如何在与vuforia SDK运行时改变视频 [英] How to change video at runtime with vuforia SDK
问题描述
我在Android上使用vuforia SDK和我与videoplayback样品code工作。我想改变的视频源文件在运行时。要做到这一点，当我想加载一个新的视频文件，首先我改变视频文件的名称是这样的：
mMovieName [0] = Environment.getExternalStorageDirectory（）的getPath（）+/ video1.mp4。
我从开始时加载它检查的路径，视频文件，它是正确的。
我把这个线在此方法：
onQCARUpdate（州州）
这是在相等的时间步运行。然后，我加载新的视频像这样在相同的方式：
mRenderer.requestLoad（0，mMovieName [0]，0，FALSE）;
所以最后它看起来是这样的：
@覆盖
公共无效onQCARUpdate（州州）
{
如果（loadNewVideo）
{
。mMovieName [0] = Environment.getExternalStorageDirectory（）的getPath（）+/ video1.mp4;
mRenderer.requestLoad（0，mMovieName [0]，0，假）;
}
}
但问题是，没有什么变化。最初的视频会继续，因为它是正在播放，并没有任何错误或崩溃。我应该做的事情除了这些也抑或是我完全关闭？
编辑：
我实际上并没有加载视频。现在我打电话videoHelper的加载方法，但仍是视频不会改变。它只是冻结，我可以听到它的声音。
在VideoPlayback.java有一次，我一个水龙头发生添加了这个方法，我在里面叫onQCarUpdate：
私人布尔changeVideo（）
{
布尔结果= TRUE; mMovieName [STONES] = Environment.getExternalStorageDirectory（）的getPath（）+/ video1.mp4。
mRenderer.requestLoad（石头，mMovieName [STONES]，0，FALSE）;
mRenderer.loadVideo（STONES）; 返回结果;
}
还增加了这种方法来VideoPlaybackRenderer.java（我只是复制这些从onSurfaceChanged）：
公共无效loadVideo（int i）以
{
如果（mVideoPlayerHelper [I]！= NULL）
{
如果（！mVideoPlayerHelper [I]
.setupSurfaceTexture（videoPlaybackTextureID [I]））
mCanRequestType [I] = MEDIA_TYPE.FULLSCREEN;
其他
mCanRequestType [I] = MEDIA_TYPE.ON_TEXTURE_FULLSCREEN; 如果（mLoadRequested [I]）
{
mVideoPlayerHelper [I] .load（mMovieName [I]
mCanRequestType [I]中，mShouldPlayImmediately [I]
mSeekPosition [I]）;
mLoadRequested [I] = FALSE;
}
}
}
到视频的地址是罚款。我试图加载它作为第一个视频和它起着罚款。这两部影片都在SD存储和我修改VideoHelper.java从SD加载。我还检查它并进入loadVideo一旦我点击目标之外。
编辑：
我装了一个新的视频等什么工作是在此之前卸载：
公共无效loadVideo（int i）以
{
如果（mVideoPlayerHelper [I]！= NULL）
{
mVideoPlayerHelper [I] .unload（）;
如果（！mVideoPlayerHelper [I]
.setupSurfaceTexture（videoPlaybackTextureID [I]））
mCanRequestType [I] = MEDIA_TYPE.FULLSCREEN;
其他
mCanRequestType [I] = MEDIA_TYPE.ON_TEXTURE_FULLSCREEN; 如果（mLoadRequested [I]）
{
mVideoPlayerHelper [I] .load（mMovieName [I]
mCanRequestType [I]中，mShouldPlayImmediately [I]
mSeekPosition [I]）;
mLoadRequested [I] = FALSE;
}
}
}
如果你探索code，你可以看到requestLoad方法不做任何事，但equalation：
公共无效requestLoad（INT目标，弦乐的movieName，INT seekPosition，
布尔playImmediately）
{
mMovieName [目标] =的movieName;
mSeekPosition [目标] = seekPosition;
mShouldPlayImmediately [目标] = playImmediately;
mLoadRequested [目标] =真;
}
您需要加载视频的渲染器类：
mVideoPlayerHelper [I] .load（mMovieName，mCanRequestType，mShouldPlayImmediately，mSeekPosition）;
I'm using vuforia SDK on android and I'm working with videoplayback sample code. I want to change the source file of the video at runtime. To do that, when I want to load a new video file, first I change the video file name like this:
mMovieName[0] = Environment.getExternalStorageDirectory().getPath()+"/video1.mp4";
I checked the path to the video file by loading it from the begining and it's correct. I put this line in this method:
onQCARUpdate(State state)
which is run in equal time steps. Then I load the new video like this in the same method:
mRenderer.requestLoad(0, mMovieName[0], 0, false);
SO in the end it looks like this:
@Override
public void onQCARUpdate(State state)
{
if(loadNewVideo)
{
mMovieName[0] = Environment.getExternalStorageDirectory().getPath()+"/video1.mp4";
mRenderer.requestLoad(0, mMovieName[0], 0, false);
}
}
But the problem is that nothing changes. The initial video continues as it was being played and no errors or crashes. Should I do something aside from these too or is it that I'm completely off?
EDIT:
I was not actually loading the video. I'm calling load method of videoHelper now but still the video doesn't change. It just freezes and I can hear its sounds.
In VideoPlayback.java I added this method which I'm calling inside onQCarUpdate once a single tap happens:
private boolean changeVideo()
{
boolean result = true;
mMovieName[STONES] = Environment.getExternalStorageDirectory().getPath()+"/video1.mp4";
mRenderer.requestLoad(STONES, mMovieName[STONES], 0, false);
mRenderer.loadVideo(STONES);
return result;
}
Also added this method to VideoPlaybackRenderer.java (I just copied these from onSurfaceChanged):
public void loadVideo(int i)
{
if (mVideoPlayerHelper[i] != null)
{
if (!mVideoPlayerHelper[i]
.setupSurfaceTexture(videoPlaybackTextureID[i]))
mCanRequestType[i] = MEDIA_TYPE.FULLSCREEN;
else
mCanRequestType[i] = MEDIA_TYPE.ON_TEXTURE_FULLSCREEN;
if (mLoadRequested[i])
{
mVideoPlayerHelper[i].load(mMovieName[i],
mCanRequestType[i], mShouldPlayImmediately[i],
mSeekPosition[i]);
mLoadRequested[i] = false;
}
}
}
The address to the video is fine. I tried loading it as the first video and it plays fine. Both videos are on SD storage and I've modified VideoHelper.java to load from SD. I also checked and it does go into loadVideo once I tap outside the target.
EDIT:
I had to unload before loading a new video so what worked was this:
public void loadVideo(int i)
{
if (mVideoPlayerHelper[i] != null)
{
mVideoPlayerHelper[i].unload();
if (!mVideoPlayerHelper[i]
.setupSurfaceTexture(videoPlaybackTextureID[i]))
mCanRequestType[i] = MEDIA_TYPE.FULLSCREEN;
else
mCanRequestType[i] = MEDIA_TYPE.ON_TEXTURE_FULLSCREEN;
if (mLoadRequested[i])
{
mVideoPlayerHelper[i].load(mMovieName[i],
mCanRequestType[i], mShouldPlayImmediately[i],
mSeekPosition[i]);
mLoadRequested[i] = false;
}
}
}
if you explore the code, you can see the requestLoad method does nothing but equalation:
public void requestLoad(int target, String movieName, int seekPosition,
boolean playImmediately)
{
mMovieName[target] = movieName;
mSeekPosition[target] = seekPosition;
mShouldPlayImmediately[target] = playImmediately;
mLoadRequested[target] = true;
}
You need to load the video in the Renderer Class:
mVideoPlayerHelper[i].load(mMovieName, mCanRequestType, mShouldPlayImmediately, mSeekPosition);
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