Index: gpac-2.2.0/src/filters/ff_mx.c
===================================================================
--- gpac-2.2.0.orig/src/filters/ff_mx.c
+++ gpac-2.2.0/src/filters/ff_mx.c
@@ -503,7 +503,7 @@ static GF_Err ffmx_close_seg(GF_Filter *
 		evt.seg_size.is_init = 0;
 	}
 	evt.seg_size.media_range_start = ctx->offset_at_seg_start;
-	evt.seg_size.media_range_end = ctx->muxer->pb ? (ctx->muxer->pb->written-1) : 0;
+	evt.seg_size.media_range_end = ctx->muxer->pb ? (ctx->muxer->pb->bytes_written-1) : 0;
 	ctx->offset_at_seg_start = evt.seg_size.media_range_end;
 
 	gf_filter_pid_send_event(pid, &evt);
@@ -1013,8 +1013,8 @@ static GF_Err ffmx_configure_pid(GF_Filt
 		ff_codec_id = ffmpeg_codecid_from_gpac(codec_id, &ff_codec_tag);
 	}
 
-	if (ctx->muxer->oformat && ctx->muxer->oformat->query_codec) {
-		res = ctx->muxer->oformat->query_codec(ff_codec_id, 1);
+	if (ctx->muxer->oformat) {
+		res = avformat_query_codec(ctx->muxer->oformat, ff_codec_id, 1);
 		if (!res) {
 			GF_LOG(GF_LOG_ERROR, GF_LOG_CONTAINER, ("[FFMux] Codec %s not supported in container %s\n", gf_codecid_name(codec_id), ctx->muxer->oformat->name));
 			return GF_NOT_SUPPORTED;