avformat demux: fix h264 packetizing

modules/demux/avformat/demux.c

@@ -287,8 +287,8 @@ int OpenDemux( vlc_object_t *p_this )
                     fmt.i_codec = fmt.video.i_chroma;
             }
             /* We need this for the h264 packetizer */
-            else if( cc->codec_id == CODEC_ID_H264 && ( !strcmp( p_sys->fmt->name, "flv" ) ||
-                !strcmp( p_sys->fmt->name, "matroska" ) || !strcmp( p_sys->fmt->name, "mp4" ) ) )
+            else if( cc->codec_id == CODEC_ID_H264 && ( p_sys->fmt == av_find_input_format("flv") ||
+                p_sys->fmt == av_find_input_format("matroska") || p_sys->fmt == av_find_input_format("mp4") ) )
                 fmt.i_original_fourcc = VLC_FOURCC( 'a', 'v', 'c', '1' );
 
             fmt.video.i_width = cc->width;