diff --git a/src/meta/ngc_adpdtk.c b/src/meta/ngc_adpdtk.c
index c7e4d0b1..63db6433 100644
--- a/src/meta/ngc_adpdtk.c
+++ b/src/meta/ngc_adpdtk.c
@@ -3,45 +3,54 @@
 #include "../util.h"
 
 /* DTK - headerless Nintendo GC DTK file [Harvest Moon: Another Wonderful Life (GC), XGRA (GC)] */
-VGMSTREAM * init_vgmstream_ngc_adpdtk(STREAMFILE *streamFile) {
-    VGMSTREAM * vgmstream = NULL;
+VGMSTREAM* init_vgmstream_ngc_adpdtk(STREAMFILE* sf) {
+    VGMSTREAM* vgmstream = NULL;
     off_t start_offset;
-    int channel_count, loop_flag;
+    int channels, loop_flag;
 
 
     /* checks */
-    /* .dtk: standard [XGRA (GC)], .adp: standard [Harvest Moon AWL (GC)], .wav/lwav: Alien Hominid (GC) */
-    if ( !check_extensions(streamFile,"dtk,adp,wav,lwav"))
+    /* .dtk: standard [XGRA (GC)]
+     * .adp: standard [Harvest Moon AWL (GC)]
+     * .wav/lwav: Alien Hominid (GC) */
+    if (!check_extensions(sf,"dtk,adp,wav,lwav"))
         goto fail;
 
     /* check valid frames as files have no header, and .adp/wav are common */
     {
         int i;
         for (i = 0; i < 10; i++) { /* try a bunch of frames */
-            if (read_8bit(0x00 + i*0x20,streamFile) != read_8bit(0x02 + i*0x20,streamFile) ||
-                read_8bit(0x01 + i*0x20,streamFile) != read_8bit(0x03 + i*0x20,streamFile))
-                goto fail;
             /* header 0x00/01 are repeated in 0x02/03 (for error correction?),
              * could also test header values (upper nibble should be 0..3, and lower nibble 0..C) */
+            if (read_8bit(0x00 + i*0x20,sf) != read_8bit(0x02 + i*0x20,sf) ||
+                read_8bit(0x01 + i*0x20,sf) != read_8bit(0x03 + i*0x20,sf))
+                goto fail;
+
+            /* frame headers for silent frames are 0x0C, never null */
+            if (read_8bit(0x00 + i*0x20,sf) == 0x00)
+                goto fail;
         }
     }
 
-    /* always stereo, no loop (since it's hardware-decoded and streamed) */
-    channel_count = 2;
+    /* DTK (Disc Track) are DVD hardware-decoded streams, always stereo and no loop.
+     * Some games fake looping by calling DVD commands to set position with certain timing.
+     * Though headerless, format is HW-wired to those specs. */
+    channels = 2;
     loop_flag = 0;
     start_offset = 0x00;
 
+
     /* build the VGMSTREAM */
-    vgmstream = allocate_vgmstream(channel_count, loop_flag);
+    vgmstream = allocate_vgmstream(channels, loop_flag);
     if (!vgmstream) goto fail;
 
-    vgmstream->num_samples = get_streamfile_size(streamFile) / 0x20 * 28;
+    vgmstream->num_samples = get_streamfile_size(sf) / 0x20 * 28;
     vgmstream->sample_rate = 48000; /* due to a GC hardware defect this may be closer to 48043 */
     vgmstream->coding_type = coding_NGC_DTK;
     vgmstream->layout_type = layout_none;
     vgmstream->meta_type = meta_NGC_ADPDTK;
 
-    if ( !vgmstream_open_stream(vgmstream, streamFile, start_offset) )
+    if ( !vgmstream_open_stream(vgmstream, sf, start_offset) )
         goto fail;
 
     return vgmstream;