CN101521786A - High definition transcoding method based on digital television HDTV platform - Google Patents
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Abstract
The invention discloses a high definition transcoding method based on a digital television HDTV platform, which comprises the following steps: extracting a transmission stream TS from a received digital television signal; detecting a coding form of the extracted TS; decoding the extracted TS according to the detected coding form to obtain a decoded signal; and processing the decoded signal according to an appointed coding form. The method realizes compatibility between high definition programs with different coding forms and compatibility between high definition devices with different coding forms.
Description
Technical Field
The invention relates to transcoding of a digital television in the broadcast television industry, in particular to a high-definition transcoding method based on a digital television HDTV platform.
Background
The digital television network in China has been initially scaled through the rapid development in recent years, and the digitization of television programs will be fully realized in the near future. To promote the development of digital television technology and industry, the national broadcast television bureau is also accelerating the overall conversion work of cable television digital broadcasting (DVB).
The digital television network is mainly used for transmitting high-definition programs, the coding format of the high-definition programs can adopt any one of MPEG-2, H.264, VC-1 and AVS, the high-definition programs adopting different coding formats need to be transmitted by different transmission equipment, and the different transmission equipment cannot be connected and transmitted.
Disclosure of Invention
The invention provides a high-definition transcoding method based on a digital television HDTV platform, which realizes compatibility between high-definition programs with different coding formats and compatibility between high-definition equipment with different coding formats.
The invention provides a high definition transcoding method based on a digital television HDTV platform, which comprises the following steps:
extracting a transport stream TS from the received digital television signal;
detecting an encoding format of the extracted TS;
decoding the extracted TS according to the detected coding format to obtain a decoded signal;
the decoded signal is processed according to a specified encoding format.
Further, the extracting TS from the received digital television signal includes:
demultiplexing the received digital television signal to obtain a demultiplexed TS;
and extracting the TS of the required coding program from the demultiplexed TS to be used as the extracted TS.
Further, the decoding the extracted TS according to the detected encoding format to obtain a decoded signal includes:
and decoding the extracted TS according to the detected coding format to obtain a high-definition image as a decoded signal.
Further, the decoding the extracted TS according to the detected encoding format to obtain a decoded signal includes:
decoding the extracted TS according to the detected coding format to obtain a high-definition image;
and carrying out image processing on the high-definition image to obtain a decoded signal.
Further, the image processing of the high-definition image includes:
carrying out mosaic processing on the high-definition image; and/or the presence of a gas in the gas,
and inserting icons and/or pictures into the high-definition images.
Further, the processing the decoded signal according to the specified encoding format includes:
encoding the decoded signal according to a specified encoding format, and outputting a basic data stream ES;
and packing the ES into TS.
Further, the processing the decoded signal according to the specified encoding format includes:
encoding the decoded signal according to a specified encoding format, and outputting a basic data stream ES;
and packing the ES into TS.
Further, the processing the decoded signal according to the specified encoding format further includes:
and multiplexing the TS obtained by packaging with the TS of other programs in the TS after demultiplexing.
Further, the detected encoding format at least comprises one of H.264, AVS and VC-1, and the specified encoding format is MPEG-2.
Further, the detected encoding format at least comprises one of MPEG-2, AVS and VC-1, and the specified encoding format is H.264.
Drawings
Fig. 1 shows a first embodiment of the high definition transcoding method based on a digital television HDTV platform according to the present invention;
fig. 2 shows a first embodiment of a high definition transcoder of the invention based on a digital television HDTV platform;
fig. 3 is a schematic diagram illustrating an application of the high definition transcoder based on a digital television HDTV platform of the present invention connected to an external device;
FIG. 4 shows an 8-way application of the high definition transcoder of the present invention based on the digital television HDTV platform;
fig. 5 shows the work flow of any module in 8 channels of the high definition transcoder based on the digital television HDTV platform.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Referring to fig. 1, fig. 1 shows a first embodiment of a high definition transcoding method based on a digital television HDTV platform, which includes:
101. the transport stream TS is extracted from the received digital television signal.
Digital television signals are received from a video server, a multiplexer, an encoder, and a satellite receiver through an Asynchronous Serial Interface (ASI) or an Internet Protocol (IP) interface. The video server is used for outputting a high-definition compressed program according to the configuration requirement of an operator in a mode of transmitting a data Stream (TS). And the multiplexer is used for multiplexing and redistributing the external high-definition compression coding based TS. And the encoder is used for compressing the high-definition lossless program source into the TS based on the high-definition compression coding.
Specifically, the step may include:
101-1, demultiplexing the received digital television signal to obtain a demultiplexed TS;
101-2, extracting TS of the needed coding program from the demultiplexed TS as extracted TS.
The demultiplexed TS may be directly used as the extracted TS, or a part of the demultiplexed TS may be used as the extracted TS, where the part is the TS of the program to be encoded.
And after the TS is extracted, monitoring and alarming of the TS can be carried out. Specifically, whether errors exist in the first stage and the second stage of the TS can be analyzed, the analysis result is packaged and stored, and the analysis result is displayed in a network management interface; if the error exists, an alarm is given at the same time.
102. The encoding format of the extracted TS is detected. The detected encoding format includes, but is not limited to, one of H.264, AVS, VC-1, and MPEG-2.
103. And decoding the extracted TS according to the detected coding format to obtain a decoded signal.
And decoding the extracted TS according to the detected coding format to obtain a high-definition image as a decoded signal.
The high-definition image may be further subjected to image processing, and the processed image may be used as a decoded signal. Specifically, the image processing may include:
carrying out mosaic processing on the high-definition image; and/or the presence of a gas in the gas,
and inserting icons and/or pictures into the high-definition images.
104. The decoded signal is processed according to a specified encoding format.
The specified encoding format includes, but is not limited to, one of H.264, AVS, VC-1, and MPEG-2.
Specifically, if the demultiplexed TS is directly used as the extracted TS, step 104 may include:
104-1, coding the decoded signal according to a specified coding format, and outputting a basic data stream ES;
104-2, packing the ES into TS.
If a part of the demultiplexed TS is taken as an extracted TS, step 104 may include:
encoding the decoded signal according to a specified encoding format, and outputting a basic data stream ES;
packing the ES into TS;
and multiplexing the TS obtained by packaging with the TS of other programs in the TS after demultiplexing.
By adopting the technical scheme of the embodiment, the high-definition programs in a certain coding format can be re-coded according to another coding format after being decoded, so that compatibility among high-definition programs in different coding formats and compatibility among high-definition equipment in different coding formats are realized.
The application modes of the technical solution of the present embodiment may include, but are not limited to, the following two types:
the first, high definition video H.264/AVS/VC-1 to MPEG-2 transcoding:
inputting digital television signals (namely high-definition programs) through an ASI or IP interface;
and after automatically analyzing the compressed encoding format of the input high-definition program to be H.264/AVS/VC-1, transcoding according to the specified output high-definition encoding format MPEG-2. If the user needs to perform the area mosaic processing, station caption and picture insertion application on the video content, the material to be inserted is firstly subjected to the dot matrix storage in the buffer area and is subjected to the synthesis processing with the decoded high-definition signal, so that the content to be loaded is displayed in the encoded high-definition video content. The output transcoded MPEG-2 based TS stream can be multiplexed with other transcoded TS streams according to the user requirements and output according to interfaces specified by ASI or IP.
If the input TS stream needs to be subjected to code stream detection, the TS stream is extracted from an input interface, a corresponding analysis module is called, errors in the primary level and the secondary level of the TS stream are analyzed, the analysis result is packaged and stored, and the analysis result is read by a main control unit and is displayed and alarmed in a network manager.
Second, high definition video MPEG-2/AVS/VC-1 to H.264 transcoding:
inputting digital television signals (namely high-definition programs) through an ASI or IP interface;
and after automatically analyzing that the compressed coding format of the input high-definition program is MPEG-2/AVS/VC-1, transcoding according to the specified output high-definition coding format H.264. If the user needs to perform the area mosaic processing, station caption and picture insertion application on the video content, the material to be inserted is firstly subjected to the dot matrix storage in the buffer area and is subjected to the synthesis processing with the decoded high-definition signal, so that the content to be loaded is displayed in the encoded high-definition video content. The output transcoded TS based on H.264 can be multiplexed with other transcoded TS according to the needs of users, and output according to interfaces specified by ASI or IP.
If the input TS stream needs to be subjected to code stream detection, the TS stream is extracted from an input interface, a corresponding analysis module is called, errors in the primary level and the secondary level of the TS stream are analyzed, the analysis result is packaged and stored, and the analysis result is read by a main control unit and is displayed and alarmed in a network manager.
Referring to fig. 2, fig. 2 shows a first embodiment of the high definition transcoder based on the HDTV platform of the present invention, which comprises:
an extracting module 201, configured to extract a transport data stream TS from a received digital television signal;
a detection module 202, configured to detect an encoding format of the TS extracted by the extraction module;
the decoding module 203 is configured to decode the TS extracted by the extracting module according to the encoding format detected by the detecting module, so as to obtain a decoded signal;
and the processing module 204 is configured to process the signal decoded by the decoding module according to a specified encoding format.
Further, the extraction module 201 includes:
the demultiplexing submodule 201-1 is used for demultiplexing the received digital television signal to obtain a demultiplexed TS;
and the extraction submodule 201-2 is configured to extract a TS of a desired coding program from the demultiplexed TS obtained by the demultiplexing submodule, as an extracted TS.
Further, the decoding module 203 includes:
the decoding submodule 203-1 is used for decoding the TS extracted by the extraction module according to the coding format detected by the detection module to obtain a high-definition image;
and the image submodule 203-2 is used for carrying out image processing on the high-definition image obtained by the decoding submodule to obtain a decoded signal.
Further, the image sub-module 203-2 includes:
the processing subunit 203-21 is configured to perform mosaic processing on the high-definition image obtained by the decoding submodule; and/or the presence of a gas in the gas,
and the inserting sub-units 203-22 are used for inserting icons and/or pictures into the high-definition images obtained by the decoding sub-modules.
Further, if the demultiplexed TS is directly used as the extracted TS, the processing module 204 may include:
the encoding submodule 204-1 is configured to encode the signal decoded by the decoding module according to a specified encoding format, and output a basic data stream ES;
and the compression submodule 204-2 is used for packing the ES output by the encoding submodule into the TS.
Further, if a part of the demultiplexed TS is taken as an extracted TS, the processing module may include: the encoding submodule is used for encoding the signal decoded by the decoding module according to a specified encoding format and outputting a basic data stream ES; and the compression submodule is used for packaging the ES output by the encoding submodule into the TS. Further on this basis, the processing module may further include:
and the multiplexing submodule is used for multiplexing the TS obtained by packaging the compression submodule and the TS of other programs in the demultiplexed TS obtained by the demultiplexing submodule.
In the above, the detected encoding format includes at least one of H.264, AVS and VC-1, and the specified encoding format is MPEG-2. Alternatively, the detected encoding format includes at least one of MPEG-2, AVS, and VC-1, and the specified encoding format is H.264.
By adopting the technical scheme of the embodiment, the high-definition programs in a certain coding format can be re-coded according to another coding format after being decoded, so that compatibility among high-definition programs in different coding formats and compatibility among high-definition equipment in different coding formats are realized.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating an application of the high definition transcoder based on the digital television HDTV platform of the present invention connected to an external device. The high-definition transcoder based on the digital television HDTV platform can be connected with various input and output devices on the cable television digital broadcasting (DVB), including a video server, a multiplexer, a coder, a scrambler, a modulator (QAM), a set-top box, a multi-picture broadcasting device (AD988) and the like, wherein,
a video server: and the system is used for outputting the high-definition compressed program in a TS mode according to the configuration requirement of an operator.
A multiplexer: for multiplexing and reallocating external high definition compression coding based TSs.
An encoder: the method is used for compressing the high-definition lossless program source into the TS based on high-definition compression coding.
A scrambling machine: for scrambling a TS based on high definition compression coding.
QAM: for TS modulation.
The set-top box: the method is used for supporting a certain coding mode of the high-definition program for decoding.
AD 988: the method is used for supporting a certain coding mode of the high-definition program to carry out decoding multi-picture broadcasting.
Furthermore, the system can be connected with a code stream analyzer for monitoring and alarming TS. When multi-channel high-definition program transcoding is realized, the PC is connected to carry out configuration gating on each channel of high-definition transcoding and control of TS code stream monitoring and alarming.
Referring to fig. 4, fig. 4 shows an 8-channel application of the HDTV-platform based high definition transcoder of the present invention. The high-definition transcoder based on the digital television HDTV platform can be realized by adopting a Field Programmable Gate Array (FPGA) and a Digital Signal Processor (DSP). Wherein,
the main control CPU is used for communicating with the remote user control end and controlling each local processing unit; packing the elementary data stream (ES) into a transport data stream (TS); the TS is carried over an Internet Protocol (IP) network.
The FPGA and the DSP in each path are realized together: transcoding real-time professional high-definition videos from H.264/AVS/VC-1 to MPEG-2, and transcoding from MPEG-2/AVS/VC-1 to H.264; the coding and decoding support: 1920x1080i (code rate support range: 64kbps-62.5 Mbps); TS packaging, TS transmission matrix and Program Specific Information (PSI) insertion; a high speed synchronous serial interface (SPI), a high speed data transfer (DDR2) interface, and a differential signaling (LVDS) interface are provided.
Each path can provide a High Definition Multimedia Interface (HDMI), an IP interface, a Universal Serial Bus (USB) interface, an Asynchronous Serial Interface (ASI), a digital component serial interface (SDI) and a serial communication (RS232) interface to be connected with other external equipment, wherein the HDMI is used for receiving and outputting high definition audio and video signals; an IP interface for providing a gigabit network interface; a USB interface for providing an interface for storing system configuration information; ASI interface: used for TS stream output monitoring; the SDI interface can be applied to an SDI input and output environment; and an RS232 interface which can be used for debugging and configuration of the system.
Referring to fig. 5, fig. 5 shows the working flow of any module in 8 channels of the HDTV platform-based high definition transcoder of the present invention.
The module consists of four FPGAs and one DSP, and each processing part has different division of labor.
The FPGA1 mainly extracts TS stream from input ASI or IP interface signal, detects and alarms TS stream, and when a user selects one of the coded programs to transcode, puts forward the program stream in de-multiplexing and detects the coding format.
The FPGA2 and the DSP decode according to the coding format detected by the program stream, and can perform mosaic processing and insertion of information such as station caption on the decoded high-definition image. The output unencoded high definition signal is input to the FPGA 3.
And the FPGA3 encodes according to a coding format specified by a user.
And the FPGA4 packs the PES and TS streams of the encoded output ES stream and multiplexes the ES stream with other programs for output.
The DSP is adopted for decoding and the FPGA is adopted for encoding, so that parallel high-efficiency video processing can be realized, and the processing capacity is improved.
The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. A high definition transcoding method based on a digital television HDTV platform is characterized by comprising the following steps:
extracting a transport stream TS from the received digital television signal;
detecting an encoding format of the extracted TS;
decoding the extracted TS according to the detected coding format to obtain a decoded signal;
the decoded signal is processed according to a specified encoding format.
2. The method of claim 1, wherein extracting the TS from the received digital television signal comprises:
demultiplexing the received digital television signal to obtain a demultiplexed TS;
and extracting the TS of the required coding program from the demultiplexed TS to be used as the extracted TS.
3. The method of claim 1, wherein the decoding the extracted TS according to the detected encoding format to obtain a decoded signal comprises:
and decoding the extracted TS according to the detected coding format to obtain a high-definition image as a decoded signal.
4. The method of claim 1, wherein the decoding the extracted TS according to the detected encoding format to obtain a decoded signal comprises:
decoding the extracted TS according to the detected coding format to obtain a high-definition image;
and carrying out image processing on the high-definition image to obtain a decoded signal.
5. The method of claim 4, wherein the image processing the high-definition image comprises:
carrying out mosaic processing on the high-definition image; and/or the presence of a gas in the gas,
and inserting icons and/or pictures into the high-definition images.
6. The method of claim 1, wherein said processing the decoded signal according to the specified encoding format comprises:
encoding the decoded signal according to a specified encoding format, and outputting a basic data stream ES;
and packing the ES into TS.
7. The method of claim 2, wherein said processing the decoded signal according to the specified encoding format comprises:
encoding the decoded signal according to a specified encoding format, and outputting a basic data stream ES; and packing the ES into TS.
8. The method of claim 7, wherein processing the decoded signal according to the specified encoding format further comprises:
and multiplexing the TS obtained by packaging with the TS of other programs in the TS after demultiplexing.
9. The method of any of claims 1 to 8, wherein the detected encoding format comprises at least one of h.264, AVS and VC-1, and wherein the specified encoding format is MPEG-2.
10. The method of any of claims 1 to 8, wherein the detected encoding format comprises at least one of MPEG-2, AVS and VC-1, and wherein the specified encoding format is h.264.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306955A (en) * | 2014-07-04 | 2016-02-03 | 上海广播电视台 | 3d video coding system |
| CN106961608A (en) * | 2017-04-07 | 2017-07-18 | 山东师范大学 | High definition decoder digital shows mixed format code stream adaptive processing system and method |
| CN108646998A (en) * | 2018-03-29 | 2018-10-12 | 珠海迈科智能科技股份有限公司 | A kind of LCD front panels of the carrier state monitoring that transcoder is supported and gateway setting function |
| CN111541902A (en) * | 2020-04-30 | 2020-08-14 | 上海鸣啸信息科技股份有限公司 | Distributed multimedia control system equipment applied to station |
-
2008
- 2008-12-22 CN CN 200810187292 patent/CN101521786B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306955A (en) * | 2014-07-04 | 2016-02-03 | 上海广播电视台 | 3d video coding system |
| CN105306955B (en) * | 2014-07-04 | 2019-12-20 | 上海广播电视台 | 3D video coding system |
| CN106961608A (en) * | 2017-04-07 | 2017-07-18 | 山东师范大学 | High definition decoder digital shows mixed format code stream adaptive processing system and method |
| CN106961608B (en) * | 2017-04-07 | 2019-05-28 | 山东师范大学 | High definition decoder digital shows mixed format code stream adaptive processing system and method |
| CN108646998A (en) * | 2018-03-29 | 2018-10-12 | 珠海迈科智能科技股份有限公司 | A kind of LCD front panels of the carrier state monitoring that transcoder is supported and gateway setting function |
| CN111541902A (en) * | 2020-04-30 | 2020-08-14 | 上海鸣啸信息科技股份有限公司 | Distributed multimedia control system equipment applied to station |
| CN111541902B (en) * | 2020-04-30 | 2021-04-13 | 上海鸣啸信息科技股份有限公司 | Distributed multimedia control system equipment applied to station |
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