vble: Do not abort decoding when version is not 1

Some combinations of OS, VirtualDub, and VBLE can accidentally
set the version to a value other than 1. Since no other version
of VBLE was ever released, simply warn about it.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavcodec/vble.c

@@ -141,10 +141,8 @@ static int vble_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     /* Version should always be 1 */
     version = AV_RL32(src);
 
-    if (version != 1) {
-        av_log(avctx, AV_LOG_ERROR, "Unsupported VBLE Version: %d\n", version);
-        return AVERROR_INVALIDDATA;
-    }
+    if (version != 1)
+        av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version);
 
     init_get_bits(&gb, src + 4, (avpkt->size - 4) * 8);