Since today available in the Language Resource Switchboard (just upload a sound file to test it):
OCTRA is a free, open-source web-application for the orthographic transcription of audio files. It supports three different editors for different needs. You can switch between these editors, they share the same transcript. Your proceedings are saved automatically to your browser. If your web browser or computer crashes just reopen your web browser and continue your work. See features
Overall OCTRA supports following features:
- Three editors
- Dictaphone-Editor: A simple editor without a signal display. It consists of an audio player and a text-editor.
- Linear-Editor: A classic editor with two signal displays and a text editor. The top signal display shows an audio signal of the whole audio file. After you select a part of the audio signal the bottom display shows a zoomed version of the selected part. You can transcribe the selected audio sequence with a text-editor.
- 2D-Editor: A multiline signal display shows the whole audio signal. You can scroll through the lines, add segment boundaries and much more. Using the ENTER key you can open a transcription window that shows the selected audio signal and a text-editor.
- Four modes: Online Mode, Local Mode, URL Mode and Demo Mode
- Support for Audio formats other than WAVE: MP3, Ogg Vorbis, FLAC, M4A
- Import & Export of various annotation file formats like TextGrid, ELAN, SRT and AnnotJSON
- Automatic speech recognition and alignment
- Auto-Saving
- Inline validation using transcription guidelines
- Shortcuts for faster annotation
- Additional tools
- Cutting Audio files
- Combine phrases into bigger segments
- Multi-Tier support
- Localization
- Customization