mpegaudiodec: Skip only bad frames instead of the whole packet.

On frame decoding failure, return an error if the frame is the same size as
the whole packet, otherwise just log an error message and return the number
of bytes consumed.

libavcodec/mpegaudiodec.c

@@ -1819,8 +1819,15 @@ static int decode_frame(AVCodecContext * avctx,
         *data_size = out_size;
         avctx->sample_rate = s->sample_rate;
         //FIXME maybe move the other codec info stuff from above here too
-    }else
-        av_log(avctx, AV_LOG_DEBUG, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
+        /* Only return an error if the bad frame makes up the whole packet.
+           If there is more data in the packet, just consume the bad frame
+           instead of returning an error, which would discard the whole
+           packet. */
+        if (buf_size == avpkt->size)
+            return out_size;
+    }
     s->frame_size = 0;
     return buf_size;
 }