SYNCHRONIZING THE STORING OF STREAMING VIDEO

• US 20130336627A1
• Filed: 06/06/2013
• Published: 12/19/2013
• Est. Priority Date: 06/18/2012
• Status: Active Grant

• Current Assignee: Axis AB (Canon Inc.)
• Original Assignee: MicroPower Technologies, Inc.
• Inventors: Calvert, Kerry
• Granted Patent: US 8,863,208 B2
• Time in Patent Office: Days
• US Class Current: 386/224
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04N 21/2187 Live feed
• CPC Class Codes: H04N 21/23106 involving caching operations prefetching while addressing of a memory level in which the access to the desired data or data block requires associative addressing means within memory systems or architectures G06F12/0862; caching at an intermediate stage in a data network H04L67/568
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/26216 involving the channel capacity, e.g. network bandwidth admission control, resource allocation in open networks H04L12/5692; flow control in packet networks H04L47/10; establishing a schedule or organising the servicing of application requests taking into account QoS H04L67/61
• CPC Class Codes: H04N 21/64322 IP
• CPC Class Codes: H04N 21/8456 by decomposing the content in the time domain, e.g. in time segments
• CPC Class Codes: H04N 5/76 Television signal recording
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source
• CPC Class Codes: H04N 9/79 Processing of colour television signals in connection with recording

Abstract

A method, system, and computer-readable medium for synchronizing video are described. The system captures video data with a camera, the video data including a first video data segment and a second video data segment. When a network between the camera and a hub is insufficient to allow downstream real-time streaming of the video data, the system stores the first video data segment on a first storage. When the network is sufficient to allow downstream real-time streaming of the video data, the system transfers the second video data segment from the camera to the hub, reads the first video data segment from the first storage, and transfers the first video data segment to the hub. The system stores the video data segments onto a second storage such that a non-real-time playback from the second storage shows the first video data segment and the second video data segment in sequence.

Claims

1. A method for synchronizing video comprising:

capturing video data with a camera, the video data including a first video data segment and a second video data segment;

when a network between the camera and a hub is insufficient to allow downstream real-time streaming of the video data, storing the first video data segment on a first storage;

when the network between the camera and the hub is sufficient to allow downstream real-time streaming of the video data,

transferring the second video data segment from the camera to the hub over the network,

reading the first video data segment from the first storage, and

transferring the first video data segment to the hub over the network; and

storing the first video data segment and the second video data segment onto a second storage such that a non-real-time playback from the second storage shows the first video data segment and the second video data segment in sequence.

2. The method of claim 1, wherein:

the first video data segment is transferred over the network on a first channel,

the second video data segment is transferred over the network on a second channel, and

the second channel is more time-sensitive than the first channel.

3. The method of claim 1, further comprising:

displaying a copy of the second video data segment to a viewer in real time during the transferring of the second video data segment.

4. The method of claim 3, wherein the displaying includes:

transferring the copy of the second video data segment over a display network,

determining a bandwidth of the display network, and

based on the bandwidth of the display network, reducing a full resolution of the second video data segment to make the copy of the second video data segment that is displayed to the viewer.

5. The method of claim 1, wherein the storing onto the second storage includes constructing a hash table that catalogs and relates the video data segments to respective time segments.

6. The method of claim 1, wherein when the network has sufficient bandwidth for real-time streaming of the video data during the second time segment occurring after the first time segment, the hub is configured to send control data to the camera requesting the steps of reading the first video data segment and transferring the first video data segment.

7. The method of claim 1, further comprising:

creating a keyframe index during the storing; and

when a playback position is requested and the playback position does not exist in the second storage, using the keyframe index to find a next decodable video data, the next decodable video data being stored in the second storage.

8. A network camera system for synchronizing video comprising:

a camera configured to

(i) capture video data including a first video data segment and a second video data segment,

(ii) store the first video data segment on a first storage when a network is unable to provide for real-time streaming of the video data, and

(iii) transfer the second video data segment to a hub over the network, read the first video data segment from the first storage, and transfer the first video data segment to the hub over the network, when the network is able to provide for the real-time streaming of the video data; and

a hub configured to store the first video data segment and the second video data segment onto a second storage such that a non-real-time playback from the second storage shows the first video data segment and the second video data segment in sequence.

9. The network camera system of claim 8, wherein:

the first video data segment is transferred over the network on a first channel,

the second video data segment is transferred over the network on a second channel, and

the second channel is more time-sensitive than the first channel.

10. The network camera system of claim 8, wherein

the hub is further configured to display a copy of the second video data segment to a viewer in real time during the transferring of the second video data segment.

11. The network camera system of claim 10, wherein the display includes:

transferring the copy of the second video data segment over a display network,

determining a bandwidth of the display network, and

based on the bandwidth of the display network, reducing a full resolution of the second video data segment to make the copy of the second video data segment that is displayed to the viewer.

12. The network camera system of claim 8, wherein

the hub is further configured to construct a hash table that catalogs and relates the video data segments to respective time segments.

13. The network camera system of claim 8, wherein the hub is further configured to create a keyframe index during the storing;

and

when a playback position is requested and the playback position does not exist in the second storage, using the keyframe index to find a next decodable video data, the next decodable video data being stored in the second storage.

14. A computer-readable medium storing instructions which, when executed by a processor, causes a network camera system to execute a video synchronization method comprising:

capturing video data with a camera, the video data including a first video data segment and a second video data segment;

when a network between the camera and a hub is insufficient to allow downstream real-time streaming of the video data, storing the first video data segment on a first storage;

when the network between the camera and the hub is sufficient to allow downstream real-time streaming of the video data,

transferring the second video data segment from the camera to the hub over the network,

reading the first video data segment from the first storage, and

transferring the first video data segment to the hub over the network; and

storing the first video data segment and the second video data segment onto a second storage such that a non-real-time playback from the second storage shows the first video data segment and the second video data segment in sequence.

15. The computer-readable medium of claim 14, wherein:

the first video data segment is transferred over the network on a first channel,

the second video data segment is transferred over the network on a second channel, and

the second channel is more time-sensitive than the first channel.

16. The computer-readable medium of claim 14, the video synchronization method further comprising:

displaying a copy of the second video data segment to a viewer in real time during the transferring of the second video data segment.

17. The computer-readable medium of claim 16, wherein the displaying includes:

transferring the copy of the second video data segment over a display network,

determining a bandwidth of the display network, and

based on the bandwidth of the display network, reducing a full resolution of the second video data segment to make the copy of the second video data segment that is displayed to the viewer.

18. The computer-readable medium of claim 14, wherein the storing onto the second storage includes constructing a hash table that catalogs and relates the video data segments to respective time segments.

19. The computer-readable medium of claim 14, the video synchronization method further comprising:

creating a keyframe index during the storing; and

when a playback position is requested and the playback position does not exist in the second storage, using the keyframe index to find a next decodable video data, the next decodable video data being stored in the second storage.