JP2020113922A - Video distribution device, video distribution method, and program - Google Patents

Abstract

To reliably buffer necessary video image data even when the number of types of generated video image data increases.SOLUTION: A video distribution device includes generation means for generating a plurality of different types of video image data on the basis of a captured image, storage means for storing the plurality of pieces of video image data generated by the generation means in temporary storage means, transmitting means for transmitting a segment which is a part of the data of one piece of video data in the time axis direction of the plurality of pieces of video data, and deleting means for deleting the segment that has been transmitted from the temporary storage means when the transmitting means has completed transmitting the segment.SELECTED DRAWING: Figure 7

Description

The present invention relates to a moving picture distribution device, a moving picture distribution method, and a program.

In recent years, distribution systems using an IP (Internet Protocol) network have been increasing. Such distribution systems include systems that distribute the status of ski resorts and zoos, and systems that monitor stores and buildings.

In video services, Adaptive Bitrate Streaming technology using HTTP (Hyper Text Transfer Protocol) has become widespread. The Adaptive Bitrate Streaming technology includes DASH (Dynamic Adaptive Streaming over HTTP) and HLS (HTTP Live Streaming). DASH is a technology standardized by MPEG (Moving Picture Experts Group). HLS is a technology standardized by Apple.

In general DASH distribution, a plurality of moving image data having different resolutions and bit rates are divided on the distribution server side into moving image files called segments of several seconds. On the other hand, the client acquires an MPD (Media Presentation Description) file in which the entire information of the moving image is described from the distribution server, refers to the file, and selects a moving image stream having an appropriate resolution and bit rate. Then, the client downloads and reproduces the moving image data of the MPEG2 TS stream or MP4 file in segment units according to the description of MPD.

In Patent Document 1, a plurality of moving image streams are time-divided, and traffic information including the data size and reproduction time of each stream and a grace time until the start of distribution are taken into consideration to determine transmission scheduling. A method is disclosed.

JP, 2007-318470, A

However, in the moving image distribution service using the Adaptive Bitrate Streaming technology, it is necessary to generate a plurality of moving image data and buffer the moving image data until the client application obtains necessary data. Therefore, when the number of types of moving image data to be generated increases, there is a problem that the required moving image data cannot be buffered due to an increase in memory usage.

The present invention has been made in view of such problems, and an object thereof is to reliably buffer necessary moving image data even when the types of moving image data to be generated increase.

Therefore, the present invention is a moving image distribution apparatus, wherein a generation unit that generates a plurality of different types of moving image data based on a captured image, and the plurality of moving image data generated by the generation unit are temporarily stored in a storage unit. Storing means for storing, transmitting means for transmitting a segment obtained by segmenting one of the plurality of moving image data along the time axis, and transmitting when the transmitting means completes transmission of the segment And deleting means for deleting the completed segment from the temporary storage means.

According to the present invention, it is possible to reliably buffer necessary moving image data even when the number of types of generated moving image data increases.

1 is an overall configuration diagram of a moving image distribution system. It is a hardware block diagram of a camera server apparatus. It is a functional block diagram of a camera server apparatus. It is a block diagram of distribution data. FIG. 3 is a relationship diagram between moving image streams 1 to 3 and segments. It is a sequence diagram which shows a moving image delivery process. It is a flow chart which shows distribution management processing. It is a flowchart which shows the delivery management process which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an overall configuration diagram of a moving image distribution system according to the present embodiment. The moving image distribution system has a camera server device 100 and a client device 120. The camera server device 100 and the client device 120 are connected to each other via a network 140. The camera server device 100 includes a camera, and delivers a captured image (moving image) obtained by the camera via the network 140. The camera server device 100 according to the present embodiment generates a plurality of moving images of different types by DASH distribution, and transmits to the client device 120 a moving image of a type that corresponds to the display performance of the client device 120 and the communication band. Here, as the plurality of different types of moving images, there are a plurality of moving images having different resolutions and bit rates. A segment is a file of moving image data divided (segmented) in a predetermined division unit. That is, the segment is a moving image file including some data in the time axis direction of the moving image. The client device 120 displays the moving image received from the camera server device 100.

Although only one camera server device 100 is shown in FIG. 1 for simplification of description, the moving image distribution system may include a plurality of camera server devices 100. That is, a plurality of camera server devices 100 may deliver a moving image to one client device 120. Further, as another example, one camera server device 100 may deliver a moving image to a plurality of client devices 120.

The network 140 is composed of a plurality of routers, switches, cables, etc. that satisfy communication standards such as Ethernet (registered trademark). The network 140 may have any communication standard, scale, and configuration as long as communication between devices can be performed without any trouble. Therefore, it can be applied from the Internet to a LAN (Local Area Network).

FIG. 2 is a hardware configuration diagram of the camera server device 100. The camera server device 100 includes a CPU 201, a primary storage device 202, a secondary storage device 203, an image capture I/F 204, an image sensor 205, and a network I/F 206. The CPU 201, the primary storage device 202, the secondary storage device 203, the image capture I/F 204, and the network I/F 206 are connected to each other via an internal bus 207.

The CPU 201 controls the entire camera server device 100. The primary storage device 202 is a writable high-speed storage device represented by a RAM, and is loaded with an OS and various programs and various data, and is also used as a work area of the OS and various programs. The secondary storage device 203 is a non-volatile storage device represented by a flash memory, an HDD, an SD card, etc., and is used as a permanent storage area for the OS, various programs, and various data, as well as various short-term data. It is also used as a storage area.

An image sensor 205 composed of CCD or CMOS is connected to the image capture I/F 204. The image capture I/F 204 converts/compresses the image data acquired from the image sensor 205 into a predetermined format, and transfers the converted/compressed image data to the primary storage device 202. The network I/F 206 is an I/F for connecting to the above-described network 140, and is responsible for communication with the client device 120 and the like via a communication medium such as Ethernet.

FIG. 3 is a functional configuration diagram of the camera server device 100. The camera server device 100 includes an imaging processing unit 301, a distribution management unit 302, and a communication processing unit 303. Note that these functions are realized by the CPU 201 executing various programs including the OS. The imaging processing unit 301 acquires the moving image frame generated by the image sensor 205 via the image capture I/F 204. Then, the imaging processing unit 301 performs an encoding process on the acquired moving image frame. Further, the imaging processing unit 301 stores the encoded moving image frame in the primary storage device 202 together with moving image meta information necessary for moving image playback such as SPS (Sequence Parameter Set) and PPS (Picture Parameter Set).

The distribution management unit 302 controls the process of distributing the moving image frame stored in the primary storage device 202 to the client device 120 by DASH distribution. The distribution management unit 302 generates a plurality of moving image frames of different types from the moving image frames stored in the primary storage device 202. Specifically, the distribution management unit 302 generates a plurality of moving image frames with different resolutions. Further, the distribution management unit 302 creates initialization segment information and segment information based on the moving picture meta information and the moving picture frame stored in the primary storage device 202. Here, the initialization segment information is information necessary for reproducing the moving image stream. The segment information is information necessary for reproducing each segment included in the moving image frame. The segment information includes a single or a plurality of moving image frames included in the segment and a header portion of the segment. The communication processing unit 303 controls communication with an external device. The communication processing unit 303 transmits the segment information to the client device 120 under the control of the distribution management unit 302, for example.

FIG. 4 is a configuration diagram of distribution data used for DASH distribution. An MPD file 400 that bundles moving image information exists at the highest level of the distribution data. In the MPD file 400, resolution, coding information, and segment information are defined as moving image stream information. The video stream may be single or plural. In the present embodiment, it is assumed that the MPD file 400 defines three moving image streams with different resolutions (moving image stream 1, moving image stream 2, and moving image stream 3).

The moving image stream 1 is a moving image file having the highest resolution. When the moving picture stream 1 is distributed, the amount of data downloaded by the client device 120 is large, but it is possible to reproduce a high quality moving picture. The moving image stream 3 is a moving image file having the smallest resolution. The moving picture stream 2 is a moving picture file having a medium resolution. The moving image stream 2 has a smaller data amount than the moving image stream 1 and has a larger data amount than the moving image stream 3.

FIG. 5 is a relationship diagram between the moving image streams 1 to 3 and the segments. Here, for ease of understanding, the moving image frames generated per second are 3 frames, and the 3 frames are 1 segment. The imaging processing unit 301 generates continuous moving image frames 500 to 508 as the moving image stream 1. Of these, the moving image frames 500, 503, and 506 are I frames. Other moving image frames 501, 502, 504, 505, 507, 508 are P frames. Here, the I frame is a frame having image information necessary to form a complete image. The P frame is a frame having video information of a difference from the immediately preceding image. Similarly, the imaging processing unit 301 generates moving image frames 510 to 518 as the moving image stream 2 and generates moving image frames 520 to 528 as the moving image stream 3.

Each segment contains three video frames. That is, the first segment (segment 1) of the moving image stream 1 includes moving image frames 500 to 502, the following segment 2 includes moving image frames 503 to 505, and the following segment 3 includes moving image frames 506 to. 508 is included. Similarly, the segment 1 of the video stream 2 includes video frames 510 to 512, the segment 2 includes video frames 513 to 515, and the segment 3 includes video frames 516 to 518. .. The same applies to the moving image stream 3. In the present embodiment, the moving image information of the difference is the P frame, but it may be the B frame.

FIG. 6 is a sequence diagram showing the moving image distribution process. The moving image distribution process is a process in which the camera server device 100 distributes a moving image to the client device 120. In step S<b>601, the client device 120 sends an acquisition request for the MPD file 400 to the camera server device 100. Upon receiving the acquisition request for the MPD file 400, the camera server device 100 advances the process to S602. In step S<b>602, the distribution management unit 302 creates the MPD file 400 and sends the MPD file 400 to the client device 120 via the communication processing unit 303.

Upon receiving the MPD file 400, the client device 120 advances the process to S603. In step S603, the client device 120 refers to the MPD file 400 and selects a moving image stream to be received based on its own CPU capability, display resolution, communication state, and the like. In the present embodiment, the client device 120 automatically selects a moving image stream, that is, a type of moving image according to the communication state. Note that, as another example, the client device 120 may select a video stream according to a selection instruction input according to a user operation. The client device 120 transmits to the camera server device 100 a request for acquiring initialization segment information that specifies the selected type of moving image stream. Here, the initialization segment information is information necessary for reproducing the selected moving picture stream. It should be noted that in the present embodiment, the following processing will be described by taking as an example the case where the video stream 1 is selected from the three video streams shown in FIG. 4 by the client device 120.

Upon receiving the acquisition request for the MPD file 400 in S601, the distribution management unit 302 of the camera server apparatus 100 requests the imaging processing unit 301 to start generation of a moving image stream in order to transmit the initialization segment in S610. The processing order of the processing of S602 and the processing of S610 does not matter.

When the imaging processing unit 301 receives a request to start generating a moving image stream, the processing proceeds to step S611. In step S611, the imaging processing unit 301 generates SPS/PPS and an I frame that is the first moving image frame. Note that the imaging processing unit 301 generates, as I frames, three frames having different resolutions corresponding to the three moving image streams (moving image stream 1, moving image stream 2, and moving image stream 3). In the example of FIG. 5, moving image frames 500, 510 and 520 are generated. The imaging processing unit 301 stores the generated I frame in the primary storage device 202.

Thereafter, in S612 and S613, the imaging processing unit 301 sequentially generates three moving image frames corresponding to the three moving image streams, and stores these in the primary storage device 202. The imaging processing unit 301 notifies the distribution management unit 302 of completion of generation each time a moving image frame is generated. It should be noted that the processing of moving image frame generation by the imaging processing unit 301 (S611 to S613, etc.) is executed independently of the processing of the distribution management unit 302.

On the other hand, when the distribution management unit 302 receives the initialization segment information acquisition request in S603, the process proceeds to S604. In step S604, the camera server device 100 transmits the moving image meta information including SPS/PPS to the client device 120 as the initialization segment information.

Further, when the generation of the segment corresponding to each of the plurality of moving image streams is completed, the distribution management unit 302 advances the process to S614. In the present embodiment, when the processing of S613 is completed, the distribution management unit 302 advances the processing to S614. In S614, the distribution management unit 302 combines the moving image frames 1 to 3 to generate the segment 1. As a result, the distribution management unit 302 generates three segments 1 corresponding to the moving image streams 1 to 3, respectively.

On the other hand, when the client device 120 receives the initialization segment in S604, the process proceeds to S605. In step S605, the client apparatus 120 transmits to the camera server apparatus 100 a request to acquire the segment information of the first segment (segment 1) of the moving image stream 1. When the distribution management unit 302 of the camera server device 100 receives the segment information acquisition request for the segment 1 in S605, the process proceeds to S606. In step S606, the distribution management unit 302 determines the segment related to the acquisition request as the transmission target segment, and transmits the segment information of the determined segment to the client device 120. Here, the segment of the moving image stream related to the acquisition request is referred to as a target segment. In this example, the distribution management unit 302 transmits the segment information of the segment 1 of the stream 1 as the segment information of the target segment. Upon receiving the segment information of segment 1 of stream 1 in S606, the client apparatus 120 advances the process to S609. In step S609, the client device 120 plays back a moving image. If necessary, the client device 120 may buffer the video for a predetermined time and then start playing the video.

After the processing of S606, the distribution management unit 302 deletes (releases) the corresponding segment from the primary storage device 202 as a temporary storage unit in S615. Here, the corresponding segment is a segment of a type different from the target segment relating to the acquisition request, and is a segment of a timing corresponding to the target segment. In the present embodiment, the corresponding stream is a segment having the same timing as the segment related to the acquisition request. When the segment 1 of the stream 1 is the target segment, the segment 1 of the undelivered streams 2 and 3, which is the segment having the same timing as the segment 1 of the stream 1, becomes the corresponding segment. The delivery management unit 302 deletes the corresponding segment (segment 1 of streams 2 and 3). In the present embodiment, the distribution management unit 302 deletes the corresponding segment at the timing when the acquisition request for the target segment is received. As another example, the distribution management unit 302 may delete the corresponding segment after receiving the acquisition request for the target segment, and the timing is not limited to the embodiment.

Note that the processing of S606 and the processing of S615 are processing performed independently after S605, and the order of both processings is not limited to the embodiment. That is, the processing of S606 and the processing of S615 may be performed at the same time.

Further, when the transmission of the segment 1 of the stream 1 is completed, the distribution management unit 302 advances the process to S616. In step S616, the distribution management unit 302 deletes (releases) segment 1 of stream 1 that has been distributed from the primary storage device 202. In this way, the delivery management unit 302 deletes the target segment at the timing when the transmission of the target segment is completed. Note that, as another example, the distribution management unit 302 may delete the target segment after the transmission of the target segment is completed, and the timing is not limited to the embodiment.

After that, the distribution management unit 302 repeats the process of transmitting the moving image frame to the client device 120 on a segment basis each time an acquisition request is received from the client device 120. As a result, video distribution continues. Furthermore, during video distribution, the communication state between the camera server apparatus 100 and the client apparatus 120 may change, and the client apparatus 120 may send a segment acquisition request specifying video streams of different types (resolutions). For example, when the communication speed decreases, the client device 120 requests a lower resolution moving image. In the following, with reference to S621 and subsequent steps in FIG. 6, description will be given of processing in the case where an acquisition request for the segment 2 of the moving image stream 3 is transmitted after the processing in S606.

In step S<b>621, the client apparatus 120 transmits a segment information acquisition request for the segment 2 of the moving image stream 3 to the camera server apparatus 100. When the distribution management unit 302 receives the acquisition request for the segment information of the segment 2 in S621, the distribution management unit 302 advances the process to S622. In S622, the distribution management unit 302 transmits the segment information of the segment 2 of the moving image stream (moving image stream 3) related to the acquisition request via the communication processing unit 303. Further, in S623, the distribution management unit 302 deletes the segment 2 of the video stream other than the video stream related to the acquisition request from the primary storage device 202. In this example, the segment 2 of each of the moving image streams 1 and 2 is deleted. Further, when the transmission of the segment 2 of the moving image stream 3 is completed, the distribution management unit 302 advances the process to S624. In step S<b>624, the delivery management unit 302 deletes (releases) the segment 2 of the delivered moving image stream 3 from the primary storage device 202.

FIG. 7 is a flowchart showing the distribution management process by the distribution management unit 302. The distribution management process is started when the camera server device 100 receives an acquisition request for the MPD file 400 from the client device 120. In step S<b>701, the distribution management unit 302 requests the imaging processing unit 301 to start generating a moving image stream. This process corresponds to the process of S610 described with reference to FIG. Next, in step S<b>702, the distribution management unit 302 transmits the MPD file to the client device 120 via the communication processing unit 303. This process corresponds to the process of S602. The processing order of the processing of S701 and the processing of S702 is not particularly limited.

Next, in S703, the delivery management unit 302 waits until an event occurs. Next, in S704, the distribution management unit 302 confirms the content of the event when the event occurs. When the content of the event is the completion of the moving image frame generation from the imaging processing unit 301 (frame generation completion in S704), the distribution management unit 302 advances the process to S705. If the content of the event is a segment acquisition request from the client device 120 (segment acquisition request in S704), the distribution management unit 302 advances the process to S709.

In step S705, the distribution management unit 302 determines whether all moving image frames included in one segment have been generated. In the present embodiment, the delivery management unit 302 determines whether or not three moving image frames have been generated. If the moving image frames for the segments have been generated (YES in S705), the distribution management unit 302 advances the process to S706. When the moving image frames for the segments have not been generated (NO in S705), the distribution management unit 302 advances the process to S708.

In step S706, the delivery management unit 302 creates a segment. Specifically, the distribution management unit 302 generates a segment including the generated moving image frame, and stores the segment number for identifying the generated segment and the information of the moving image frame included in the segment in the primary storage device 202. Next, in S707, the delivery management unit 302 adds the segment number of the generated segment to the transmission waiting list, and then advances the process to S703. Further, in S708, the distribution management unit 302 stores the information of the newly generated moving image frame in the primary storage device 202, and then advances the processing to S703.

In S709, the distribution management unit 302 determines whether the segment related to the acquisition request has already been generated. When the segment related to the acquisition request has been generated (YES in S709), the distribution management unit 302 advances the process to S710. When the target segment that is the segment relating to the acquisition request has not been generated (NO in S709), the distribution management unit 302 advances the process to S714.

In step S710, the distribution management unit 302 starts transmission of the target segment related to the acquisition request to the client device 120. Next, in S711, the distribution management unit 302 deletes the corresponding segment corresponding to the target segment from the primary storage device 202. The processing of S710 corresponds to the processing of S606 and S622. Further, the processing of S711 corresponds to the processing of S615 and S623. Here, the process of S711 is an example of a deletion process of deleting the corresponding segment corresponding to the target segment from the temporary storage device at the timing of receiving the acquisition request when the acquisition request of the target segment is received. The processing order of the processing of S710 and the processing of S711 is not limited to the embodiment.

Subsequently, in S712, the delivery management unit 302 confirms whether or not the transmission of the target segment is completed. The delivery management unit 302 waits until the transmission is completed, and if the transmission is completed (YES in S712), the process proceeds to S713. In S713, the delivery management unit 302 deletes the target segment from the primary storage device 202, and then advances the process to S703. The processing of S713 corresponds to the processing of S616 and S624 of FIG. As described above, the timing of deleting the target segment does not have to be immediately after the process of S710. For example, the distribution management unit 302 may perform the process of S710 after the process of S713. That is, the distribution management unit 302 may delete the corresponding segment after deleting the target segment. As another example, the distribution management unit 302 may delete the target segment and the corresponding segment at the same time. Note that in S714, the delivery management unit 302 transmits an error response to the client device 120, and then advances the process to S703. Note that in S714, the delivery management unit 302 may wait for a segment to be generated instead of transmitting an error response. The other configurations and processes of the moving image distribution system according to the second embodiment are similar to those of the moving image distribution system according to the first embodiment.

As described above, the camera server device 100 of the present embodiment deletes the corresponding segment of the timing corresponding to the target segment from the primary storage device 202 at the timing of receiving the segment acquisition request. Furthermore, when the transmission of the target segment is completed, the camera server device 100 also deletes the target segment from the primary storage device 202. Therefore, the amount of memory used can be reduced, so that even if the number of types of moving image data generated increases, the necessary moving image data can be reliably buffered.

A first modification of the first embodiment will be described. In the present embodiment, the moving image distribution process has been described by taking the case of using DASH distribution as an example, but the distribution method is not limited to the embodiment. As another example, other Adaptive Bitrate Streaming technology such as HLS distribution may be used for moving image distribution.

As a second modified example, the timing of deleting the corresponding segment corresponding to the target segment to be transmitted is not limited to the embodiment. As another example, the delivery management unit 302 deletes the corresponding segment corresponding to the target segment related to the acquisition request on condition that the transmission of the target segment is started instead of receiving the acquisition request for the segment. May be.

(Second embodiment)
Next, the moving image distribution system according to the second embodiment will be described mainly with respect to differences from the moving image distribution system according to the first embodiment. In the second embodiment, in the camera server device 100, the maximum buffering time until the segment is released is set in advance. The maximum buffering time shall be described in the MPD file 400.

FIG. 8 is a flowchart showing distribution management processing by the distribution management unit 302 according to the second embodiment. It should be noted that, of the respective processes of the delivery management process shown in FIG. 8, the same processes as the delivery management process according to the first embodiment described with reference to FIG. 7 are given the same numbers. The distribution management unit 302 advances the process to S801 after the process of S710. In S801, the delivery management unit 302 confirms whether or not the transmission of the target segment is completed. When the transmission of the target segment is completed (YES in S801), the delivery management unit 302 advances the process to S802. When the transmission of the target segment is not completed (NO in S801), the delivery management unit 302 advances the process to S804.

In step S<b>802, the delivery management unit 302 deletes the corresponding segment corresponding to the target segment from the primary storage device 202. In this way, the delivery management unit 302 according to the present embodiment deletes the corresponding segment when the transmission of the target segment is completed. Next, in S803, the distribution management unit 302 deletes the corresponding segment from the primary storage device 202, and then advances the process to S703. Note that the processing order of the processing of S802 and the processing of S803 is not limited to the embodiment. As another example, the distribution management unit 302 may perform the process of S803 first, or may perform the process of S802 and the process of S803 at the same time.

On the other hand, in S804, the delivery management unit 302 confirms whether the elapsed time from the time when the corresponding segment is generated exceeds the maximum buffering time. When the elapsed time exceeds the maximum buffering time (YES in S804), the delivery management unit 302 advances the process to S805. When the elapsed time does not exceed the maximum buffering time (NO in S804), the delivery management unit 302 advances the process to S801. For example, it may take time to transmit the corresponding segment due to deterioration of the communication state. In such a case, the maximum buffering time may elapse before the transmission of the corresponding segment is completed. The maximum buffering time is an example of the predetermined time.

In step S805, the delivery management unit 302 deletes the corresponding segment from the primary storage device 202. Next, in S806, the delivery management unit 302 confirms again whether or not the transmission of the target segment is completed. The delivery management unit 302 waits until the transmission of the target segment is completed, and when the transmission is completed (YES in S806), advances the process to S807. In step S807, the distribution management unit 302 deletes the target segment from the primary storage device 202.

As described above, the camera server device 100 according to the second embodiment deletes the corresponding segment from the primary storage device 202 when the transmission of the target segment is completed. That is, the primary storage device 202 holds the corresponding segment until the transmission of the target segment is completed. Therefore, when the transmission of the target segment fails, the delivery management unit 302 can transmit the corresponding segment corresponding to the target segment. Further, the camera server device 100 deletes the corresponding segment from the primary storage device 202 even when the maximum buffering time has elapsed while the transmission of the target segment is not completed. As a result, even if the transmission of the target segment takes time, the memory can be released without waiting for the completion of the transmission of the target segment.

As a first modified example of the second embodiment, the delivery management unit 302 may delete the corresponding segment on condition that a predetermined time has elapsed from the start of transmission of the target segment related to the acquisition request.

Further, as a second modification, the distribution management unit 302 may delete the corresponding segment on condition that the maximum buffering time has elapsed, regardless of whether or not the transmission of the target segment is completed. .. That is, the delivery management unit 302 may delete the corresponding segment even if the transmission of the target segment is completed before the maximum buffering time has elapsed, on the condition that the maximum buffering time has elapsed.

(Third Embodiment)
Next, the moving image distribution system according to the third embodiment will be described mainly regarding differences from the moving image distribution system according to the other embodiments. In the third embodiment, the camera server device 100 is assumed to perform video distribution to a plurality of client devices 120.

It is assumed that the camera server device 100 has received the acquisition requests of the same type and the same timing segment from the plurality of client devices 120. In this case, the camera server device 100 transmits the target segment related to the request to all the client devices 120 that are the transmission sources of the acquisition request. Then, the camera server device 100 deletes the target segment from the primary storage device 202 when the transmission of the target segment to all the client devices 120 is completed.

Furthermore, in the camera server device 100, the client device 120 of the transmission destination is assumed to be registered in advance. Furthermore, it is assumed that the camera server device 100 receives a segment acquisition request at a certain timing from all the registered client devices 120. In this case, the camera server device 100 deletes the segment (corresponding segment) not requested by any of the client devices 120 from the primary storage device 202. The other configurations and processes of the moving image distribution system according to the third embodiment are similar to those of the moving image distribution system according to the other embodiments.

Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. -Can be changed.

The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. It can also be realized by the processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

100 camera server device 120 client device 301 imaging processing unit 302 delivery management unit 303 communication management unit

Claims (14)

Generating means for generating a plurality of different types of moving image data based on the captured image;
Storage means for storing in the temporary storage means the plurality of moving image data generated by the generation means,
Transmitting means for transmitting a segment which is a part of data of one moving image data in the time axis direction of the plurality of moving image data,
A moving image distribution apparatus comprising: a deletion unit that deletes the segment, which has been transmitted, from the temporary storage unit, when the transmission unit has completed transmission of the segment. The moving image distribution apparatus according to claim 1, wherein the deletion unit deletes the segment at the timing when the transmission of the segment is completed. A segment of one video data of the plurality of video data is further determined as a target segment of the transmission target,
The transmitting means transmits the target segment,
When the target segment is determined by the determining unit, the deleting unit deletes, from the temporary storage unit, a corresponding segment that is a segment of a type different from the target segment at a timing corresponding to the target segment. The moving image distribution apparatus according to claim 1, wherein the moving image distribution apparatus is a moving image distribution apparatus. The moving image distribution apparatus according to claim 3, wherein the deleting unit deletes the corresponding segment at a timing when the acquisition request for the target segment is received. The moving image distribution apparatus according to claim 3, wherein the deleting unit deletes the corresponding segment at a timing when the transmission of the target segment is started. The moving image distribution apparatus according to claim 3, wherein the deletion unit deletes the corresponding segment at a timing when a predetermined time has elapsed after the transmission of the target segment has started. The moving image distribution apparatus according to claim 3, wherein the deleting unit deletes the corresponding segment at a timing when the transmission of the target segment is completed. The deletion means deletes the corresponding segment at the timing when the transmission of the target segment is completed, when the transmission of the target segment is completed before a predetermined time elapses after the transmission of the target segment is started. The moving image according to claim 3, wherein, when a predetermined time has elapsed while the transmission of the target segment is not completed, the corresponding segment is deleted at a timing when the predetermined time has elapsed. Delivery device. When the first segment is transmitted to each of the plurality of client devices, the deleting unit is configured to transmit the first segment to all of the plurality of client devices at a timing when the transmission of the first segment is completed. 3. The moving image distribution apparatus according to claim 2, wherein the segment is deleted. The deleting unit is a segment of a different timing for a plurality of client devices, and when a segment of corresponding timing is determined as a target segment, a segment of timing corresponding to the target segment, and which client device 4. The moving image distribution apparatus according to claim 3, wherein the segment that is not a transmission target to is deleted from the temporary storage unit. The moving image distribution apparatus according to any one of claims 1 to 10, wherein the generating unit generates a plurality of moving image data having different resolutions. Generating means for generating a plurality of different types of moving image data based on the captured image;
Storage means for storing in the temporary storage means the plurality of moving image data generated by the generation means,
A determining unit that determines one segment obtained by segmenting one moving image data along the time axis among the plurality of moving image data as a target segment to be transmitted,
Transmitting means for transmitting the target segment,
When the target segment is determined by the determining unit, a deleting unit that deletes from the temporary storage unit a corresponding segment that is a segment of a type different from the target segment at a timing corresponding to the target segment A video distribution device characterized by the above. A video distribution method executed by a video distribution device,
A generation step of generating a plurality of different types of moving image data based on the captured image,
A storage step of storing in the temporary storage means the plurality of moving image data generated in the generation step;
A transmitting step of transmitting a segment which is a part of data in the time axis direction of one moving image data of the plurality of moving image data;
And a deletion step of deleting, when the transmission of the segment is completed, the segment, the transmission of which is completed, from the temporary storage means. A program for causing a computer to function as each unit of the moving image distribution apparatus according to claim 1.