add SetLogLevel

ffmpeg.go

@@ -5,11 +5,26 @@ package ffmpeg
 #include "ffmpeg.h"
 void ffinit() {
 	av_register_all();
-	av_log_set_level(AV_LOG_DEBUG);
 }
 */
 import "C"
 
+const (
+	QUIET = int(C.AV_LOG_QUIET)
+	PANIC = int(C.AV_LOG_PANIC)
+	FATAL = int(C.AV_LOG_FATAL)
+	ERROR = int(C.AV_LOG_ERROR)
+	WARNING = int(C.AV_LOG_WARNING)
+	INFO = int(C.AV_LOG_INFO)
+	VERBOSE = int(C.AV_LOG_VERBOSE)
+	DEBUG = int(C.AV_LOG_DEBUG)
+	TRACE = int(C.AV_LOG_TRACE)
+)
+
+func SetLogLevel(level int) {
+	C.av_log_set_level(C.int(level))
+}
+
 func init() {
 	C.ffinit()
 }