GF_Err EncodeFileChunk(char *chunkFile, char *bifs, char *inputContext, char *outputContext, const char *tmpdir)
{
#if defined(GPAC_DISABLE_SMGR) || defined(GPAC_DISABLE_BIFS_ENC) || defined(GPAC_DISABLE_SCENE_ENCODER) || defined (GPAC_DISABLE_SCENE_DUMP)
	fprintf(stderr, "BIFS encoding is not supported in this build of GPAC\n");
	return GF_NOT_SUPPORTED;
#else
	GF_Err e;
	GF_SceneGraph *sg;
	GF_SceneManager	*ctx;
	GF_SceneLoader load;

	/*Step 1: create context and load input*/
	sg = gf_sg_new();
	ctx = gf_sm_new(sg);
	memset(&load, 0, sizeof(GF_SceneLoader));
	load.fileName = inputContext;
	load.ctx = ctx;
	/*since we're encoding we must get MPEG4 nodes only*/
	load.flags = GF_SM_LOAD_MPEG4_STRICT;
	e = gf_sm_load_init(&load);
	if (!e) e = gf_sm_load_run(&load);
	gf_sm_load_done(&load);
	if (e) {
		fprintf(stderr, "Cannot load context %s - %s\n", inputContext, gf_error_to_string(e));
		goto exit;
	}

	/* Step 2: make sure we have only ONE RAP for each stream*/
	e = gf_sm_aggregate(ctx, 0);
	if (e) goto exit;

	/*Step 3: loading the chunk into the context*/
	memset(&load, 0, sizeof(GF_SceneLoader));
	load.fileName = chunkFile;
	load.ctx = ctx;
	load.flags = GF_SM_LOAD_MPEG4_STRICT | GF_SM_LOAD_CONTEXT_READY;
	e = gf_sm_load_init(&load);
	if (!e) e = gf_sm_load_run(&load);
	gf_sm_load_done(&load);
	if (e) {
		fprintf(stderr, "Cannot load chunk context %s - %s\n", chunkFile, gf_error_to_string(e));
		goto exit;
	}
	fprintf(stderr, "Context and chunks loaded\n");

	/* Assumes that the first AU contains only one command a SceneReplace and
	   that is not part of the current chunk */
	/* Last argument is a callback to pass the encoded AUs: not needed here
	   Saving is not handled correctly */
	e = EncodeBIFSChunk(ctx, bifs, NULL);
	if (e) goto exit;


	if (outputContext) {
		u32 d_mode, do_enc;
		char szF[GF_MAX_PATH], *ext;

		/*make random access for storage*/
		e = gf_sm_aggregate(ctx, 0);
		if (e) goto exit;

		/*check if we dump to BT, XMT or encode to MP4*/
		strcpy(szF, outputContext);
		ext = strrchr(szF, '.');
		d_mode = GF_SM_DUMP_BT;
		do_enc = 0;
		if (ext) {
			if (!stricmp(ext, ".xmt") || !stricmp(ext, ".xmta")) d_mode = GF_SM_DUMP_XMTA;
			else if (!stricmp(ext, ".mp4")) do_enc = 1;
			ext[0] = 0;
		}

		if (do_enc) {
			GF_ISOFile *mp4;
			strcat(szF, ".mp4");
			mp4 = gf_isom_open(szF, GF_ISOM_WRITE_EDIT, tmpdir);
			e = gf_sm_encode_to_file(ctx, mp4, NULL);
			if (e) gf_isom_delete(mp4);
			else gf_isom_close(mp4);
		}
		else e = gf_sm_dump(ctx, szF, GF_FALSE, d_mode);
	}

exit:
	if (ctx) {
		sg = ctx->scene_graph;
		gf_sm_del(ctx);
		gf_sg_del(sg);
	}

	return e;

#endif /*defined(GPAC_DISABLE_BIFS_ENC) || defined(GPAC_DISABLE_SCENE_ENCODER) || defined (GPAC_DISABLE_SCENE_DUMP)*/

}

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.