android捕获视频帧 [英] android capture video frame

问题描述

我需要获取视频文件的一帧(它可能在 sdcard、缓存目录或应用程序目录中).我的应用程序中有 android.media 包，里面有 MediaMetadataRetriever 类.要将第一帧转换为位图，我使用代码:

I need to get a frame of a video file (it may be on sdcard, cache dir or app dir). I have package android.media in my application and inside I have class MediaMetadataRetriever. To get first frame into a bitmap, I use code:

public static Bitmap getVideoFrame(Context context, Uri videoUri) {
    MediaMetadataRetriever retriever = new MediaMetadataRetriever();
    try {
        retriever.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
        retriever.setDataSource(context, videoUri);
        return retriever.captureFrame();
    } catch (IllegalArgumentException ex) {
        throw new RuntimeException();
    } catch (RuntimeException ex) {
        throw new RuntimeException();
    } finally {
        retriever.release();
    }
}

但这行不通.当我设置数据源时，它会抛出异常 (java.lang.RuntimeException: setDataSource failed: status = 0x80000000).你知道如何使这段代码工作吗?或者您是否有不使用 ffmpeg 或其他外部库的类似(简单)解决方案?videoUri 是有效的 uri(媒体播放器可以从该 URI 播放视频)

But this it's not working. It throws an exception (java.lang.RuntimeException: setDataSource failed: status = 0x80000000) when I set data source. Do you know how to make this code to work? Or Do you have any similar (simple) solution without using ffmpeg or other external libraries? videoUri is a valid uri (media player can play video from that URI)

推荐答案

以下对我有用:

public static Bitmap getVideoFrame(FileDescriptor FD) {
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        try {
            retriever.setDataSource(FD);
            return retriever.getFrameAtTime();
        } catch (IllegalArgumentException ex) {
            ex.printStackTrace();
        } catch (RuntimeException ex) {
            ex.printStackTrace();
        } finally {
            try {
                retriever.release();
            } catch (RuntimeException ex) {
            }
        }
        return null;
    }

如果您使用路径而不是文件描述符也可以使用.

Also works if you use a path instead of a filedescriptor.

这篇关于android捕获视频帧的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！