FFmpegMediaMetadataRetriever and MediaMetadataRetriever crash no matter what is set as datasource (kotlin), even with valid URI tested with videoview

I seem to be running into a strange issue with MediaMetadataRetriever and FFmpegMediaMetadataRetriever.

I have a videoView from which I want to extract the last frame, and I am using MediaMetadataRetriever which needs to set a datasource.

However whenever I set this datasource with the same URI as the videoview, I get

    java.lang.IllegalArgumentException: setDataSource failed: status = 0xFFFFFFFF
        at wseemann.media.FFmpegMediaMetadataRetriever.setDataSource(Native Method)

Even if I hardcode the following:

retriever.setDataSource("android.resource://" + mActivity.packageName + "/" +  R.raw.step3_r0man2

It still does nothing. However the videoview in question uses the exact same URL and has no problem playing the video

I've also tried the following:

retriever.setDataSource(context, url)

Same result.

This is all done within an android fragment in kotlin.

open fun configureVideoPlayer() {
        videoUrl?.let { url ->
            vvStepVideo.setVideoURI(url)

            vvStepVideo.setOnPreparedListener(MediaPlayer.OnPreparedListener { player ->
                val videoRatio = player.videoWidth / player.videoHeight.toFloat()
                val screenRatio = vvStepVideo.width / vvStepVideo.height.toFloat()
                val scaleX = videoRatio / screenRatio
                if (scaleX >= 1f) {
                    vvStepVideo.scaleX = scaleX
                } else {
                    vvStepVideo.scaleY = 1f / scaleX
                }
                if (!vvStepVideo.isPlaying) {
                    vvStepVideo.start()
                    player.isLooping = shouldLoopVideo
                    audioTrack?.let {
                        configureAudio(it, false)
                        val currentLocale = ConfigurationCompat.getLocales(resources.configuration)[0]
                        if (!currentLocale.toString().startsWith("en_")) {
                            player.setVolume(0.0f, 0.0f)
                        }
                    }
                } else {
                    vvStepVideo.stopPlayback()
                }
            })

            if (!shouldLoopVideo) {
                vvStepVideo.setOnCompletionListener { player ->
                    btnReplayVideo.visibility = View.VISIBLE
                    btnScanQRCode.visibility = View.VISIBLE
                    tvFirstScan.visibility = View.GONE
                    blur.visibility = View.VISIBLE

                    val retriever = FFmpegMediaMetadataRetriever()
                    retriever.setDataSource(url.toString())
                    //always crashes here ^
//                    val bitmap = retriever.getFrameAtTime(vvStepVideo.currentPosition.toLong() * 1000)
//
//                    Blurry.with(context).from(bitmap).into(blur)

                }
            }
        }
    }

Here are the dependencies:

implementation 'jp.wasabeef:blurry:4.0.0'
implementation 'com.github.wseemann:FFmpegMediaMetadataRetriever-core:1.0.15'
implementation 'com.github.wseemann:FFmpegMediaMetadataRetriever-native:1.0.15'

I've also followed: MediaMetadataRetriever setDataSource throws IllegalArgumentException

And nothing works :(

Not sure what's going on. Is there another way to get the last frame of a video, blur it with blurry, then set it to an imageview?