Glide - 在特定时间从视频加载单帧? [英] Glide - load single frame from video at specific time?

问题描述

我正在尝试使用 Glide 来逐步浏览视频文件中的帧(而不会遇到 Android 遇到的关键帧搜索问题).我可以通过以下方式在毕加索中做到这一点:

I'm trying to use Glide to step through frames in a video file (without running into the keyframe seeking issue that Android suffers from). I can do this in Picasso by doing something like:

picasso = new Picasso.Builder(MainActivity.this).addRequestHandler(new PicassoVideoFrameRequestHandler()).build();
picasso.load("videoframe://" + Environment.getExternalStorageDirectory().toString() +
                    "/source.mp4#" + frameNumber)
                    .placeholder(drawable)
                    .memoryPolicy(MemoryPolicy.NO_CACHE)
                    .into(imageView);

(frameNumber 只是一个 int，每次增加 50000 微秒).我也有一个像这样的 PicassoVideoFrameRequestHandler:

(frameNumber is simply an int which increases by 50000 microseconds each time). I also have a PicassoVideoFrameRequestHandler like this:

public class PicassoVideoFrameRequestHandler extends RequestHandler {
public static final String SCHEME = "videoframe";

@Override public boolean canHandleRequest(Request data) {
    return SCHEME.equals(data.uri.getScheme());
}

@Override
public Result load(Request data, int networkPolicy) throws IOException {
    FFmpegMediaMetadataRetriever mediaMetadataRetriever = new FFmpegMediaMetadataRetriever();
    mediaMetadataRetriever.setDataSource(data.uri.getPath());
    String offsetString = data.uri.getFragment();
    long offset = Long.parseLong(offsetString);
    Bitmap bitmap = mediaMetadataRetriever.getFrameAtTime(offset, FFmpegMediaMetadataRetriever.OPTION_CLOSEST);
    return new Result(bitmap, Picasso.LoadedFrom.DISK);
}

}

我想改用 Glide，因为它可以更好地处理内存.有什么办法可以在 Glide 中实现这个功能吗?

I'd like to use Glide instead, as it handles memory a little better. Is there any way to have this functionality in Glide?

或者，真的，任何其他方式从视频创建一组我可以逐步完成的帧！

Or, really, any other way to create a set of frames from a video which I can step through!

谢谢！

推荐答案

您需要传递.override(width, height)"以使 Sam Judd 的方法起作用.否则你只会得到视频的第一帧，因为我已经测试了几个小时的各种方法.希望它为某人节省时间.

You'll need to pass ".override(width, height)" to make Sam Judd's method to work. Otherwise you'll get only the first frame of the video as I've tested variety of approaches for hours. Hope it saves time for someone.

BitmapPool bitmapPool = Glide.get(getApplicationContext()).getBitmapPool();
int microSecond = 6000000;// 6th second as an example
VideoBitmapDecoder videoBitmapDecoder = new VideoBitmapDecoder(microSecond);
FileDescriptorBitmapDecoder fileDescriptorBitmapDecoder = new FileDescriptorBitmapDecoder(videoBitmapDecoder, bitmapPool, DecodeFormat.PREFER_ARGB_8888);
Glide.with(getApplicationContext())
    .load(yourUri)
    .asBitmap()
    .override(50,50)// Example
    .videoDecoder(fileDescriptorBitmapDecoder)
    .into(yourImageView);

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