我是 MATLAB 的新手。我正在尝试创建一个 GUI 来逐帧播放、暂停、快进和倒带 avi 视频。目前我可以通过切换按钮播放和暂停视频，但是当我再次按下播放时，视频从零帧开始播放。我意识到我需要存储要在下次按播放时使用的帧号，但我不知道该怎么做。任何帮助将非常感激。我意识到 MATLAB 中有一个 implay 选项，但我还有一些其他代码要实现，我已经做对了，这就是我想创建自己的 GUI 的原因。下面是暂停/播放视频的代码。
我最近的代码看起来像，
function varargout = N_Play_Pause_2(varargin)
% N_PLAY_PAUSE_2 MATLAB code for N_Play_Pause_2.fig
% N_PLAY_PAUSE_2, by itself, creates a new N_PLAY_PAUSE_2 or raises the existing
% singleton*.
%
% H = N_PLAY_PAUSE_2 returns the handle to a new N_PLAY_PAUSE_2 or the handle to
% the existing singleton*.
%
% N_PLAY_PAUSE_2('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in N_PLAY_PAUSE_2.M with the given input arguments.
%
% N_PLAY_PAUSE_2('Property','Value',...) creates a new N_PLAY_PAUSE_2 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before N_Play_Pause_2_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to N_Play_Pause_2_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help N_Play_Pause_2
% Last Modified by GUIDE v2.5 29-Aug-2013 08:39:38
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @N_Play_Pause_2_OpeningFcn, ...
'gui_OutputFcn', @N_Play_Pause_2_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before N_Play_Pause_2 is made visible.
function N_Play_Pause_2_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to N_Play_Pause_2 (see VARARGIN)
% Choose default command line output for N_Play_Pause_2
handles.output = hObject;
handles.VidObj = VideoReader('x05.avi');
handles.nFrames = handles.VidObj.NumberOfFrames;
handles.videoPos = 1; %Current video position. Starts at 1.
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes N_Play_Pause_2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = N_Play_Pause_2_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes on button press in togglebutton1.
function togglebutton1_Callback(hObject, eventdata, handles)
% hObject handle to togglebutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of togglebutton1
while get(hObject,'Value')
snapshot = read(handles.VidObj,handles.videoPos); % Here we use the stored video position
if handles.videoPos >= handles.nFrames % Protect your code not to go be number of frames available
break;
end
handles.videoPos=handles.videoPos+1; % Increment the stored position
imshow(snapshot),title(handles.videoPos);
end
guidata(hObject,handles) % Save the modifications done at the handles structure at the figure handle
set(hObject,'Value',false);
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if get(hObject,'Value')
snapshot = read(handles.VidObj,handles.videoPos); % Here we use the stored video position
handles.videoPos=handles.videoPos+1; % Increment the stored position
imshow(snapshot),title(handles.videoPos);
end
guidata(hObject,handles) % Save the modifications done at the handles structure at the figure handle
set(hObject,'Value',false);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if get(hObject,'Value')
snapshot = read(handles.VidObj,handles.videoPos); % Here we use the stored video position
handles.videoPos=handles.videoPos-1; % Increment the stored position
imshow(snapshot),title(handles.videoPos);
end
guidata(hObject,handles) % Save the modifications done at the handles structure at the figure handle
set(hObject,'Value',false);
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if get(hObject,'Value')
snapshot = read(handles.VidObj,handles.videoPos); % Here we use the stored video position
handles.videoPos=handles.videoPos+10; % Increment the stored position
imshow(snapshot),title(handles.videoPos);
end
guidata(hObject,handles) % Save the modifications done at the handles structure at the figure handle
set(hObject,'Value',false);
% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if get(hObject,'Value')
snapshot = read(handles.VidObj,handles.videoPos); % Here we use the stored video position
handles.videoPos=handles.videoPos-10; % Increment the stored position
imshow(snapshot),title(handles.videoPos);
end
guidata(hObject,handles) % Save the modifications done at the handles structure at the figure handle
set(hObject,'Value',false);