Pre-recorded Audio
Supported Audio & Video Formats
The API natively accepts a wide range of audio and video formats.
Audio formats
| Format | Extension | Notes |
|---|---|---|
| WAV | .wav | Recommended. Uncompressed, lossless. |
| MP3 | .mp3 | Compressed. Widely supported. |
| FLAC | .flac | Lossless compression. |
| OGG | .ogg | Open container format. |
| M4A | .m4a | AAC audio in MP4 container. |
| WebM | .webm | Web streaming format. |
Video formats
Audio is automatically extracted from video files before transcription.
| Format | Extension | Notes |
|---|---|---|
| MP4 | .mp4 | Most common video format. Audio extracted automatically. |
| MKV | .mkv | Matroska container. |
| AVI | .avi | Legacy format. Supported. |
| MOV | .mov | Apple QuickTime format. |
Best practice: Use 16kHz mono WAV for optimal accuracy. Convert with:
ffmpeg -i input.mp3 -ar 16000 -ac 1 output.wav