如何从服务器创建视频网址的缩略图

Posted 2023-03-29

【中文标题】如何从服务器创建视频网址的缩略图

【英文标题】：How to create thumbnail of video url form server

【发布时间】：2017-12-10 03:30:40

【问题描述】：

如何创建url视频表单服务器的图片/缩略图

而我尝试不工作（不显示缩略图）

String  String url = "http://clips.vorwaerts-gmbh.de/VfE_html5.mp4";

     Bitmap thumb = ThumbnailUtils.createVideoThumbnail(url,MediaStore.Images.Thumbnails.MINI_KIND);

    Glide.with(context).load(thumb).asBitmap()
    /*.override(convertDpToPx(100), convertDpToPx(100))*/
    .placeholder(R.drawable.camera)
    .override(200, 200)
    .diskCacheStrategy(DiskCacheStrategy.ALL)
    .into(new BitmapImageViewTarget(img_view) 
     protected void setResource(Bitmap resource) 
    RoundedBitmapDrawable circularBitmapDrawable =
    RoundedBitmapDrawableFactory.create(context.getResources(), resource);
    //circularBitmapDrawable.setCircular(true);
    img_view.setImageDrawable(circularBitmapDrawable);
       
    );

我被 answer1 搞定了！

但它在缩略图方面遇到了一些问题，它的颜色变化很奇怪。

例子

【问题讨论】：

可能重复：***.com/questions/23522124/…

Is it possible to Generate a thumbnail from a video url in android的可能重复

【参考方案1】：

试试这个 像这​​样创建新的AsyncTask

public class DownloadImage extends AsyncTask<String, Void, Bitmap> 
    ImageView bmImage;

    public DownloadImage(ImageView bmImage) 
        this.bmImage = (ImageView ) bmImage;
    

    protected Bitmap doInBackground(String... urls) 
        Bitmap myBitmap = null;
        MediaMetadataRetriever mMRetriever = null;
        try 
            mMRetriever = new MediaMetadataRetriever();
            if (Build.VERSION.SDK_INT >= 14)
                mMRetriever.setDataSource(urls[0], new HashMap<String, String>());
            else
                mMRetriever.setDataSource(urls[0]);
            myBitmap = mMRetriever.getFrameAtTime();
         catch (Exception e) 
            e.printStackTrace();


         finally 
            if (mMRetriever != null) 
                mMRetriever.release();
            
        
        return myBitmap;
    

    protected void onPostExecute(Bitmap result) 
        bmImage.setImageBitmap(result);
    

不如这样称呼AsyncTask

   new DownloadImage(YourImageView).execute("Your URL");

编辑

或者您也可以使用Glide从网址创建视频缩略图

 RequestOptions requestOptions = new RequestOptions();
 requestOptions.placeholder(R.drawable.placeholder_card_view);
 requestOptions.error(R.drawable.placeholder_card_view);


  Glide.with(getContext())
       .load(path)
       .apply(requestOptions)
       .thumbnail(Glide.with(getContext()).load(path))
       .into(ivVideoThumbnail);

【讨论】：

RequestOptions 未找到。

@NileshRathod DownloadImage 类中的变量“path”是什么，你还没有声明。

@KJEjava48 视频地址

@NileshRathod 我应该如何在这个后台任务中得到它。如果我使用变量“urls”我得到错误

@KJEjava48 If i used variable "urls" i getting error 什么错误？

【参考方案2】：

inner class LoadVideoThumbnail : AsyncTask<String, Any, Bitmap>() 

    override fun doInBackground(vararg objectURL: String): Bitmap 
        //return ThumbnailUtils.createVideoThumbnail(objectURL[0], Thumbnails.MINI_KIND);
        val m = MediaMetadataRetriever()
        m.setDataSource(objectURL[0], HashMap<String, String>())
        var bm = m.getFrameAtTime(-1)
        var decoded: Bitmap? = null
        if (bm != null) 
            val stream = ByteArrayOutputStream()
            bm.compress(Bitmap.CompressFormat.PNG, 20, stream)
            decoded = BitmapFactory.decodeStream(ByteArrayInputStream(stream.toByteArray()))
        
        return decoded!!

    

    override fun onPostExecute(result: Bitmap) 
        //img.setImageBitmap(result);
        Glide.with(this@EditItemsBaseActivity).
                load(result)
                .listener(object:RequestListener<Bitmap, GlideDrawable> 
                    override fun onException(e: java.lang.Exception?, model: Bitmap?,
                                             target: Target<GlideDrawable>?, isFirstResource: Boolean): Boolean 
                        progresBar!!.visibility = View.GONE
                        return false
                    

                    override fun onResourceReady(resource: GlideDrawable?, model: Bitmap?, target: Target<GlideDrawable>?, isFromMemoryCache: Boolean, isFirstResource: Boolean): Boolean 
                        progresBar!!.visibility = View.GONE
                        return false
                    

                ).
                into(videoImageView)

    

LoadVideoThumbnail().execute(videoUrl)