Convert M4A to MKA

Turn M4A recordings into MKA. The AAC or Apple Lossless audio is moved into Matroska as it is, so nothing is lost and a cut lands on the nearest frame; any other option re-encodes it as FLAC at the track's bit depth, 16 bits for AAC audio.

Converted in an isolated sandbox on our serversDeleted after 24 hours

Drop M4A files on the dialor turn it to pick what to do

M4A and MKA

From

M4A Audio

AAC audio in an MP4 container. What Apple Music and iTunes use.

Extensions: .m4a
MIME type: audio/mp4
Kind: Audio

To

Matroska Audio

Audio-only Matroska. Any codec, with chapters and tags.

Extensions: .mka
MIME type: audio/x-matroska
Kind: Audio

Options for M4A to MKA

audio.channels: Number of audio channels. 1 is mono, 2 is stereo.
audio.denoise: Reduce steady background noise.
audio.normalize: Normalize loudness to -16 LUFS as streaming services do.
audio.sample_rate: Audio sample rate in Hz.
speed: Playback speed multiplier. 2 plays twice as fast.
trim_end: Second at which the audio or video stops.
trim_start: Seconds to cut from the start of audio or video.