In CBCS 0 is valid IV length.

Author: avrecko

isoparser/src/main/java/org/mp4parser/boxes/iso23001/part7/AbstractSampleEncryptionBox.java

@@ -133,8 +133,8 @@ protected void getContent(ByteBuffer byteBuffer) {
         IsoTypeWriter.writeUInt32(byteBuffer, getNonEmptyEntriesNum());
         for (CencSampleAuxiliaryDataFormat entry : entries) {
             if (entry.getSize() > 0) {
-                if (entry.iv.length != 8 && entry.iv.length != 16) {
-                    throw new RuntimeException("IV must be either 8 or 16 bytes");
+                if (entry.iv.length != 0 && entry.iv.length != 8 && entry.iv.length != 16) {
+                    throw new RuntimeException("IV must be either 0, 8 or 16 bytes");
                 }
                 byteBuffer.put(entry.iv);
                 if (isSubSampleEncryption()) {

isoparser/src/main/java/org/mp4parser/boxes/iso23001/part7/CencSampleAuxiliaryDataFormat.java

@@ -75,7 +75,10 @@ public boolean equals(Object o) {
 
         CencSampleAuxiliaryDataFormat entry = (CencSampleAuxiliaryDataFormat) o;
 
-        if (!new BigInteger(iv).equals(new BigInteger(entry.iv))) {
+        BigInteger a = iv.length == 0 ? BigInteger.ZERO : new BigInteger(iv);
+        BigInteger b = entry.iv.length == 0 ? BigInteger.ZERO : new BigInteger(entry.iv);
+        if (!(a.equals(b)))
+        {
             return false;
         }
         if (pairs != null ? !Arrays.equals(pairs, entry.pairs) : entry.pairs != null) {