SubtitleEdit/subtitleedit · error · InvalidOperationException

CosyVoice3 (CrispASR) request failed — the connection to the

Error message

CosyVoice3 (CrispASR) request failed — the connection to the crispasr server was dropped.

What it means

InvalidOperationException from CosyVoice3CrispAsr.Speak's HttpRequestException catch: the POST failed but the server process is still alive (_serverProcess?.HasExited != true), so the request died without a server crash — a dropped/reset connection rather than a dead process. The original exception is chained and the server log is appended.

Source

Thrown at src/ui/Features/Video/TextToSpeech/Engines/CosyVoice3CrispAsr.cs:588

            response = await HttpClient.PostAsync($"{ServerBaseUrl}/v1/audio/speech", content, cancellationToken);
        }
        catch (HttpRequestException ex)
        {
            var serverLog = SnapshotServerLog();
            var launchCommand = _serverLaunchCommand;
            var died = _serverProcess?.HasExited == true;
            if (died)
            {
                StopServerInternal();
            }

            var failMsg = $"CosyVoice3 (CrispASR) request failed — Voice: {cosyVoice}, Text: {text}, "
                + $"RequestJson: {body}, ServerExited: {died}, ServerLog: {serverLog}"
                + LaunchCmdSuffix(launchCommand);
            Se.LogError(ex, failMsg);
            Se.WriteToolsLog(failMsg);

            throw new InvalidOperationException(
                (died
                    ? "CosyVoice3 (CrispASR) — the crispasr server crashed during synthesis."
                    : "CosyVoice3 (CrispASR) request failed — the connection to the crispasr server was dropped.")
                + (string.IsNullOrEmpty(serverLog) ? string.Empty : $"{Environment.NewLine}Server log:{Environment.NewLine}{serverLog}")
                + LaunchCmdSuffix(launchCommand),
                ex);
        }

        using (response)
        {
            if (!response.IsSuccessStatusCode)
            {
                var errorBody = await SafeReadErrorAsync(response, cancellationToken);
                var serverLog = SnapshotServerLog();
                var launchCommand = _serverLaunchCommand;
                var errMsg = $"CosyVoice3 (CrispASR) server error {(int)response.StatusCode} {response.StatusCode} — "
                    + $"Voice: {cosyVoice}, Text: {text}, RequestJson: {body}, "
                    + $"ResponseBody: {errorBody}, ServerLog: {serverLog}"

View on GitHub (pinned to 17a9f07487)

Solutions

Retry the synthesis call — EnsureServerRunningAsync will reuse or restart the healthy server.
Reduce input text length to shorten request duration and avoid keep-alive drops.
Check 'Server log' for transient backend errors that did not kill the process.
If it recurs, force a server restart by changing voice/model key or calling CosyVoice3CrispAsr.StopServer().

Defensive patterns

Strategy: retry

Try / catch

for (int attempt = 1; attempt <= 2; attempt++)
try { await cosyVoice3Engine.Speak(text, out, voice, lang, region, model, ct); return; }
catch (InvalidOperationException ex) when (ex.Message.Contains("connection to the crispasr server was dropped", StringComparison.Ordinal) && attempt < 2)
{ Se.WriteToolsLog($"Transient CosyVoice3 connection drop, retry {attempt}.", true); }
// server still alive — no StopServer needed

Prevention

Keep synthesis inputs short enough to avoid keep-alive/connection drops.
On repeated drops, force a server restart to reset connection state.
Treat a dropped connection (server alive) as transient and retry before surfacing failure.

When it happens

Trigger: HttpClient.PostAsync raises HttpRequestException while the server process is still running; e.g. the TCP connection was reset, a keep-alive timed out, the server closed the socket mid-response, or a transient loopback issue occurred.

Common situations: Long synthesis where the server closed the idle control connection; loopback stack/network blip; the server temporarily stopped accepting connections under load; transient OS resource exhaustion.

Related errors

AI-assisted analysis of SubtitleEdit/subtitleedit@17a9f07487 (2026-08-13). Data as JSON: /api/errors/ee5138b376cdeda3. Report an issue: GitHub.