fix(producer): handle no-audio source files in resolveMediaDuration

[miguel-heygen]

Problem

When an <audio> element referenced a file with no audio stream (e.g. a silent video used as an audio src), resolveMediaDuration called extractAudioMetadata without a guard. ffprobe threw [FFmpeg] No audio stream found, which propagated uncaught through Promise.all in compileHtmlFile and crashed the entire render.

What this fixes

Wraps the extractAudioMetadata probe in a try-catch inside resolveMediaDuration. On failure the function returns { duration: 0 }, so the element is excluded from the composition gracefully — the same pattern already used for missing files and failed HTTP downloads.

How

packages/producer/src/services/htmlCompiler.ts — resolveMediaDuration():

// Before — throws and crashes the render:
const metadata =
  tagName === "video"
    ? await extractMediaMetadata(filePath)
    : await extractAudioMetadata(filePath);

// After — skips gracefully with duration 0:
} else {
  try {
    metadata = await extractAudioMetadata(filePath);
  } catch {
    return { duration: 0, resolvedPath: filePath };
  }
}