GF_Err EncodeBIFSChunk(GF_SceneManager *ctx, char *bifsOutputFile, GF_Err (*AUCallback)(GF_ISOSample *))
{
	GF_Err			e;
	char *data;
	u32 data_len;
	GF_BifsEncoder *bifsenc;
	GF_InitialObjectDescriptor *iod;
	u32 i, j, count;
	GF_StreamContext *sc;
	GF_ESD *esd;
	Bool encode_names, delete_bcfg;
	GF_BIFSConfig *bcfg;
	GF_AUContext		*au;
	char szRad[GF_MAX_PATH], *ext;
	char szName[1024];
	FILE *f;

	strcpy(szRad, bifsOutputFile);
	ext = strrchr(szRad, '.');
	if (ext) ext[0] = 0;


	/* step3: encoding all AUs in ctx->streams starting at AU index 1 (0 is SceneReplace from previous context) */
	bifsenc = gf_bifs_encoder_new(ctx->scene_graph);
	e = GF_OK;

	iod = (GF_InitialObjectDescriptor *) ctx->root_od;
	/*if no iod check we only have one bifs*/
	if (!iod) {
		count = 0;
		for (i=0; i<gf_list_count(ctx->streams); i++) {
			sc = gf_list_get(ctx->streams, i);
			if (sc->streamType == GF_STREAM_OD) count++;
		}
		if (!iod && count>1) return GF_NOT_SUPPORTED;
	}

	count = gf_list_count(ctx->streams);
	for (i=0; i<count; i++) {
		u32 nbb;
		GF_StreamContext *sc = gf_list_get(ctx->streams, i);
		esd = NULL;
		if (sc->streamType != GF_STREAM_SCENE) continue;

		esd = NULL;
		if (iod) {
			for (j=0; j<gf_list_count(iod->ESDescriptors); j++) {
				esd = gf_list_get(iod->ESDescriptors, j);
				if (esd->decoderConfig && esd->decoderConfig->streamType == GF_STREAM_SCENE) {
					if (!sc->ESID) sc->ESID = esd->ESID;
					if (sc->ESID == esd->ESID) {
						break;
					}
				}
				/*special BIFS direct import from NHNT*/
				else if (gf_list_count(iod->ESDescriptors)==1) {
					sc->ESID = esd->ESID;
					break;
				}
				esd = NULL;
			}
		}

		if (!esd) {
			esd = gf_odf_desc_esd_new(2);
			if (!esd) return GF_OUT_OF_MEM;
			gf_odf_desc_del((GF_Descriptor *) esd->decoderConfig->decoderSpecificInfo);
			esd->decoderConfig->decoderSpecificInfo = NULL;
			esd->ESID = sc->ESID;
			esd->decoderConfig->streamType = GF_STREAM_SCENE;
		}
		if (!esd->decoderConfig) return GF_OUT_OF_MEM;

		/*should NOT happen (means inputctx is not properly setup)*/
		if (!esd->decoderConfig->decoderSpecificInfo) {
			bcfg = (GF_BIFSConfig*)gf_odf_desc_new(GF_ODF_BIFS_CFG_TAG);
			delete_bcfg = 1;
		}
		/*regular retrieve from ctx*/
		else if (esd->decoderConfig->decoderSpecificInfo->tag == GF_ODF_BIFS_CFG_TAG) {
			bcfg = (GF_BIFSConfig *)esd->decoderConfig->decoderSpecificInfo;
			delete_bcfg = 0;
		}
		/*should not happen either (unless loading from MP4 in which case BIFSc is not decoded)*/
		else {
			bcfg = gf_odf_get_bifs_config(esd->decoderConfig->decoderSpecificInfo, esd->decoderConfig->objectTypeIndication);
			delete_bcfg = 1;
		}
		/*NO CHANGE TO BIFSC otherwise the generated update will not match the input context*/
		nbb = GetNbBits(ctx->max_node_id);
		if (!bcfg->nodeIDbits) bcfg->nodeIDbits=nbb;
		if (bcfg->nodeIDbits<nbb) fprintf(stderr, "Warning: BIFSConfig.NodeIDBits TOO SMALL\n");

		nbb = GetNbBits(ctx->max_route_id);
		if (!bcfg->routeIDbits) bcfg->routeIDbits = nbb;
		if (bcfg->routeIDbits<nbb) fprintf(stderr, "Warning: BIFSConfig.RouteIDBits TOO SMALL\n");

		nbb = GetNbBits(ctx->max_proto_id);
		if (!bcfg->protoIDbits) bcfg->protoIDbits=nbb;
		if (bcfg->protoIDbits<nbb) fprintf(stderr, "Warning: BIFSConfig.ProtoIDBits TOO SMALL\n");

		/*this is the real pb, not stored in cfg or file level, set at EACH replaceScene*/
		encode_names = 0;

		/* The BIFS Config that is passed here should be the BIFSConfig from the IOD */
		gf_bifs_encoder_new_stream(bifsenc, sc->ESID, bcfg, encode_names, 0);
		if (delete_bcfg) gf_odf_desc_del((GF_Descriptor *)bcfg);

		/*setup MP4 track*/
		if (!esd->slConfig) esd->slConfig = (GF_SLConfig *) gf_odf_desc_new(GF_ODF_SLC_TAG);
		if (sc->timeScale) esd->slConfig->timestampResolution = sc->timeScale;
		if (!esd->slConfig->timestampResolution) esd->slConfig->timestampResolution = 1000;
		esd->ESID = sc->ESID;
		gf_bifs_encoder_get_config(bifsenc, sc->ESID, &data, &data_len);

		if (esd->decoderConfig->decoderSpecificInfo) gf_odf_desc_del((GF_Descriptor *) esd->decoderConfig->decoderSpecificInfo);
		esd->decoderConfig->decoderSpecificInfo = (GF_DefaultDescriptor *) gf_odf_desc_new(GF_ODF_DSI_TAG);
		esd->decoderConfig->decoderSpecificInfo->data = data;
		esd->decoderConfig->decoderSpecificInfo->dataLength = data_len;
		esd->decoderConfig->objectTypeIndication = gf_bifs_encoder_get_version(bifsenc, sc->ESID);

		for (j=1; j<gf_list_count(sc->AUs); j++) {
			char *data;
			u32 data_len;
			au = gf_list_get(sc->AUs, j);
			e = gf_bifs_encode_au(bifsenc, sc->ESID, au->commands, &data, &data_len);
			if (data) {
				sprintf(szName, "%s%02d.bifs", szRad, j);
				f = gf_fopen(szName, "wb");
				gf_fwrite(data, data_len, 1, f);
				gf_fclose(f);
				gf_free(data);
			}
		}
	}
	gf_bifs_encoder_del(bifsenc);
	return e;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.