NTS File Format - Revision history

Raydon at 16:58, 21 June 2018

2018-06-21T16:58:09Z

Raydon at 16:57, 21 June 2018

2018-06-21T16:57:32Z

Raydon at 16:19, 21 June 2018

2018-06-21T16:19:50Z

Prpr: Wrap to prevent excessive line length

2014-11-24T13:19:40Z

Wrap to prevent excessive line length

Ezra pound: Created page with "

 MPEG2 - 32 byte entries  Offset		Purpose                                      Value -------------------------------------------------------------------------------------..."

2014-11-24T11:47:16Z

Created page with "<pre> MPEG2 - 32 byte entries Offset Purpose Value -------------------------------------------------------------------------------------..."

New page

<pre>
MPEG2 - 32 byte entries

Offset Purpose Value
--------------------------------------------------------------------------------------------------------------
0x00 3 bytes Offset from Seq. header to current frame. Address of this frame minus address of Sequence header.
0x03 1 byte Frame Type 0x01 = I-Frame, 0x02 = P-Frame, 0x03 = B-Frame.
0x04 1 byte SD/HD flag 0x20 = SD.
0x05 1 byte Picture sequence frame count 0 to 12 (13 frames) for first count only, then 3 to 14 (12 frames) after that.
0x06 2 byte Offset from Seq. header to first frame. Address of first frame in Sequence minus address of Sequence header.
0x08 8 bytes Picture header address. Address of this frame.
0x10 4 bytes Presentation TimeStamp (PTS) The first 32 bits of PES PTS.
0x14 4 bytes Frame size. Address of next frame minus address of this frame.
0x18 4 bytes Played Time Played time in milliseconds.
0x1C 4 bytes Unused N/A

H264 - 64 byte entries

Offset Purpose Value
--------------------------------------------------------------------------------------------------------------
0x00 3 bytes Offset from PicParamSet to current SEI. Address of SEI preceding current frame minus address of last PicParamSet.
0x03 1 byte Frame Type 0x01 = I-Frame, 0x02 = P-Frame, 0x03 = B-Frame.
0x04 1 byte HD Flag 0x30 = HD.
0x05 1 byte Picture sequence frame count. Starts at zero for first count only, then starts at 1 after that. Consequently the last 0x08 entry of each count sequence contains the address of first SEI of the next sequence.
0x06 2 bytes Offset from PicParamSet to first SEI. Address of first SEI in sequence minus address of last PicParamSet.
0x08 8 bytes SEI address. Address of SEI preceding the frame.
0x10 4 bytes Presentation TimeStamp (PTS) The first 32 bits of PES PTS.
0x14 4 bytes Frame size. Address of the AUD immediately after frame minus address of SEI preceding the frame.
0x18 4 bytes Played Time. Played time in milliseconds for timebar display.
0x1C 4 bytes Unused N/A
0x20 4 bytes HeaderEndSize Address of SEI minus address of last SeqParamSet
0x24 4 bytes ExtDistance Address of last PicParamSet minus address of last SeqParamSet
0x28 24 bytes Unused N/A

All values are in reverse byte order (little endian)

File analysis by raydon
</pre>

@@ Line 7: / Line 7: @@
 x03  1 byte	Frame Type					0x01 = I-Frame, 0x02 = P-Frame, 0x03 = B-Frame.
 x04  1 byte	SD/HD flag					0x20 = SD.
-x05  1 byte	Picture sequence frame count			Starts at 0 for 1st count, then 3 thereafter. Resets on first P frame after an I-frame.
+x05  1 byte	Picture sequence frame count			Starts at 0 for 1st count, then 3 thereafter. Resets on first P-frame after an I-frame.
 x06  2 byte    Offset from Seq. header to first frame.		Address of first frame in Sequence minus address of Sequence header.
 x08  8 bytes	Picture header address.				Address of this frame.

@@ Line 7: / Line 7: @@
 x03  1 byte	Frame Type					0x01 = I-Frame, 0x02 = P-Frame, 0x03 = B-Frame.
 x04  1 byte	SD/HD flag					0x20 = SD.
-x05  1 byte	Picture sequence frame count			0 to 12 (13 frames) for first count only, then 3 to 14 (12 frames) after that.
+x05  1 byte	Picture sequence frame count			Starts at 0 for first count, then 3 thereafter. Resets after I-frame.
 x06  2 byte    Offset from Seq. header to first frame.		Address of first frame in Sequence minus address of Sequence header.
 x08  8 bytes	Picture header address.				Address of this frame.
@@ Line 23: / Line 23: @@
 x03  1 byte	Frame Type					0x01 = I-Frame, 0x02 = P-Frame, 0x03 = B-Frame.
 x04  1 byte	HD Flag						0x30 = HD.
-x05  1 byte	Picture sequence frame count.			Starts at zero for first count only, then starts at 1 after that. Consequently the last
+x05  1 byte	Picture sequence frame count.			Starts at 0 for first count, then 1 thereafter. Resets after I-frame.
 x06  2 bytes	Offset from PicParamSet to first SEI.		Address of first SEI in sequence minus address of last PicParamSet.
 x08  8 bytes	SEI address.					Address of SEI preceding the frame.