OutOfMemory Exception while encoding Base64

Question

I'm making a video with Google Glass and want to encode it into a Base64 String. When I'm trying to do this I always get an "OutOfMemoryException". The coding looks like the following:

        File mFile = new File(this.mNotification.getVideo());
        if (mFile.exists()) {
            try {
                InputStream is = new FileInputStream(mFile);
                try {
                    byte[] bytes = org.apache.commons.io.IOUtils.toByteArray(is);
                    byte[] value = org.apache.commons.codec.binary.Base64.encodeBase64(bytes);
                    this.mNotification.setVideo(new String(value));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

I only have the opportunity to send the video as a Base64 String...