diff --git a/common.h b/common.h
index f6436ae..4837505 100644
--- a/common.h
+++ b/common.h
@@ -259,7 +259,7 @@ typedef struct
     int64_t video_dts;
 
     //sdt_program_ctx_t *sdt_ctx;
-    int cablelabs_is_3d;
+    int is_3dtv;
 
     int sb_leak_rate;
     int sb_size;
diff --git a/libmpegts.c b/libmpegts.c
index da69414..6930ff7 100644
--- a/libmpegts.c
+++ b/libmpegts.c
@@ -150,7 +150,7 @@ int ts_setup_transport_stream( ts_writer_t *w, ts_main_t *params )
     cur_program->pmt.pid = params->programs[0].pmt_pid;
     cur_program->program_num = params->programs[0].program_num;
 
-    cur_program->cablelabs_is_3d = params->programs[0].cablelabs_is_3d;
+    cur_program->is_3dtv = params->programs[0].is_3dtv;
     cur_program->sb_leak_rate = params->programs[0].sb_leak_rate;
     cur_program->sb_size = params->programs[0].sb_size;
     cur_program->video_dts = -1;
@@ -1088,7 +1088,7 @@ static void write_video_stream_descriptor( bs_t *s, ts_int_stream_t *stream )
     bs_write( s, 5, 0x1f ); // reserved
 }
 #endif
-static void write_avc_descriptor( bs_t *s, ts_int_stream_t *stream )
+static void write_avc_descriptor( bs_t *s, ts_int_program_t *program, ts_int_stream_t *stream )
 {
     bs_write( s, 8, AVC_DESCRIPTOR_TAG ); // descriptor_tag
     bs_write( s, 8, 0x04 );               // descriptor_length
@@ -1113,7 +1113,8 @@ static void write_avc_descriptor( bs_t *s, ts_int_stream_t *stream )
     bs_write( s, 8, stream->mpegvideo_ctx->level & 0xff ); // level_idc
     bs_write( s, 1, 0 );    // AVC_still_present
     bs_write( s, 1, 0 );    // AVC_24_hour_picture_flag
-    bs_write( s, 6, 0x3f ); // reserved
+    bs_write( s, 1, !program->is_3dtv ); // Frame_Packing_SEI_not_present_flag
+    bs_write( s, 5, 0x1f ); // reserved
 }
 
 static void write_data_stream_alignment_descriptor( bs_t *s )
@@ -1499,7 +1500,7 @@ static int write_pmt( ts_writer_t *w, ts_int_program_t *program )
          }
          else if( stream->stream_format == LIBMPEGTS_VIDEO_AVC )
          {
-             write_avc_descriptor( &q, stream );
+             write_avc_descriptor( &q, program, stream );
              if( w->ts_type == TS_TYPE_BLU_RAY )
                  write_hdmv_video_registration_descriptor( &q, stream );
          }
@@ -1511,7 +1512,7 @@ static int write_pmt( ts_writer_t *w, ts_int_program_t *program )
          else if( stream->stream_format == LIBMPEGTS_AUDIO_ADTS || stream->stream_format == LIBMPEGTS_AUDIO_LATM )
          {
              /* strictly speaking in DVB only LATM is allowed for MPEG-4 AAC audio. ADTS is commonly used however */
-             if( stream->aac_is_mpeg4 )
+             if( !stream->aac_is_mpeg4 )
                  write_mpeg2_aac_descriptor( &q, stream );
              else if( w->ts_type == TS_TYPE_DVB )
                  write_aac_descriptor( &q, stream );
diff --git a/libmpegts.h b/libmpegts.h
index 8149f6d..31a3986 100644
--- a/libmpegts.h
+++ b/libmpegts.h
@@ -37,7 +37,7 @@
 /**** Stream Formats ****/
 /* Generic */
 #define LIBMPEGTS_VIDEO_MPEG2 1
-#define LIBMPEGTS_VIDEO_AVC  2
+#define LIBMPEGTS_VIDEO_AVC   2
 
 #define LIBMPEGTS_AUDIO_MPEG1 32
 #define LIBMPEGTS_AUDIO_MPEG2 33
@@ -268,7 +268,7 @@ typedef struct
     int num_streams;
     ts_stream_t *streams;
 
-    int cablelabs_is_3d;
+    int is_3dtv;
 
     int sb_leak_rate;
     int sb_size;
@@ -602,11 +602,13 @@ typedef struct
 
 int ts_write_frames( ts_writer_t *w, ts_frame_t *frames, int num_frames, uint8_t **out, int *len );
 
-/* 
+/* INACTIVE
  *
  * */
 int ts_delete_stream( ts_writer_t *w, int pid );
 
+
+
 int ts_close_writer( ts_writer_t *w );
 
 /* Examples TODO */