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Flush 'stderr' stream after each progress message on Win32 platform, when not connected directly to a terminal. This is required so that progress updates don't get stuck in pipes.

--- a/frontend/main.c

+++ b/frontend/main.c

@@ -80,11 +80,16 @@

     if (!quiet)

     {

         va_start(ap, fmt);

-

         vfprintf(stream, fmt, ap);

-

         va_end(ap);

     }

+

+#ifdef _WIN32

+	if (!_isatty(_fileno(stream)))

+	{

+		fflush(stream); /*ensure real-time progress output on Win32*/

+	}

+#endif

 }

 /* FAAD file buffering routines */