diff --git a/video/out/gpu/ra.c b/video/out/gpu/ra.c
index 855f9b6bb20a8..e310a6be7a486 100644
--- a/video/out/gpu/ra.c
+++ b/video/out/gpu/ra.c
@@ -300,23 +300,30 @@ bool ra_get_imgfmt_desc(struct ra *ra, int imgfmt, struct ra_imgfmt_desc *out)
         res.num_planes = regfmt.num_planes;
         res.component_bits = regfmt.component_size * 8;
         res.component_pad = regfmt.component_pad;
+        MP_DBG(ra, "Found %d planes for format %s.\n", res.num_planes, mp_imgfmt_to_name(imgfmt));
         for (int n = 0; n < regfmt.num_planes; n++) {
             struct mp_regular_imgfmt_plane *plane = &regfmt.planes[n];
             res.planes[n] = find_plane_format(ra, regfmt.component_size,
                                               plane->num_components,
                                               regfmt.component_type);
-            if (!res.planes[n])
+            if (!res.planes[n]) {
+                MP_DBG(ra, "No planes found for format: %s\n", mp_imgfmt_to_name(imgfmt));
                 return false;
+            }
             for (int i = 0; i < plane->num_components; i++)
                 res.components[n][i] = plane->components[i];
             // Dropping LSBs when shifting will lead to dropped MSBs.
             if (res.component_bits > res.planes[n]->component_depth[0] &&
-                res.component_pad < 0)
+                res.component_pad < 0) {
+                MP_DBG(ra, "Bad LSB/MSB shifting for format: %s\n", mp_imgfmt_to_name(imgfmt));
                 return false;
+            }
             // Renderer restriction, but actually an unwanted corner case.
             if (res.component_type != RA_CTYPE_UNKNOWN &&
-                res.component_type != res.planes[n]->ctype)
+                res.component_type != res.planes[n]->ctype) {
+                MP_DBG(ra, "RA_CTYPE_UNKNOWN edgecase for format: %s\n", mp_imgfmt_to_name(imgfmt));
                 return false;
+            }
             res.component_type = res.planes[n]->ctype;
         }
         res.chroma_w = 1 << regfmt.chroma_xs;
@@ -332,6 +339,7 @@ bool ra_get_imgfmt_desc(struct ra *ra, int imgfmt, struct ra_imgfmt_desc *out)
     }
 
     // Unsupported format
+    MP_DBG(ra, "Format, %s\n, is not supported.", mp_imgfmt_to_name(imgfmt));
     return false;
 
 supported:
diff --git a/video/out/gpu/video.c b/video/out/gpu/video.c
index 037d93ca2623d..1a6294ef40685 100644
--- a/video/out/gpu/video.c
+++ b/video/out/gpu/video.c
@@ -4093,14 +4093,18 @@ bool gl_video_showing_interpolated_frame(struct gl_video *p)
     return p->is_interpolated;
 }
 
-static bool is_imgfmt_desc_supported(struct gl_video *p,
+static bool is_imgfmt_desc_supported(struct gl_video *p, int mp_format,
                                      const struct ra_imgfmt_desc *desc)
 {
-    if (!desc->num_planes)
+    if (!desc->num_planes) {
+        MP_DBG(p, "No planes found for format: %s\n", mp_imgfmt_to_name(mp_format));
         return false;
+    }
 
-    if (desc->planes[0]->ctype == RA_CTYPE_UINT && p->forced_dumb_mode)
+    if (desc->planes[0]->ctype == RA_CTYPE_UINT && p->forced_dumb_mode) {
+        MP_DBG(p, "RA_CTYPE_UNIT and dumb mode for: %s\n", mp_imgfmt_to_name(mp_format));
         return false;
+    }
 
     return true;
 }
@@ -4109,7 +4113,7 @@ bool gl_video_check_format(struct gl_video *p, int mp_format)
 {
     struct ra_imgfmt_desc desc;
     if (ra_get_imgfmt_desc(p->ra, mp_format, &desc) &&
-        is_imgfmt_desc_supported(p, &desc))
+        is_imgfmt_desc_supported(p, mp_format, &desc))
         return true;
     if (ra_hwdec_get(&p->hwdec_ctx, mp_format))
         return true;
diff --git a/video/out/vo_gpu_next.c b/video/out/vo_gpu_next.c
index 74b8620307ad2..baa7c4ed95832 100644
--- a/video/out/vo_gpu_next.c
+++ b/video/out/vo_gpu_next.c
@@ -1194,6 +1194,7 @@ static int query_format(struct vo *vo, int format)
     if (!planes)
         return false;
 
+    MP_DBG(vo, "Found %d planes for format %s.\n", planes, mp_imgfmt_to_name(format));
     for (int i = 0; i < planes; i++) {
         if (!pl_plane_find_fmt(p->gpu, NULL, &data[i]))
             return false;