diff --git a/thunder/src/main/java/com/xunlei/downloadlib/Util.java b/thunder/src/main/java/com/xunlei/downloadlib/Util.java
index 9f066b2b3..386950125 100644
--- a/thunder/src/main/java/com/xunlei/downloadlib/Util.java
+++ b/thunder/src/main/java/com/xunlei/downloadlib/Util.java
@@ -7,9 +7,10 @@ public class Util {
 
     private static final List<String> VIDEO = Arrays.asList("avi", "flv", "mkv", "mov", "mp4", "mpeg", "mpe", "mpg", "wmv");
     private static final List<String> AUDIO = Arrays.asList("aac", "ape", "flac", "mp3", "m4a", "ogg");
+    private static final long MINIMAL = 30 * 1024 * 1024;
 
-    public static boolean isMedia(String ext) {
-        return VIDEO.contains(ext) || AUDIO.contains(ext);
+    public static boolean isMedia(String ext, long size) {
+        return (VIDEO.contains(ext) || AUDIO.contains(ext)) && size > MINIMAL;
     }
 
     public static boolean notAd(List<String> ads, String name) {
diff --git a/thunder/src/main/java/com/xunlei/downloadlib/parameter/TorrentInfo.java b/thunder/src/main/java/com/xunlei/downloadlib/parameter/TorrentInfo.java
index 6c58c450b..cb0626287 100644
--- a/thunder/src/main/java/com/xunlei/downloadlib/parameter/TorrentInfo.java
+++ b/thunder/src/main/java/com/xunlei/downloadlib/parameter/TorrentInfo.java
@@ -29,7 +29,7 @@ public class TorrentInfo {
 
     public List<TorrentFileInfo> getMedias(List<String> ads) {
         List<TorrentFileInfo> items = new ArrayList<>();
-        for (TorrentFileInfo item : getSubFileInfo()) if (Util.isMedia(item.getExt()) && Util.notAd(ads, item.getFileName())) items.add(item.file(getFile()));
+        for (TorrentFileInfo item : getSubFileInfo()) if (Util.isMedia(item.getExt(), item.getFileSize()) && Util.notAd(ads, item.getFileName())) items.add(item.file(getFile()));
         TorrentFileInfo.Sorter.sort(items);
         return items;
     }