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Fix frontend buffer rendering for slow backends

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This commit is contained in:
Quentin Fuxa 2026-02-14 09:28:00 +01:00
parent 9ac7c26a0b
commit 32de7b1276
2 changed files with 31 additions and 18 deletions
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19
whisperlivekit/web/live_transcription.js
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@ -273,6 +273,13 @@ function setupWebSocket() {
return; return;
} }
// Ignore diff/snapshot messages — the default frontend uses full-state mode.
// These are only sent when a client explicitly opts in via ?mode=diff.
if (data.type === "diff" || data.type === "snapshot") {
console.warn("Received diff-protocol message but frontend is in full mode; ignoring.", data.type);
return;
}
if (data.type === "ready_to_stop") { if (data.type === "ready_to_stop") {
console.log("Ready to stop received, finalizing display and closing WebSocket."); console.log("Ready to stop received, finalizing display and closing WebSocket.");
waitingForStop = false; waitingForStop = false;
@ -364,7 +371,13 @@ function renderLinesWithBuffer(
} }
lastSignature = signature; lastSignature = signature;
const linesHtml = (lines || []) // When there are no committed lines yet but buffer text exists (common with
// slow backends like voxtral on MPS), render the buffer as a standalone line.
const effectiveLines = (lines || []).length === 0 && (buffer_transcription || buffer_diarization)
? [{ speaker: 1, text: "" }]
: (lines || []);
const linesHtml = effectiveLines
.map((item, idx) => { .map((item, idx) => {
let timeInfo = ""; let timeInfo = "";
if (item.start !== undefined && item.end !== undefined) { if (item.start !== undefined && item.end !== undefined) {
@ -389,7 +402,7 @@ function renderLinesWithBuffer(
let currentLineText = item.text || ""; let currentLineText = item.text || "";
if (idx === lines.length - 1) { if (idx === effectiveLines.length - 1) {
if (!isFinalizing && item.speaker !== -2) { if (!isFinalizing && item.speaker !== -2) {
speakerLabel += `<span class="label_transcription"><span class="spinner"></span>Transcription lag <span id='timeInfo'><span class="lag-transcription-value">${fmt1( speakerLabel += `<span class="label_transcription"><span class="spinner"></span>Transcription lag <span id='timeInfo'><span class="lag-transcription-value">${fmt1(
remaining_time_transcription remaining_time_transcription
@ -424,7 +437,7 @@ function renderLinesWithBuffer(
if (item.translation) { if (item.translation) {
translationContent += item.translation.trim(); translationContent += item.translation.trim();
} }
if (idx === lines.length - 1 && buffer_translation) { if (idx === effectiveLines.length - 1 && buffer_translation) {
const bufferPiece = isFinalizing const bufferPiece = isFinalizing
? buffer_translation ? buffer_translation
: `<span class="buffer_translation">${buffer_translation}</span>`; : `<span class="buffer_translation">${buffer_translation}</span>`;