8-bit samples that compand 13-bit audio samples using G.711 PCMU/a-law.
Amr
Adaptive Multi-Rate Narrowband codec. sample_rate_hertz must be 8000.
AmrWb
Adaptive Multi-Rate Wideband codec. sample_rate_hertz must be 16000.
Flac
FLAC (Free Lossless Audio
Codec) is the recommended encoding because it is lossless (therefore
recognition is not compromised) and requires only about half the
bandwidth of LINEAR16. FLAC stream encoding supports 16-bit and
24-bit samples, however, not all fields in STREAMINFO are supported.
Linear16
Uncompressed 16-bit signed little-endian samples (Linear PCM).
Mulaw
8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.
OggOpus
Opus encoded audio frames in Ogg container
(OggOpus).
sample_rate_hertz must be 16000.
SpeexWithHeaderByte
Although the use of lossy encodings is not recommended, if a very low
bitrate encoding is required, OGG_OPUS is highly preferred over
Speex encoding. The Speex encoding supported by
Dialogflow API has a header byte in each block, as in MIME type
audio/x-speex-with-header-byte.
It is a variant of the RTP Speex encoding defined in
RFC 5574.
The stream is a sequence of blocks, one block per RTP packet. Each block
starts with a byte containing the length of the block, in bytes, followed
by one or more frames of Speex data, padded to an integral number of
bytes (octets) as specified in RFC 5574. In other words, each RTP header
is replaced with a single byte containing the block length. Only Speex
wideband is supported. sample_rate_hertz must be 16000.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003eThis page provides reference documentation for the \u003ccode\u003eAudioEncoding\u003c/code\u003e enum within the Google Cloud Dialogflow CX v3 API, detailing available audio encoding formats.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of the \u003ccode\u003eAudioEncoding\u003c/code\u003e documentation is version 2.23.0, with a complete history of versions going back to 1.0.0, each with its corresponding documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eAudioEncoding\u003c/code\u003e enum specifies the audio encoding of content in conversational query requests, linking to Cloud Speech API documentation for further details.\u003c/p\u003e\n"],["\u003cp\u003eSupported audio encodings include \u003ccode\u003eAlaw\u003c/code\u003e, \u003ccode\u003eAmr\u003c/code\u003e, \u003ccode\u003eAmrWb\u003c/code\u003e, \u003ccode\u003eFlac\u003c/code\u003e, \u003ccode\u003eLinear16\u003c/code\u003e, \u003ccode\u003eMulaw\u003c/code\u003e, \u003ccode\u003eOggOpus\u003c/code\u003e, and \u003ccode\u003eSpeexWithHeaderByte\u003c/code\u003e, each with specific requirements and descriptions.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eFlac\u003c/code\u003e is the recommended encoding due to its lossless nature and half the bandwidth of \u003ccode\u003eLinear16\u003c/code\u003e, while \u003ccode\u003eSpeexWithHeaderByte\u003c/code\u003e is supported for low bitrate needs, though \u003ccode\u003eOggOpus\u003c/code\u003e is preferred.\u003c/p\u003e\n"]]],[],null,[]]
