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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 document outlines the various versions of the \u003ccode\u003eAudioEncoding\u003c/code\u003e enum within the \u003ccode\u003eGoogle.Cloud.Dialogflow.Cx.V3\u003c/code\u003e namespace, with version 2.23.0 being the latest.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eAudioEncoding\u003c/code\u003e enum defines the audio encoding formats that can be used in conversational query requests, such as \u003ccode\u003eAmr\u003c/code\u003e, \u003ccode\u003eFlac\u003c/code\u003e, \u003ccode\u003eLinear16\u003c/code\u003e, \u003ccode\u003eOggOpus\u003c/code\u003e, and others.\u003c/p\u003e\n"],["\u003cp\u003eEach supported encoding type, including \u003ccode\u003eSpeexWithHeaderByte\u003c/code\u003e, comes with specific requirements for \u003ccode\u003esample_rate_hertz\u003c/code\u003e, that the user must meet in order to use them.\u003c/p\u003e\n"],["\u003cp\u003eThe document provides links to the Cloud Speech API documentation and external resources for further information on the audio encoding formats.\u003c/p\u003e\n"],["\u003cp\u003eThere is a comprehensive list of versions ranging from 1.0.0 to 2.23.0, allowing users to access documentation for older versions if they need to reference past implementations.\u003c/p\u003e\n"]]],[],null,[]]
