滑行-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逐步浏览视频文件中的帧(而不会遇到Android遭受的关键帧搜索问题).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只是一个整数，每次增加50000微秒).我也有这样的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中拥有此功能?

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，实际上，可以通过其他任何方式从视频中创建一组框架，

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)"才能使Sam Judd的方法起作用.否则，由于我已经测试了数小时的各种方法，因此您只会得到视频的第一帧.希望它可以为某人节省时间.

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);

这篇关于滑行-在特定时间从视频加载单帧?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！