diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7f985d4487..fd565849fa 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -5116,25 +5116,25 @@ enum AVLockOp {
 
 /**
  * Register a user provided lock manager supporting the operations
- * specified by AVLockOp.  The "mutex" argument to the function points
+ * specified by AVLockOp. The "mutex" argument to the function points
  * to a (void *) where the lockmgr should store/get a pointer to a user
- * allocated mutex.  It is NULL upon AV_LOCK_CREATE and equal to the
- * value left by the last call for all other ops.  If the lock manager is
+ * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
+ * value left by the last call for all other ops. If the lock manager is
  * unable to perform the op then it should leave the mutex in the same
- * state as when it was called and return a non-zero value.  However,
+ * state as when it was called and return a non-zero value. However,
  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
- * have been successfully destroyed.  If av_lockmgr_register succeeds
+ * have been successfully destroyed. If av_lockmgr_register succeeds
  * it will return a non-negative value, if it fails it will return a
  * negative value and destroy all mutex and unregister all callbacks.
  * av_lockmgr_register is not thread-safe, it must be called from a
  * single thread before any calls which make use of locking are used.
  *
- * @param cb User defined callback.  av_lockmgr_register invokes calls
+ * @param cb User defined callback. av_lockmgr_register invokes calls
  *           to this callback and the previously registered callback.
  *           The callback will be used to create more than one mutex
  *           each of which must be backed by its own underlying locking
  *           mechanism (i.e. do not use a single static object to
- *           implement your lock manager).  If cb is set to NULL the
+ *           implement your lock manager). If cb is set to NULL the
  *           lockmgr will be unregistered.
  */
 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index c2c557934e..f1ba52cecd 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -3492,12 +3492,12 @@ int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
         void *new_avformat_mutex = NULL;
         int err;
         if (err = cb(&new_codec_mutex, AV_LOCK_CREATE)) {
-            return err > 0 ? AVERROR_EXTERNAL : err;
+            return err > 0 ? AVERROR_UNKNOWN : err;
         }
         if (err = cb(&new_avformat_mutex, AV_LOCK_CREATE)) {
             // Ignore failures to destroy the newly created mutex.
             cb(&new_codec_mutex, AV_LOCK_DESTROY);
-            return err > 0 ? AVERROR_EXTERNAL : err;
+            return err > 0 ? AVERROR_UNKNOWN : err;
         }
         lockmgr_cb     = cb;
         codec_mutex    = new_codec_mutex;
@@ -3536,6 +3536,7 @@ int ff_unlock_avcodec(void)
         if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE))
             return -1;
     }
+
     return 0;
 }
 
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 9520ba6c06..6ac5e7cbda 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -30,7 +30,7 @@
 
 #define LIBAVCODEC_VERSION_MAJOR 56
 #define LIBAVCODEC_VERSION_MINOR  3
-#define LIBAVCODEC_VERSION_MICRO 100
+#define LIBAVCODEC_VERSION_MICRO 101
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \