Video output apparatus and control method therefor, and non-transitory recording (storing) medium that records program
This video output apparatus includes a plurality of input units that input a plurality of video signals and an auxiliary information related to video shot-changes that are associated with the video signals. A composing unit stores the image data associated with the plurality of input video signals in an image memory and reads out image data at a predetermined timing, and outputs a composed video signal. A control unit obtains auxiliary information for each video signal and selects one video signal from among the plurality of video signals by comparing priority orders corresponding to the auxiliary information. The control unit carries out control in which the frame frequency of the video signal that the composition unit outputs by reading out the image data from the image memory is synchronized with the frame frequency of the selected video signal.
1. A video output apparatus that can carry out a composing processing of a plurality of video signals and output the composed video signal, the apparatus comprising:
a plurality of input units that input the plurality of video signals and an auxiliary information for the video signals;
a composition unit that stores the plurality of video signals that have been input to the plurality of input units in a storage unit, reads out the plurality of video signals from the storage unit, and composes the plurality of video signals; and
a control unit that selects one video signal from among the plurality of video signals by comparing a priority orders corresponding to the auxiliary information of the plurality of video signals that have been input to the plurality of input units, and carries out synchronization control in which a frame frequency of the video signals that the composition unit has read out from the storage unit is synchronized with the frame frequency of the selected video signal.
2. The video output apparatus according to claim 1 , wherein the control unit obtains the priority orders that have been set in advance for the auxiliary information for each of the plurality of video signals, and selects the video signal having the priority order that is higher than those of the other video signals by comparing the priority orders of the plurality of video signals.
3. The video output apparatus according to claim 2 , wherein the control unit carries out synchronization control by using the video signal already selected in a case in which there is a video signal having a priority order that is the same as that of the video signal already selected.
4. The video output apparatus according to claim 1 , wherein, in the case in which any of the auxiliary information of the plurality of video signals has changed after carrying out the synchronization control, the control unit obtains the priority orders corresponding to auxiliary information that has changed and again selects the video signal having a priority order that is higher than the other video signals by comparing the priority orders of the plurality of video signals.
5. The video output apparatus according to claim 1 , wherein the auxiliary information is information that includes one or more among packet information that includes a type information for the video of the video signal and information that is superimposed on a vertical blanking interval of the video signal.
6. The video output apparatus according to claim 1 , wherein the auxiliary information includes information that indicates whether the video of the video signal is either of a stopped video or a moving video.
7. A control method that is executed on a video output apparatus that can carry out syntheses processing of a plurality of video signals and output a composed video signal, the method comprising:
inputting the plurality of video signals and an auxiliary information for the video signals;
storing the plurality of video signals that have been input in a storage unit;
obtaining the auxiliary information for the plurality of video signals that have been input and comparing the priority orders corresponding to the auxiliary information;
selecting one video signal from among the plurality of video signals by comparing the priority orders and synchronizing a frame frequency of the video signals that have been read out from the storage unit with the frame frequency of the video signal that has been selected; and
outputting a video signal that has been read out at a frame frequency that has been synchronized.
8. A non-transitory recording medium that records a computer-readable program that is executed on a video output apparatus that can carry out composing processing of a plurality of video signals and output a composed video signal, the medium comprising:
inputting a plurality of video signals and an auxiliary information for the video signals;
storing the plurality of video signals that have been input in a storage unit;
obtaining the auxiliary information for the plurality of video signals that have been input and comparing the priority orders corresponding to the auxiliary information;
selecting one video signal from among the plurality of video signals by comparing the priority orders and synchronizing a frame frequency of the video signals that have been read out from the storage unit with the frame frequency of the video signal that has been selected; and
outputting a video signal that has been read out at a frame frequency that has been synchronized.