Fix warnings

c_src/membrane_vpx_plugin/vpx_decoder.c

@@ -114,7 +114,7 @@ UNIFEX_TERM decode_frame(UnifexEnv *env, UnifexPayload *frame, State *state) {
   vpx_codec_iter_t iter = NULL;
   vpx_image_t *img = NULL;
   unsigned int frames_cnt = 0, max_frames = 2;
-  PixelFormat pixel_format;
+  PixelFormat pixel_format = PIXEL_FORMAT_I420;
   UnifexPayload **output_frames =
       unifex_alloc(max_frames * sizeof(*output_frames));
 

lib/membrane_vpx/decoder/vpx_decoder.ex

@@ -1,10 +1,15 @@
 defmodule Membrane.VPx.Decoder do
+  @moduledoc """
+  Common behaviors for VP8 and VP9 Decoders
+  """
   alias Membrane.{Buffer, VP8, VP9}
   alias Membrane.Element.CallbackContext
   alias Membrane.VPx.Decoder.Native
 
   defmodule State do
-    @moduledoc false
+    @moduledoc """
+    State of a decoder
+    """
     @type t :: %__MODULE__{
             codec: :vp8 | :vp9,
             codec_module: VP8 | VP9,