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diff --git a/cinelerra-5.1/cinelerra/formatcheck.C b/cinelerra-5.1/cinelerra/formatcheck.C
new file mode 100644
index 00000000..d3469623
--- /dev/null
+++ b/cinelerra-5.1/cinelerra/formatcheck.C
@@ -0,0 +1,80 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#include "asset.h"
+#include "file.h"
+#include "errorbox.h"
+#include "formatcheck.h"
+#include "mwindow.inc"
+
+#include <libintl.h>
+#define _(String) gettext(String)
+#define gettext_noop(String) String
+#define N_(String) gettext_noop (String)
+
+FormatCheck::FormatCheck(Asset *asset)
+{
+	this->asset = asset;
+}
+
+FormatCheck::~FormatCheck()
+{
+}
+
+int FormatCheck::check_format()
+{
+	int result = 0;
+
+	if(!result && asset->video_data)
+	{
+// Only 1 format can store video.
+		if(!File::supports_video(asset->format))
+		{
+			ErrorBox errorbox(_(PROGRAM_NAME ": Error"));
+			errorbox.create_objects(_("The format you selected doesn't support video."));
+			errorbox.run_window();
+			result = 1;
+		}
+	}
+	
+	if(!result && asset->audio_data)
+	{
+		if(!File::supports_audio(asset->format))
+		{
+			ErrorBox errorbox(_(PROGRAM_NAME ": Error"));
+			errorbox.create_objects(_("The format you selected doesn't support audio."));
+			errorbox.run_window();
+			result = 1;
+		}
+
+		if(!result && asset->bits == BITSULAW && 
+			asset->format != FILE_PCM)
+		{
+			ErrorBox errorbox(_(PROGRAM_NAME ": Error"));
+			errorbox.create_objects(_("ULAW compression is only available in\n" 
+				"Quicktime Movies and PCM files."));
+			errorbox.run_window();
+			result = 1;
+		}
+	}
+
+	return result;
+}