Convert GSM to SPX

Turn GSM recordings into Speex. Re-encoded as Speex speech coding in an Ogg file at 8, 16 or 32 kHz in mono or stereo, unless audio.channels is given, which loses a little more than the GSM already did.

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 SPX

From

GSM Audio

GSM 06.10 audio from telephony.

Extensions: .gsm
MIME type: audio/x-gsm
Kind: Audio

To

Speex

Speex speech audio in an Ogg container, the predecessor of Opus.

Extensions: .spx
MIME type: audio/x-speex
Kind: Audio

Options for GSM to SPX

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.
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.