diff --git a/app/src/main/java/org/schabi/newpipe/streams/DataReader.java b/app/src/main/java/org/schabi/newpipe/streams/DataReader.java
index 75b55cd73..8c57d8978 100644
--- a/app/src/main/java/org/schabi/newpipe/streams/DataReader.java
+++ b/app/src/main/java/org/schabi/newpipe/streams/DataReader.java
@@ -69,6 +69,11 @@ public class DataReader {
         return primitive[0] << 24 | primitive[1] << 16 | primitive[2] << 8 | primitive[3];
     }
 
+    public long readUnsignedInt()  throws IOException {
+        long value = readInt();
+        return value & 0xffffffffL;
+    }
+
     public short readShort() throws IOException {
         primitiveRead(SHORT_SIZE);
         return (short) (primitive[0] << 8 | primitive[1]);
diff --git a/app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java b/app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java
index 0cfd856e1..b7efa038e 100644
--- a/app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java
+++ b/app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java
@@ -294,10 +294,6 @@ public class Mp4DashReader {
 
 
 
-    private long readUint() throws IOException {
-        return stream.readInt() & 0xffffffffL;
-    }
-
     public static boolean hasFlag(int flags, int mask) {
         return (flags & mask) == mask;
     }
@@ -317,7 +313,7 @@ public class Mp4DashReader {
     private Box readBox() throws IOException {
         Box b = new Box();
         b.offset = stream.position();
-        b.size = stream.readInt();
+        b.size = stream.readUnsignedInt();
         b.type = stream.readInt();
 
         if (b.size == 1) {
@@ -478,7 +474,7 @@ public class Mp4DashReader {
     private long parse_tfdt() throws IOException {
         int version = stream.read();
         stream.skipBytes(3);// flags
-        return version == 0 ? readUint() : stream.readLong();
+        return version == 0 ? stream.readUnsignedInt() : stream.readLong();
     }
 
     private Trun parse_trun() throws IOException {
@@ -551,7 +547,7 @@ public class Mp4DashReader {
         stream.skipBytes(2 * (version == 0 ? 4 : 8));
 
         Mvhd obj = new Mvhd();
-        obj.timeScale = readUint();
+        obj.timeScale = stream.readUnsignedInt();
 
         // chunkDuration
         stream.skipBytes(version == 0 ? 4 : 8);
@@ -563,7 +559,7 @@ public class Mp4DashReader {
         // predefined
         stream.skipBytes(76);
 
-        obj.nextTrackId = readUint();
+        obj.nextTrackId = stream.readUnsignedInt();
 
         return obj;
     }
@@ -582,7 +578,7 @@ public class Mp4DashReader {
 
         stream.skipBytes(4);// reserved
 
-        obj.duration = version == 0 ? readUint() : stream.readLong();
+        obj.duration = version == 0 ? stream.readUnsignedInt() : stream.readLong();
 
         stream.skipBytes(2 * 4);// reserved
 
diff --git a/app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java b/app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java
index 64e4534cb..67f68d3a7 100644
--- a/app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java
+++ b/app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java
@@ -46,7 +46,7 @@ public class Mp4FromDashWriter {
 
     private int overrideMainBrand = 0x00;
 
-    private ArrayList<Integer> compatibleBrands = new ArrayList<>(5);
+    private final ArrayList<Integer> compatibleBrands = new ArrayList<>(5);
 
     public Mp4FromDashWriter(SharpStream... sources) throws IOException {
         for (SharpStream src : sources) {
diff --git a/app/src/main/java/us/shandian/giga/io/ChunkFileInputStream.java b/app/src/main/java/us/shandian/giga/io/ChunkFileInputStream.java
index 98015e37e..f7edf3975 100644
--- a/app/src/main/java/us/shandian/giga/io/ChunkFileInputStream.java
+++ b/app/src/main/java/us/shandian/giga/io/ChunkFileInputStream.java
@@ -104,7 +104,7 @@ public class ChunkFileInputStream extends SharpStream {
 
     @Override
     public long available() {
-        return (int) (length - position);
+        return length - position;
     }
 
     @SuppressWarnings("EmptyCatchBlock")
diff --git a/app/src/main/java/us/shandian/giga/io/CircularFileWriter.java b/app/src/main/java/us/shandian/giga/io/CircularFileWriter.java
index 102580570..d3dde7835 100644
--- a/app/src/main/java/us/shandian/giga/io/CircularFileWriter.java
+++ b/app/src/main/java/us/shandian/giga/io/CircularFileWriter.java
@@ -221,7 +221,7 @@ public class CircularFileWriter extends SharpStream {
                 available = out.length - offsetOut;
             }
 
-            int length = Math.min(len, (int) available);
+            int length = Math.min(len, (int) Math.min(Integer.MAX_VALUE, available));
             out.write(b, off, length);
 
             len -= length;