Function formatFfmpegError

packages/engine/src/utils/runFfmpeg.ts:57–77

(
  exitCode: number | null,
  stderr: string,
  tailLines: number = DEFAULT_STDERR_TAIL_LINES,
)

 * exactly which option to fix.
 */
export function formatFfmpegError(
  exitCode: number | null,
  stderr: string,
  tailLines: number = DEFAULT_STDERR_TAIL_LINES,
): string {
  const tail = (stderr ?? "")
    .split(/\r?\n/)
    .filter((line) => line.length > 0)
    .slice(-tailLines)
    .join("\n");
  if (exitCode === null) {
    return tail ? `[FFmpeg] ${tail}` : "[FFmpeg] process error";
  }
  const windowsMessage = formatWindowsFfmpegExit(exitCode);
  if (windowsMessage) {
    return tail ? `${windowsMessage}\nffmpeg stderr (tail):\n${tail}` : windowsMessage;
  }
  return tail
    ? `FFmpeg exited with code ${exitCode}\nffmpeg stderr (tail):\n${tail}`
    : `FFmpeg exited with code ${exitCode}`;
}

export async function runFfmpeg(args: string[], opts?: RunFfmpegOptions): Promise<RunFfmpegResult> {
  const startMs = Date.now();