--- a/src/decoder/plugins/FfmpegDecoderPlugin.cxx
+++ b/src/decoder/plugins/FfmpegDecoderPlugin.cxx
@@ -478,6 +478,13 @@ ffmpeg_probe(DecoderClient *client, Inpu
 
 	unsigned char buffer[BUFFER_SIZE];
 	size_t nbytes = decoder_read(client, is, buffer, BUFFER_SIZE);
+
+	if ((nbytes > 0) && (nbytes < 1024))
+	{
+		// Gobble some more data if header is small
+		nbytes += decoder_read(client, is, buffer + nbytes, BUFFER_SIZE - nbytes);
+	}
+
 	if (nbytes <= PADDING)
 		return nullptr;