avcodec: map AV_CODEC_ID_NONE

(cherry picked from commit 97ef3628415ece0ee2931e70cab424d5446eb64b)

modules/codec/avcodec/avcodec.c

@@ -263,7 +263,8 @@ static int OpenDecoder( vlc_object_t *p_this )
 
     /* *** determine codec type *** */
     if( !GetFfmpegCodec( p_dec->fmt_in.i_codec, &i_cat, &i_codec_id,
-                             &psz_namecodec ) )
+                             &psz_namecodec )
+     || i_cat == UNKNOWN_ES )
     {
         return VLC_EGENERIC;
     }

modules/codec/avcodec/encoder.c

@@ -281,6 +281,9 @@ int OpenEncoder( vlc_object_t *p_this )
         psz_namecodec = "Raw video";
     }
 
+    if( i_cat == UNKNOWN_ES )
+        return VLC_EGENERIC;
+
     if( p_enc->fmt_out.i_cat == VIDEO_ES && i_cat != VIDEO_ES )
     {
         msg_Err( p_enc, "\"%s\" is not a video encoder", psz_namecodec );

modules/codec/avcodec/fourcc.c

@@ -43,6 +43,8 @@ static const struct
     int i_cat;
 } codecs_table[] =
 {
+    { 0, AV_CODEC_ID_NONE, UNKNOWN_ES },
+
     /*
      * Video Codecs
      */

modules/demux/avformat/mux.c

@@ -180,7 +180,8 @@ static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
 
     msg_Dbg( p_mux, "adding input" );
 
-    if( !GetFfmpegCodec( fmt->i_codec, 0, &i_codec_id, 0 ) )
+    if( !GetFfmpegCodec( fmt->i_codec, 0, &i_codec_id, 0 )
+     || i_codec_id == AV_CODEC_ID_NONE )
     {
         msg_Dbg( p_mux, "couldn't find codec for fourcc '%4.4s'",
                  (char *)&fmt->i_codec );