android capture video frame

Question

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 MediaMetadataRetrie

Answer 1

I was getting the same error using the ThumbnailUtils class http://developer.android.com/reference/android/media/ThumbnailUtils.html
It uses MediaMetadataRetriever under the hood and most of the time you can send it a filepath using this method with no problem:

public static Bitmap createVideoThumbnail (String filePath, int kind)  

However, on Android 4.0.4, I kept getting the same error @gabi was seeing. Using a file descriptor instead solved the problem and still works for non-4.0.4 devices. I actually ended up subclassing ThumbnailUtils. Here is my subclass method:

 public static Bitmap createVideoThumbnail(FileDescriptor fDescriptor, int kind) 
 {
    Bitmap bitmap = null;
    MediaMetadataRetriever retriever = new MediaMetadataRetriever();
    try {
        retriever.setDataSource(fDescriptor);
        bitmap = retriever.getFrameAtTime(-1);
    } 
    catch (IllegalArgumentException ex) {
        // Assume this is a corrupt video file
        Log.e(LOG_TAG, "Failed to create video thumbnail for file description: " + fDescriptor.toString());
    }
    catch (RuntimeException ex) {
        // Assume this is a corrupt video file.
        Log.e(LOG_TAG, "Failed to create video thumbnail for file description: " + fDescriptor.toString());
    } finally {
        try {
            retriever.release();
        } catch (RuntimeException ex) {
            // Ignore failures while cleaning up.
        }
    }

    if (bitmap == null) return null;

    if (kind == Images.Thumbnails.MINI_KIND) {
        // Scale down the bitmap if it's too large.
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        int max = Math.max(width, height);
        if (max > 512) {
            float scale = 512f / max;
            int w = Math.round(scale * width);
            int h = Math.round(scale * height);
            bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
        }
    } else if (kind == Images.Thumbnails.MICRO_KIND) {
        bitmap = extractThumbnail(bitmap,
                TARGET_SIZE_MICRO_THUMBNAIL,
                TARGET_SIZE_MICRO_THUMBNAIL,
                OPTIONS_RECYCLE_INPUT);
    }
    return bitmap;
}