is a more modern format that generally sounds better than MP3 at the same bitrate, especially at lower bitrates. This makes it attractive when you want good quality while keeping bandwidth low. Its main points are:
- Efficiency: better sound per kilobit, so it shines at lower bitrates.
- Quality: often clearer than MP3 at the same setting.
- Modern support: widely supported, though very slightly less universal than MP3.
Como escolher #
The right choice depends on your priorities:
- Choose MP3 if you want maximum compatibility and a no-fuss setup that works everywhere.
- Choose AAC if bandwidth is tight or you want the best quality at a lower bitrate, and your audience uses modern players.
For many stations, MP3 at 128 kbps is a perfectly good default. If you are serving a mobile-heavy audience and want to save bandwidth, AAC at a lower bitrate can deliver similar quality for less.
You can offer both #
With Icecast and multiple mount points, you do not necessarily have to pick just one. You can run an MP3 stream for maximum compatibility and an AAC stream for listeners who prefer it, letting each person choose what plays best for them.
Solução de problemas #
- Some listeners cannot play the stream: if using AAC, consider adding an MP3 mount for compatibility.
- Quality seems low: raise the bitrate, or switch to AAC for better quality at the same bitrate.
- Format mismatch errors: make sure your encoder format matches your server configuration.
Precisa de ajuda? #
If you are unsure which format suits your audience, our support team can advise over live chat.
