Get video duration from FileDescriptor or ParcelFileDescriptor

Question

I've been using this type of code to get the duration of videos on my Android device:

            int dataColumn = cursor
                    .getColumnIndex(MediaStore.Files.FileColumns.DATA);
            String path = cursor.getString(dataColumn);

            MediaMetadataRetriever retriever = new MediaMetadataRetriever();
            File file = new File(path);
            retriever.setDataSource(context, Uri.fromFile(file));
            boolean hasVideo = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO).equals("yes");
            String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
            int duration = 0;
            if (time != null && hasVideo) {
                duration = (int) Math.ceil(Integer.parseInt(time) / 1000);
            }

This was working until I began to target Android 11 (API level 30) in my app. Now the duration is always reported as 0. I can see that MediaStore.Files.FileColumns.DATA was deprecated beginning with Android 10 (API level 29), and ContentResolver.openFileDescriptor is the recommended alternative. However, I don't know how to get a video's duration from a ParcelFileDescriptor or FileDescriptor. I also haven't been able to find resources that demonstrate how to do so. So, how can I do that?

I've also tried other possible solutions, none of which have worked:

• Using retriever.setDataSource(file.getAbsolutePath()) instead of retriever.setDataSource(context, Uri.fromFile(file)). I saw that here and here, so I tried it but it didn't work (the duration is still zero)
• I tried querying the duration field directly from the MediaStore but it still didn't work. This was the code I used:

                            int vidDurationColumn = cursor.getColumnIndex(MediaStore.Video.Media.DURATION);
                            int duration = (int)cursor.getInt(vidDurationColumn);

So yeah, I'm open to any ideas that work. Thanks!