diff --git a/cmd/camera.c b/cmd/camera.c
index 18ba4c9..3aa8ec3 100644
--- a/cmd/camera.c
+++ b/cmd/camera.c
@@ -9,13 +9,6 @@ void camera_init(camera_t *camera)
 {
   memset(camera, 0, sizeof(*camera));
   camera->name = "CAMERA";
-  strcpy(camera->options.path, "/dev/video0");
-  camera->options.width = 1280;
-  camera->options.height = 720;
-  camera->options.nbufs = 4;
-  camera->options.format = V4L2_PIX_FMT_SRGGB10P;
-  camera->options.allow_dma = true;
-  camera->options.fps = 30;
 }
 
 void camera_close(camera_t *camera)
@@ -32,13 +25,18 @@ void camera_close(camera_t *camera)
 
 int camera_open(camera_t *camera)
 {
-  camera->camera = device_open("CAMERA", camera->options.path);
+  camera->camera = device_open(camera->name, camera->options.path);
   if (!camera->camera) {
     return -1;
   }
 
   camera->camera->allow_dma = camera->options.allow_dma;
 
+  if (strstr(camera->camera->v4l2_cap.bus_info, "usb")) {
+    E_LOG_INFO(camera, "Disabling DMA since device uses USB (which is likely not working properly).");
+    camera->camera->allow_dma = false;
+  }
+
   if (device_open_buffer_list(camera->camera, true, camera->options.width, camera->options.height, camera->options.format, 0, camera->options.nbufs, true) < 0) {
     return -1;
   }
diff --git a/cmd/camera.h b/cmd/camera.h
index 23c91dd..1632d9b 100644
--- a/cmd/camera.h
+++ b/cmd/camera.h
@@ -13,6 +13,8 @@ typedef struct camera_options_s {
   unsigned width, height, format;
   unsigned nbufs, fps;
   bool allow_dma;
+  float high_res_factor;
+  float low_res_factor;
 } camera_options_t;
 
 typedef struct camera_s {
@@ -33,7 +35,9 @@ typedef struct camera_s {
       device_t *codec_h264; // encode YUVU into H264
     };
   };
+
   link_t links[MAX_DEVICES];
+  int nlinks;
 } camera_t;
 
 #define CAMERA(DEVICE) camera->devices[DEVICE]
diff --git a/cmd/main.c b/cmd/main.c
index 550efe0..4daae3a 100644
--- a/cmd/main.c
+++ b/cmd/main.c
@@ -28,7 +28,9 @@ camera_options_t camera_options = {
   .format = 0,
   .nbufs = 4,
   .fps = 30,
-  .allow_dma = true
+  .allow_dma = true,
+  .high_res_factor = 1.0,
+  .low_res_factor = 0.0,
 };
 
 http_server_options_t http_options = {
@@ -41,14 +43,25 @@ log_options_t log_options = {
   .verbose = false
 };
 
+option_value_t camera_formats[] = {
+  { "DEFAULT", 0 },
+  { "YUYV", V4L2_PIX_FMT_YUYV },
+  { "MJPEG", V4L2_PIX_FMT_MJPEG },
+  { "H264", V4L2_PIX_FMT_H264 },
+  { "RG10", V4L2_PIX_FMT_SRGGB10P },
+  {}
+};
+
 option_t all_options[] = {
-  DEFINE_OPTION_PTR(camera, path, "%s"),
+  DEFINE_OPTION_PTR(camera, path, string),
   DEFINE_OPTION(camera, width, uint),
   DEFINE_OPTION(camera, height, uint),
-  DEFINE_OPTION(camera, format, uint),
+  DEFINE_OPTION_VALUES(camera, format, camera_formats),
   DEFINE_OPTION(camera, nbufs, uint),
   DEFINE_OPTION(camera, fps, uint),
   DEFINE_OPTION(camera, allow_dma, bool),
+  DEFINE_OPTION(camera, high_res_factor, float),
+  DEFINE_OPTION(camera, low_res_factor, float),
   DEFINE_OPTION(http, port, uint),
   DEFINE_OPTION(http, maxcons, uint),
   DEFINE_OPTION(log, debug, bool),
diff --git a/hw/buffer_queue.c b/hw/buffer_queue.c
index d991b4e..f46e0cd 100644
--- a/hw/buffer_queue.c
+++ b/hw/buffer_queue.c
@@ -106,6 +106,9 @@ int buffer_list_enqueue(buffer_list_t *buf_list, buffer_t *dma_buf)
     return 0;
   }
 
+  buf->v4l2_buffer.flags &= ~V4L2_BUF_FLAG_KEYFRAME;
+  buf->v4l2_buffer.flags |= dma_buf->v4l2_buffer.flags & V4L2_BUF_FLAG_KEYFRAME;
+
   if (buf_list->do_mmap) {
     if (dma_buf->used > buf->length) {
       E_LOG_INFO(buf_list, "The dma_buf (%s) is too long: %zu vs space=%zu",
diff --git a/opts/opts.c b/opts/opts.c
index a338b6f..9785700 100644
--- a/opts/opts.c
+++ b/opts/opts.c
@@ -7,13 +7,24 @@
 static void print_help(option_t *options)
 {
   for (int i = 0; options[i].name; i++) {
-    printf("%20s ", options[i].name);
+    option_t *option = &options[i];
+    printf("%40s\t", option->name);
 
-    if (options[i].ptr) {
-      printf(options[i].format, options[i].ptr);
+    if (option->value_string) {
+      printf(option->format, option->value_string);
+    } else if (option->value_mapping) {
+      for (int j = 0; option->value_mapping[j].name; j++) {
+        if (option->value_mapping[j].value == *option->value) {
+          printf("%s - ", option->value_mapping[j].name);
+          break;
+        }
+      }
+
+      printf(option->format, *option->value);
     } else {
-      printf(options[i].format, *options[i].value);
+      printf(option->format, *option->value);
     }
+
     printf("\n");
   }
 }
@@ -34,8 +45,17 @@ static int parse_opt(option_t *options, const char *key, const char *value)
   }
 
   int ret = 0;
-  if (option->ptr) {
-    ret = sscanf(value, option->format, option->ptr);
+  if (option->value_string) {
+    ret = sscanf(value, option->format, option->value_string);
+  } else if (option->value_mapping) {
+    for (int j = 0; option->value_mapping[j].name; j++) {
+      if (!strcmp(option->value_mapping[j].name, value)) {
+        *option->value_uint = option->value_mapping[j].value;
+        return 1;
+      }
+    }
+
+    ret = sscanf(value, option->format, option->value);
   } else {
     ret = sscanf(value, option->format, option->value);
   }
diff --git a/opts/opts.h b/opts/opts.h
index 084629c..e3db6db 100644
--- a/opts/opts.h
+++ b/opts/opts.h
@@ -2,16 +2,24 @@
 
 #include <stdbool.h>
 
+typedef struct option_value_s {
+  const char *name;
+  unsigned value;
+} option_value_t;
+
 typedef struct options_s {
   const char *name;
-  void *ptr;
+  char *value_string;
   union {
     unsigned *value;
     unsigned *value_uint;
+    unsigned *value_hex;
     bool *value_bool;
+    float *value_float;
   };
   const char *format;
   const char *help;
+  option_value_t *value_mapping;
   unsigned size;
 } option_t;
 
@@ -21,8 +29,11 @@ typedef struct options_s {
           __fn__; \
 })
 
-#define OPTION_FORMAT_uint "%d"
-#define OPTION_FORMAT_bool "%d"
+#define OPTION_FORMAT_uint   "%d"
+#define OPTION_FORMAT_hex    "%08x"
+#define OPTION_FORMAT_bool   "%d"
+#define OPTION_FORMAT_float  "%.1f"
+#define OPTION_FORMAT_string "%s"
 
 #define DEFINE_OPTION(_section, _name, _type) \
   { \
@@ -32,11 +43,20 @@ typedef struct options_s {
     .size = sizeof(_section##_options._name), \
   }
 
-#define DEFINE_OPTION_PTR(_section, _name, _format) \
+#define DEFINE_OPTION_VALUES(_section, _name, _value_mapping) \
   { \
     .name = #_section "-" #_name, \
-    .ptr = _section##_options._name, \
-    .format = _format, \
+    .value_hex = &_section##_options._name, \
+    .format = OPTION_FORMAT_hex, \
+    .value_mapping = _value_mapping, \
+    .size = sizeof(_section##_options._name), \
+  }
+
+#define DEFINE_OPTION_PTR(_section, _name, _type) \
+  { \
+    .name = #_section "-" #_name, \
+    .value_##_type = _section##_options._name, \
+    .format = OPTION_FORMAT_##_type, \
     .size = sizeof(_section##_options._name), \
   }