CA2421788A1 - Regeneration of program clock reference data for mpeg transport streams - Google Patents
Regeneration of program clock reference data for mpeg transport streams Download PDFInfo
- Publication number
- CA2421788A1 CA2421788A1 CA002421788A CA2421788A CA2421788A1 CA 2421788 A1 CA2421788 A1 CA 2421788A1 CA 002421788 A CA002421788 A CA 002421788A CA 2421788 A CA2421788 A CA 2421788A CA 2421788 A1 CA2421788 A1 CA 2421788A1
- Authority
- CA
- Canada
- Prior art keywords
- transcoder
- timing data
- packet
- output
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2365—Multiplexing of several video streams
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
Abstract
A system for providing an accurate time reference for multiple input and output digital video signals of a transcoder (100) that is particularly suited for use with MPEG data. The multiple streams are synchronized with a single master system time clock (155) at the transcoder (100). Timing data from the master clock is compared to timing data from packets that are input to the transcoder to determine an offset (120, 130). In particular, timing data, such as a program clock reference (PCR) field, is recovered from packets (104) of different channels that are input to the transcoder (122, 132). For each channel, timing data is then provided for packets (106) that are output from the transcoder based on the offset and timing data of the master clock (155) at the respective output times. In particular, the adjusted timing data is determined as a sum of the offset and an associated hardware error, less a delay (PcrSysDla) associated with the transcoder, which includes a lookahead delay and a buffer delay. The associated hardware error represents an error of the master clock and/or a system time clock of an encoder that encoded the particular channel.
Claims (18)
1. A method for providing adjusted timing data for a plurality of respective channels that are input to a transcoder, comprising the steps of for each channel, recovering timing data (PcrIn) from at least one packet thereof that is input to the transcoder at a respective input time, and determining an associated offset (PcrOffset) between the recovered timing data (PcrIn) and timing data (PcrInHwTag) of a master system time clock of the transcoder at the respective input time; and for each channel, providing adjusted timing data (PcrOut) in at least one packet thereof that is output from the transcoder at a respective output time according to the associated offset (PcrOffset), and timing data (PcrOutHwTag) of the master system time clock at the respective output time.
2. The method of claim 1, wherein:
the recovered timing data comprises a program clock reference (PCR) field.
the recovered timing data comprises a program clock reference (PCR) field.
3. The method of claim 1, wherein:
the timing data of the master system time clock comprises a count based thereon.
the timing data of the master system time clock comprises a count based thereon.
4. The method of claim 1, wherein:
for at least one particular channel, the recovered timing data comprises a count based on a system time clock of an encoder that encoded the particular channel.
for at least one particular channel, the recovered timing data comprises a count based on a system time clock of an encoder that encoded the particular channel.
5. The method of claim 1, wherein:
for at least one particular channel, the adjusted timing data (PcrOut) is further provided in the at least one packet that is output from the transcoder according to a hardware error (PcrHwErr) associated with: (a) the master system time clock, and (b) a system time clock of an encoder that encoded the particular channel.
for at least one particular channel, the adjusted timing data (PcrOut) is further provided in the at least one packet that is output from the transcoder according to a hardware error (PcrHwErr) associated with: (a) the master system time clock, and (b) a system time clock of an encoder that encoded the particular channel.
6. The method of claim 5, wherein:
the hardware error (PcrHwErr) is associated with a frequency drift of at least one of the master system time clock and the system time clock of the encoder.
the hardware error (PcrHwErr) is associated with a frequency drift of at least one of the master system time clock and the system time clock of the encoder.
7. The method of claim 5, wherein:
the hardware error (PcrHwErr) is determined for the at least one packet that is output from the transcoder based on a rate of change of a hardware error associated with at least two packets that were previously input to the transcoder, and a time interval between: (a) the output time of the at least one packet that is output from the transcoder, and (b) an input time of a latter one of the two previous input packets.
the hardware error (PcrHwErr) is determined for the at least one packet that is output from the transcoder based on a rate of change of a hardware error associated with at least two packets that were previously input to the transcoder, and a time interval between: (a) the output time of the at least one packet that is output from the transcoder, and (b) an input time of a latter one of the two previous input packets.
8. The method of claim 1, wherein:
for at least one particular channel, the adjusted timing data (PcrOut) is further provided in the at least one packet that is output from the transcoder according to a delay (PcrSysDly) associated with the transcoder that includes a lookahead delay (lookahead_dly) and a buffer delay (buffer_dly).
for at least one particular channel, the adjusted timing data (PcrOut) is further provided in the at least one packet that is output from the transcoder according to a delay (PcrSysDly) associated with the transcoder that includes a lookahead delay (lookahead_dly) and a buffer delay (buffer_dly).
9. The method of claim 8, wherein:
the adjusted timing data (PcrOut) is further provided in the at least one packet that is output from the transcoder according to a sum of the associated offset and an associated hardware error (PcrHwErr), less the delay (PcrSysDly) associated with the transcoder; and the associated hardware error (PcrHwErr) is associated with: (a) the master system time clock and (b) a system time clock of an encoder that encoded the particular channel.
the adjusted timing data (PcrOut) is further provided in the at least one packet that is output from the transcoder according to a sum of the associated offset and an associated hardware error (PcrHwErr), less the delay (PcrSysDly) associated with the transcoder; and the associated hardware error (PcrHwErr) is associated with: (a) the master system time clock and (b) a system time clock of an encoder that encoded the particular channel.
10. The method of claim 8, wherein:
the lookahead delay (lookahead_dly) is based on a difference between decode and encode times of the transcoder.
the lookahead delay (lookahead_dly) is based on a difference between decode and encode times of the transcoder.
11. The method of claim 10, wherein:
the decode time is based on a decode time stamp.
the decode time is based on a decode time stamp.
12. The method of claim 10, wherein:
the encode time is based on the master system time clock.
the encode time is based on the master system time clock.
13. The method of claim 8, wherein:
the buffer delay (buffer_dly) is based on a difference between an encode time of the at least one packet at the transcoder and a corresponding subsequent decode time.
the buffer delay (buffer_dly) is based on a difference between an encode time of the at least one packet at the transcoder and a corresponding subsequent decode time.
14. The method of claim 13, wherein:
the encode time is based on the master system time clock.
the encode time is based on the master system time clock.
15. The method of claim 13, wherein:
the decode time is based on a decode time stamp.
the decode time is based on a decode time stamp.
16. The method of claim 1, wherein for at least one particular channel, at least one packet thereof is passed through the transcoder without being transcoded, comprising the further step of:
delaying the output of the passed through packet from the transcoder according to a delay of the transcoder to maintain synchronicity of the particular channel with other ones of the channels that are transcoded by the transcoder.
delaying the output of the passed through packet from the transcoder according to a delay of the transcoder to maintain synchronicity of the particular channel with other ones of the channels that are transcoded by the transcoder.
17. The method of claim 1, wherein:
the timing data of the master system time clock is appended to the at least one packet that is input to the transcoder while the at least one packet is in a multiplex of the channels; and the channels are demultiplexed prior to the determining of the associated offset (PcrOffset).
the timing data of the master system time clock is appended to the at least one packet that is input to the transcoder while the at least one packet is in a multiplex of the channels; and the channels are demultiplexed prior to the determining of the associated offset (PcrOffset).
18. An apparatus for providing adjusted timing data for a plurality of respective channels that are input to a transcoder, comprising:
means for recovering, for each channel, timing data (PcrIn) from at least one packet thereof that is input to the transcoder at a respective input time, and determining an associated offset (PcrOffset) between the recovered timing data (PcrIn) and timing data (PcrInHwTag) of a master system time clock of the transcoder at the respective input time; and means for providing, for each channel, adjusted timing data (PcrOut) in at least one packet thereof that is output from the transcoder at a respective output time according to the associated offset (PcrOffset), and timing data (PcrOutHwTag) of the master system time clock at the respective output time.
means for recovering, for each channel, timing data (PcrIn) from at least one packet thereof that is input to the transcoder at a respective input time, and determining an associated offset (PcrOffset) between the recovered timing data (PcrIn) and timing data (PcrInHwTag) of a master system time clock of the transcoder at the respective input time; and means for providing, for each channel, adjusted timing data (PcrOut) in at least one packet thereof that is output from the transcoder at a respective output time according to the associated offset (PcrOffset), and timing data (PcrOutHwTag) of the master system time clock at the respective output time.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/667,734 | 2000-09-22 | ||
| US09/667,734 US6724825B1 (en) | 2000-09-22 | 2000-09-22 | Regeneration of program clock reference data for MPEG transport streams |
| PCT/US2001/027191 WO2002025952A2 (en) | 2000-09-22 | 2001-08-31 | Regeneration of program clock reference data for mpeg transport streams |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2421788A1 true CA2421788A1 (en) | 2002-03-28 |
| CA2421788C CA2421788C (en) | 2011-05-03 |
Family
ID=24679412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2421788A Expired - Lifetime CA2421788C (en) | 2000-09-22 | 2001-08-31 | Regeneration of program clock reference data for mpeg transport streams |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US6724825B1 (en) |
| EP (1) | EP1323312B1 (en) |
| KR (1) | KR20030061808A (en) |
| CN (1) | CN1212737C (en) |
| AT (1) | ATE279073T1 (en) |
| AU (1) | AU8699001A (en) |
| CA (1) | CA2421788C (en) |
| DE (1) | DE60106286T2 (en) |
| MX (1) | MXPA03002418A (en) |
| TW (1) | TW533739B (en) |
| WO (1) | WO2002025952A2 (en) |
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-
2000
- 2000-09-22 US US09/667,734 patent/US6724825B1/en not_active Expired - Lifetime
-
2001
- 2001-08-10 TW TW090119638A patent/TW533739B/en not_active IP Right Cessation
- 2001-08-31 DE DE60106286T patent/DE60106286T2/en not_active Expired - Lifetime
- 2001-08-31 CA CA2421788A patent/CA2421788C/en not_active Expired - Lifetime
- 2001-08-31 KR KR10-2003-7004129A patent/KR20030061808A/en not_active Application Discontinuation
- 2001-08-31 CN CNB018193668A patent/CN1212737C/en not_active Expired - Lifetime
- 2001-08-31 MX MXPA03002418A patent/MXPA03002418A/en active IP Right Grant
- 2001-08-31 AT AT01966481T patent/ATE279073T1/en not_active IP Right Cessation
- 2001-08-31 EP EP01966481A patent/EP1323312B1/en not_active Expired - Lifetime
- 2001-08-31 AU AU8699001A patent/AU8699001A/en active Pending
- 2001-08-31 WO PCT/US2001/027191 patent/WO2002025952A2/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| US6724825B1 (en) | 2004-04-20 |
| AU8699001A (en) | 2002-04-02 |
| ATE279073T1 (en) | 2004-10-15 |
| CN1212737C (en) | 2005-07-27 |
| EP1323312A2 (en) | 2003-07-02 |
| DE60106286T2 (en) | 2005-10-13 |
| EP1323312B1 (en) | 2004-10-06 |
| KR20030061808A (en) | 2003-07-22 |
| WO2002025952A2 (en) | 2002-03-28 |
| TW533739B (en) | 2003-05-21 |
| MXPA03002418A (en) | 2004-02-12 |
| CN1476726A (en) | 2004-02-18 |
| WO2002025952A3 (en) | 2002-07-04 |
| DE60106286D1 (en) | 2004-11-11 |
| CA2421788C (en) | 2011-05-03 |
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|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20210831 |