Convert GSM to MKA

Turn GSM recordings into MKA. Stored as 16-bit FLAC in Matroska, which keeps the decoded sound exactly but cannot bring back what the GSM lost.

Converted in an isolated sandbox on our serversDeleted after 24 hours

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

GSM and MKA

From

GSM Audio

GSM 06.10 audio from telephony.

Extensions: .gsm
MIME type: audio/x-gsm
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 GSM 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.