M2TS to SPH Converter
Extract M2TS Blu-ray audio as SPHERE speech data online
Blu-ray to Speech Data
Extract dialogue from M2TS video and package it as NIST SPHERE — ready for speech recognition training and linguistic corpus building.
Research-Grade Quality
M2TS Blu-ray files deliver high-quality audio. SPH output preserves that quality in a format designed for serious speech research work.
Secure Processing
M2TS uploads are deleted after conversion. SPH output files are removed within 24 hours — your research materials remain private.
How to convert M2TS to SPH
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose sph or any other format you need as a result (more than 200 formats supported)
Let the file convert and you can download your sph file right afterwards
About formats
Frequently Asked Questions
SPH is the NIST standard for speech research audio. Extracting M2TS dialogue into SPH format builds datasets from Blu-ray video content.
SPH stores PCM data without compression. High-quality M2TS audio translates well — speech content reaches your research tools with full clarity.
Kaldi, HTK, Praat, and NIST speech evaluation tools all work with SPH natively. It is the standard interchange format for speech research.
The full audio track from M2TS is extracted. For specific dialogue segments, trim your M2TS source before conversion for targeted results.
SPH supports multi-channel data, but speech corpora typically use mono. M2TS surround audio is mixed down based on the output configuration.