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Video pre-recording method and device

A pre-recording and video technology, which is applied in the field of video processing, can solve the problems of short pre-recording time and limited video pre-recording memory capacity, and achieve the effect of improving the write throughput rate

Active Publication Date: 2018-05-29
SHENZHEN HUABAO ELECTRONICS TECH
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method and device for video pre-recording to solve the problem that the existing video pre-recording is limited by the memory capacity and the pre-recording time is short

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  • Video pre-recording method and device

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The embodiment of the present invention uses an external storage device as a pre-recording buffer, so that the pre-recording time is not limited by the memory capacity, thereby being able to support a long pre-recording time; the pre-recording frame is written into the memory in advance, and N pre-recording frames are composed A pre-recorded image group, M pre-recorded image groups are formed into a pre-recorded data block, and then the pre-recorded data block in the internal memory is written out to the external storage device, thereby writing the pre-recorded frames into the external storag...

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Abstract

The invention is applicable to the technical field of video processing, and provides a video prerecording method and device. The method includes the steps: acquiring prerecording time and prerecording frame rate, and determining the number F of prerecording frames according to the acquired prerecording time and the acquired prerecording frame rate; writing the prerecording frames into a memory, forming a prerecording image group by N prerecording frames, forming a prerecording data block by M prerecording image groups; writing the prerecording data block in the memory to an external storage device after any prerecording data block in the memory is formed if the determined number F of the prerecording frames is larger than a preset value. A first frame of the prerecording image group is a key frame. The external storage device is used as a prerecording cache, and the prerecording time is not limited by the capacity of the memory, so that long prerecording time can be supported. The prerecording frames in the memory are written into the external storage device according to blocks, so that the writing throughput rate of the external storage device is increased.

Description

technical field [0001] The invention belongs to the technical field of video processing, and in particular relates to a video pre-recording method and device. Background technique [0002] In a digital video recorder application, it is a very important function to trigger a recording when an event occurs and provide a pre-recorded video of the first N seconds before the event occurs. Wherein, N is greater than 0. However, different users have different requirements for pre-recording time. [0003] In the prior art, memory is generally selected as the pre-recording cache. Suppose there are 4 channels, the code rate of each channel is 2Mbps, and the maximum pre-recording time is 30 seconds, then the minimum memory capacity is 2Mbps×30s×4=30MB. Due to the limitation of memory capacity, the pre-recording time of the existing video pre-recording method is short. Contents of the invention [0004] In view of this, an embodiment of the present invention provides a method and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/432H04N21/433
CPCH04N21/4331H04N21/4335
Inventor 庄少华陈文明江常杯
Owner SHENZHEN HUABAO ELECTRONICS TECH
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