H.264 video sub-packaging method of dispatching desk of wideband multimedia trunking system

A trunking system and multimedia technology, which is applied in the field of H.264 video subcontracting, can solve problems such as video quality degradation, and achieve the effect of ensuring video transmission quality

Inactive Publication Date: 2013-09-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing dispatching station cuts the H.264 data into fixed-sized data slices bluntly, resulting in a decrease in video quality, and provides a method for subcontracting H.264 video at the dispatching station of a broadband multimedia trunking system

Method used

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  • H.264 video sub-packaging method of dispatching desk of wideband multimedia trunking system
  • H.264 video sub-packaging method of dispatching desk of wideband multimedia trunking system
  • H.264 video sub-packaging method of dispatching desk of wideband multimedia trunking system

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specific Embodiment approach 1

[0032] Specific implementation mode one: combine figure 1 , Figure 4 and Figure 5 Describe this embodiment, the broadband multimedia trunking system dispatcher H.264 video subcontracting method described in this embodiment is realized through the following steps:

[0033] Step 1, remove the start code of H.264NALU; perform step 2;

[0034] Step 2, judge whether the length of the NALU that removes the start code is less than the MTU, if the judgment result is yes, execute step 3; otherwise, execute step 4;

[0035] Step 3, using a single NAL unit packet subcontracting method for subcontracting; perform step 5;

[0036] Step 4, use the FU-A fragmented packet subcontracting method to subcontract; perform step 5;

[0037] Step 5. Send via Socket;

[0038] The MTU value described in step 2 above is 1024 bytes.

[0039] Since the H.264 NAL units transmitted in the dispatching station of the broadband multimedia trunking system contain a large amount of data, the form of aggr...

specific Embodiment approach 2

[0047] Specific implementation mode two: combination figure 2 Describe this embodiment, the difference between this embodiment and the H.264 video packetization method of the broadband multimedia trunking system dispatching station described in Embodiment 1 is: the single NAL unit packet packetization method in the step 3 of the method is through the following steps accomplish:

[0048] Step 31, add a 12-byte RTP header to each packet to complete the RTP packet; perform step 32;

[0049] Step three and two, add an 8-byte UDP header to each packet; execute step three and three;

[0050] Step 33: Add a 20-byte IP header to each packet.

specific Embodiment approach 3

[0051] Specific implementation mode three: combination image 3 and Figure 6 Describe this embodiment, the difference between this embodiment and the H.264 video packetization method of the broadband multimedia trunking system dispatching station described in Embodiment 1 is: the FU-A fragmentation packet packetization method in the step 4 of the method is passed The following steps are implemented:

[0052] Step 41, divide into several packets whose data length is less than MTU according to the MTU value; execute step 42;

[0053] Step 42, remove the NALU header of 1 byte of the original data; perform step 43;

[0054] Step 43: Add 1-byte FU indication to each small packet; execute step 44;

[0055] Step 44: Add 1-byte FU header to each packet; perform steps 4 and 5;

[0056] Step 4 and 5, add a 12-byte RTP header to each packet to complete the RTP packet; perform steps 4 and 6;

[0057] Step 46, add an 8-byte UDP header to each packet; execute step 47;

[0058] Step 47:...

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Abstract

The invention discloses an H.264 video sub-packaging method of a dispatching desk of a wideband multimedia trunking system, and relates to H.264 video packaging technology, and solves the problem that the video quality is decreased because existing dispatching desk rigidly cuts H.264 data into data pieces with fixed sizes. The method comprises the following steps of setting an MTU (Maximum Transmission Unit) value as 1024 bytes; removing the start code of an H.264NALU (Network Abstract Layer Unit) unit; when NALU without the start code is shorter than MTU, sub-packaging by a single NAL (Network Abstract Layer) unit sub-packaging method; and when NALU without the start code is longer than MTU, sub-packaging by an FU-A (Field Unit-A) sub-piece sub-packaging method. The advantages of the RTP (Real Time Protocol) are exerted, and the video quality can be ensured. The method provided by the invention is suitable for the technical field of H.264 video transmission by the dispatching desk in the wideband multimedia trunking system.

Description

technical field [0001] The invention relates to the H.264 video transmission technology of a dispatching station in a broadband multimedia trunking system, in particular to the H.264 video packetization technology. Background technique [0002] The broadband multimedia trunking system is a broadband wireless multimedia access system for key industry applications. It is a communication system established for the special service needs of government departments, government agencies, industry users, and enterprises. Important functions such as transmission. Broadband multimedia trunking system is the R&D and industrialization of broadband multimedia wireless access system for key industries such as public security system. It can strengthen the country's ability to respond to public security, emergency handling, large-scale gatherings, rescue of natural disasters, defense against hostile forces, prevention of terrorist attacks, and emergency response to many emergencies. It can ...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N21/6437
Inventor 韩帅王柏岩莫云马琳孟维晓
Owner HARBIN INST OF TECH
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