Packetized Elementary Stream Headers

http://dvd.sourceforge.net/dvdinfo/pes-hdr.html

Packetized Elementary Stream Headers

Depending on the Stream ID, a Packetized Elementary Stream (PES) header may contain various components.

The header

byte 0byte 1byte 2byte 3byte 4byte 50000 0000 0000 0000 0000 0001
Start codeStream IDPES packet lengthStream ID's which pertain to DVDStream IDStream typeextension present?1011 1101
0xBDPrivate stream 1 (non MPEG audio, subpictures)Yes1011 1110
0xBEPadding streamNo1011 1111
0xBFPrivate stream 2 (navigation data)No110x xxxx
0xC0 - 0xDFMPEG-1 or MPEG-2 audio stream number x xxxx
note: DVD allows only 8 audio streamsYes1110 xxxx
0xE0 - 0xEFMPEG-1 or MPEG-2 video stream number xxxx
note: DVD allows only 1 video streamYes

The extension

byte 6byte 7byte 876543210765432107654321010PES scrambling controlPES prioritydata alignment indicatorcopyrightoriginal or copyPTS DTS flagsESCR flagES rate flagDSM trick mode flagadditional copy info flagPES CRC flagPES extension flagPES header data lengthThe bit fields of the basic extension:

PES scrambling control -- 00 = not scrambled, others are user defined.

PES priority -- provides 2 priority levels, 0 and 1.

data alignment indicator -- if set to 1 indicates that the PES packet header is immediately followed by the video start code or audio syncword.

copyright -- 1 = packet contains copyrighted material.

original or copy -- 1 = original, 0 = copy.

PTS DTS flags -- Presentation Time Stamp / Decode Time Stamp. 00 = no PTS or DTS data present, 01 is forbidden.
if set to 10 the following data is appended to the header data field:

76543210765432107654321076543210765432100010PTS 32..301PTS 29..151PTS 14..001PTS DTS flags -- if set to 11 the following data is appended to the header data field:76543210765432107654321076543210765432100011PTS 32..301PTS 29..151PTS 14..0010001DTS 32..301DTS 29..151DTS 14..001presentation and decoder time stamps use the 90KHz clock (SCR / 300)

ESCR -- if set to 1 the following data is appended to the header data field:

76543210765432107654321076543210765432107654321000ESCR base 32..301ESCR base 29..151ESCR base 14..001ESCR ext1This is the Elementary Stream Clock Reference, used if the stream and system levels are not synchronized (i.e. ESCR differs from SCR in the PACK header).

ES rate -- if set to 1 the following data is appended to the header data field:

7654321076543210765432101ES rate1The rate at which data is delivered for this stream, in units of 50 bytes/second.

DSM trick mode - not used by DVD

additional copy info -- if set to 1 the following data is appended to the header data field:

765432101additional copy info

PES CRC flag -- if set to 1 the following data is appended to the header data field:

7654321076543210previous PES packet CRCThe polynomial used is X¹⁶ + X¹² + X⁵ + 1

PES extension flag -- if set to 1 the following data is appended to the header data field:

76543210PES private data flagpack header field flagprogram packet sequence counter flagP-STD buffer flag111PES extension flag 2The bit fields of the first extension:

PES private data flag -- if set to 1 16 bytes of user defined data is appended to the header data field.

pack header field flag -- if set to 1 the 8-bit pack field length value is appended to the header data field.

program packet sequence counter flag -- if set to 1 the following data is appended to the header data field:

76543210765432101packet sequence counter1MPEG1_MPEG2 identifieroriginal stuffing length

P-STD buffer flag -- if set to 1 the following data is appended to the header data field:

765432107654321001P-STD buffer scale
0 = 128 bytes
1 = 1024 bytesP-STD buffer size

PES extension flag 2 -- if set to 1 the following data is appended to the header data field:

76543210765432101PES extension field lengthreservedWhich is then followed by the indicated number of bytes.

The rest of the packet

Following all the extension data are optional stuffing bytes (0xFF), which are included in the header data length, and then the payload.
In the case of private streams the first byte of the payload is the sub-stream number.

DVD-Video home