m4a

Audio M4A Example Files For QA Manual Testing M4A files: a 1 second clip (4 KB) and a 5 second clip (17 KB), both a 440 Hz tone encoded as AAC at 24 kbps. M4A is the usual audio format from Apple devices, including voice memos, so phones are the most likely source of uploads in this format. The MP4 container around the audio makes it behave differently from MP3 or WAV in some tools, for example in how duration is found. If your app handles MP3 but fails on M4A, these files will show it.