How to play video with HLS interstitials from a specified position after ads?

[aaxb]

If set a seek time for the video(with HLS interstitials) to start playing from a specified position
a. seek positio is after any ad position, the screen is black and not show ad or media contents.
b. seek position is before the ads, the player can work well.

Exoplayer version: 1.8.0-alpha01
Steps:
Set HlsInterstitialsAdsLoader as https://developer.android.com/media/media3/exoplayer/hls#interstitials

player.setMediaItem(
    new MediaItem.Builder()
        .setUri("https://www.example.com/media.m3u8")
        .setAdsConfiguration(
            new AdsConfiguration.Builder(Uri.parse("hls://interstitials"))
                .setAdsId("ad-tag-0") // must be unique within playlist
                .build())
        .build());
player.seekTo(seekPosition); //just add this line for start position
player.prepare();
player.play();

Is this an issue or how to play video with HLS interstitials from a specified position after ads?

[marcbaechinger]

Thanks for your report!

That's a bug in HlsInterstitialsAdsLoader. I can repro this with a unit tests and a sample stream with the player when using asset lists. We'll provide a fix for this.

When the timeline is updated and the position is before a mid roll, the content position needs to be resolved for an ad start position before being used to select the next asset list to be fetched. This way, the initial selection when joining the stream is behaving as for a seek, which is the correct behavior for VOD and live.