在 Android 中的 VideoView 中播放视频
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Playing a video in VideoView in Android
提问by Muhammad Maqsoodur Rehman
I can't figure out why I'm not able to play the video in my VideoView. All I'm getting for a message is:
我不知道为什么我无法在 VideoView 中播放视频。我收到的消息是：
Cannot Play Video : Sorry, this video cannot be played.
无法播放视频：抱歉，此视频无法播放。
I created an SD card for my emulator as well. Do I need to place my SD card in a particular folder in my SDK? Please comment.
我也为我的模拟器创建了一个 SD 卡。我需要将我的 SD 卡放在我的 SDK 中的特定文件夹中吗？请给出意见。
Here's the layout:
这是布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/LinearLayout01"
android:layout_height="fill_parent"
android:paddingLeft="2px"
android:paddingRight="2px"
xmlns:android="http://schemas.android.com/apk/res/android"
android:paddingTop="2px"
android:paddingBottom="2px"
android:layout_width="fill_parent"
android:orientation="vertical">
<VideoView
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:id="@+id/VideoView" />
</LinearLayout>
Here's the code:
这是代码：
package com.examples.videoviewdemo;
import android.app.Activity;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;
public class VideoViewDemo extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
VideoView videoView = (VideoView)findViewById(R.id.VideoView);
//MediaController mediaController = new MediaController(this);
// mediaController.setAnchorView(videoView);
//videoView.setMediaController(mediaController);
videoView.setVideoPath("/sdcard/blonde_secretary.3gp");
videoView.start();
}
}
Waiting for the reply...
等待回复...
采纳答案by CommonsWare
My guess is that your video is incompatible with Android. Try it with a different video. This onedefinitely worksused to work with Android (but does not on newer devices, for some reason). If that video works, and yours does not, then your video is not compatible with Android.
我的猜测是您的视频与 Android 不兼容。用不同的视频试试。这个肯定适用于Android（但由于某种原因不适用于较新的设备）。如果该视频有效，而您的无效，则您的视频与 Android 不兼容。
As others have indicated, please test this on a device. Video playback on the emulator requires too much power.
正如其他人所指出的，请在设备上进行测试。在模拟器上播放视频需要太多电量。
UPDATE 2020-02-18: https://law.duke.edu/cspd/contest/videos/Framed-Contest_Documentaries-and-You.mp4is an MP4 of the same content, but I have no idea if it is the same actual MP4 as I previously linked to.
2020-02-18 更新：https: //law.duke.edu/cspd/contest/videos/Framed-Contest_Documentaries-and-You.mp4是相同内容的 MP4，但我不知道它是否相同我之前链接到的实际 MP4。
回答by Suragch
Example Project
示例项目
I finally got a proof-of-concept project to work, so I will share it here.
我终于得到了一个可以工作的概念验证项目，所以我将在这里分享。
Set up the layout
设置布局
The layout is set up like this, where the light grey area is the VideoView.
布局是这样设置的，其中浅灰色区域是VideoView.
activity_main.xml
活动_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.videotest.MainActivity">
<VideoView
android:id="@+id/videoview"
android:layout_width="300dp"
android:layout_height="200dp"/>
<Button
android:text="Play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/videoview"
android:onClick="onButtonClick"
android:id="@+id/button"/>
</RelativeLayout>
Prepare video clip
准备视频剪辑
According to the documentation, Android should support mp4 H.264 playback (decoding) for all API levels. However, there seem to be a lot of factors that affect whether an actual video will play or not. The most in depth answer I could find that told how to encode the videos is here. It uses the powerful ffmpegcommand line tool to do the conversion to something that should be playable on all (hopefully?) Android devices. Read the answer I linked to for more explanation. I used a slightly modified version because I was getting errors with the original version.
根据文档，Android 应该支持所有 API 级别的 mp4 H.264 播放（解码）。但是，似乎有很多因素会影响实际视频是否会播放。我能找到的关于如何编码视频的最深入的答案是here。它使用强大的ffmpeg命令行工具来转换为应该在所有（希望？）Android 设备上播放的内容。阅读我链接的答案以获取更多解释。我使用了一个稍微修改过的版本，因为原始版本出现错误。
ffmpeg -y -i input_file.avi -s 432x320 -b:v 384k -vcodec libx264 -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8 -subq 6 -trellis 0 -refs 5 -bf 0 -coder 0 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -c:a aac -ac 1 -ar 16000 -r 13 -ab 32000 -aspect 3:2 -strict -2 output_file.mp4
I would definitely read up a lot more on each of those parameters to see which need adjusting as far as video and audio quality go.
我肯定会阅读更多关于每个参数的信息，看看哪些参数需要在视频和音频质量方面进行调整。
Next, rename output_file.mp4to test.mp4and put it in your Android project's /res/rawfolder. Create the folder if it doesn't exist already.
接下来，将其重命名output_file.mp4为test.mp4并将其放入您的 Android 项目的/res/raw文件夹中。如果文件夹不存在，则创建该文件夹。
Code
代码
There is not much to the code. The video plays when the "Play" button is clicked. Thanks to this answerfor help.
代码不多。单击“播放”按钮时会播放视频。感谢这个答案的帮助。
MainActivity.java
主活动.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onButtonClick(View v) {
VideoView videoview = (VideoView) findViewById(R.id.videoview);
Uri uri = Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.test);
videoview.setVideoURI(uri);
videoview.start();
}
}
Finished
完成的
That's all. You should be able play your video clip on the simulator or a real device now.
就这样。您现在应该可以在模拟器或真实设备上播放您的视频剪辑了。
回答by DJ7
Make videoViewa member variable of your activity class instead of keeping it as local to the onCreatefunction:
让videoView您的活动类的成员变量，而不是保持它作为本地的的onCreate功能：
VideoView videoView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
videoView = (VideoView)findViewById(R.id.VideoView);
videoView.setVideoPath("/sdcard/blonde_secretary.3gp");
videoView.start();
}
回答by Sharat
Add android.permission.READ_EXTERNAL_STORAGE in manifest, worked for me
在清单中添加 android.permission.READ_EXTERNAL_STORAGE，对我有用
回答by Vikash Kumar Verma
VideoView videoView =(VideoView) findViewById(R.id.videoViewId);
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath()+"/yourvideo");
videoView.setVideoURI(uri);
videoView.start();
Instead of using setVideoPath use setVideoUri. you can get path of your video stored in external storage by using (Environment.getExternalStorageDirectory().getAbsolutePath()+"/yourvideo")and parse it into Uri. If your video is stored in sdcard/MyVideo/video.mp4 replace "/yourvideo" in code by "/MyVideo/video.mp4"
而不是使用 setVideoPath 使用 setVideoUri。您可以使用 (Environment.getExternalStorageDirectory().getAbsolutePath()+"/yourvideo") 获取存储在外部存储中的视频路径并将其解析为 Uri。如果您的视频存储在 sdcard/MyVideo/video.mp4 中，请将代码中的“/yourvideo”替换为“/MyVideo/video.mp4”
This works fine for me :) `
这对我来说很好用 :) `
回答by Jaymelson Galang
VideoView can only Stream 3gp videos I recommend this code to stream your video or try a higher version of android. Try Video Online Streaming.
VideoView 只能流式传输 3gp 视频我推荐此代码来流式传输您的视频或尝试更高版本的 android。尝试视频在线流媒体。
public void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.main);
String videourl = "http://something.com/blah.mp4";
Uri uri = Uri.parse(videourl);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
intent.setDataAndType(uri, "video/mp4");
startActivity(intent);
}
回答by Tr0yJ
To confirm you video is in the correct format (resolution, bitrate, codec, etc.) check with the official documentation- extract below:
要确认您的视频格式正确（分辨率、比特率、编解码器等），请查看官方文档- 摘录如下：
Standard definition (Low quality)
Video codec - H.264
Video resolution - 176 x 144 px
Video frame rate - 12 fps
Video bitrate - 56 Kbps
Audio codec - AAC-LC
Audio channels - (mono)
Audio bitrate - 24 Kbps
标准清晰度（低质量）
视频编解码器 - H.264
视频分辨率 - 176 x 144 px
视频帧速率 - 12 fps
视频比特率 - 56 Kbps
音频编解码器 - AAC-LC
音频通道 -（单声道）
音频比特率 - 24 Kbps
Standard definition (High quality)
Video codec - H.264
Video resolution - 480 x 360 px
Video frame rate - 30 fps
Video bitrate - 500 Kbps
Audio codec - AAC-LC
Audio channels - 2 (stereo)
Audio bitrate - 128 Kbps
标准清晰度（高质量）
视频编解码器 - H.264
视频分辨率 - 480 x 360 px
视频帧速率 - 30 fps
视频比特率 - 500 Kbps
音频编解码器 - AAC-LC
音频通道 - 2（立体声）
音频比特率 - 128 Kbps
High definition 720p (N/A on all devices)
Video codec - H.264
Video resolution - 1280 x 720 px
Video frame rate - 30 fps
Video bitrate - 2 Mbps
Audio codec - AAC-LC
Audio channels - 2 (stereo)
Audio bitrate - 192 Kbps
高清 720p（适用于所有设备）
视频编解码器 - H.264
视频分辨率 - 1280 x 720 px
视频帧速率 - 30 fps
视频比特率 - 2 Mbps
音频编解码器 - AAC-LC
音频通道 - 2（立体声）
音频比特率- 192 Kbps
回答by Igor
The code seems to be flawless!
Simple and plain.
So it should work on the phone. The emulator is having hard time playing videos, it happened to me too.
代码似乎完美无缺！简单明了。
所以它应该在手机上工作。模拟器很难播放视频，这也发生在我身上。
Try increasing the required API level to the latest, it might help!
尝试将所需的 API 级别提高到最新，它可能会有所帮助！
Right click on opened project, chose Properties > Android > check the latest version on the right side...
右键单击打开的项目，选择“属性”>“Android”> 在右侧检查最新版本...
Igor
伊戈尔
回答by poeschlorn
You can access your SD card via the DDMS
您可以通过 DDMS 访问您的 SD 卡
回答by Suresh Sharma
Well ! if you are using a android Compatibility Video then the only cause of this alert is you must be using a video sized more then the 300MB. Android doesn't support large Video (>300MB). We can get it by using NDK optimization.
好 ！如果您使用的是 android 兼容性视频，那么此警报的唯一原因是您必须使用大小超过 300MB 的视频。Android 不支持大视频 (>300MB)。我们可以通过使用 NDK 优化来获得它。
