Supported File Types
This page details the audio and video formats supported by the transcription service. While the API generally refers to "audio files," both audio-only and video files with audio tracks are accepted.
Supported Containers and Codecs
The API supports a wide range of common audio and video containers and codecs. The following table lists the tested and verified combinations:
| File Extension | Container | Audio Codec | Video Codec | Notes |
|---|---|---|---|---|
.mp3 | MP3 | libmp3lame | N/A | Standard MP3 audio. |
.m4a | MP4 | AAC (Built-in) | N/A | AAC audio, typically using FFmpeg's built-in encoder. |
.opus | Ogg | Opus | N/A | Opus audio, often using libopus. |
.flac | FLAC | FLAC | N/A | Lossless audio. |
.wav | WAV | PCM (s16le) | N/A | Uncompressed PCM audio, 16-bit signed little-endian. |
.mp4 | MP4 | AAC | H.264 | Video with AAC audio. |
.mp4 | MP4 | AAC | H.265 | Video with AAC audio. |
.webm | WebM | Opus | VP9 | Video with Opus audio. |
.webm | WebM | Opus | AV1 (SVT-AV1) | Video with Opus audio, using the SVT-AV1 encoder. |
.ogg | Ogg | Vorbis | Theora | Video with Vorbis audio. |
Note: While other combinations of containers and codecs may work, the ones listed above are explicitly tested and guaranteed to be supported. If you encounter issues with a format not listed here, please contact support.
General Guidelines
- The service attempts to automatically detect the container and codec of the input file.
- For best results, use standard, widely-supported codecs such as standard MP3 audio.
- If your file uses a less common codec, consider transcoding it to a more common format (like MP3 for audio or H.264/AAC in MP4 for video) before attempting to transcribe it.