How do you set an initial position with pre-roll ad

[TakuSemba]

[REQUIRED] Issue description

When playing video seeking somewhere in between and have a pre-roll ad, the pre-roll ad starts first and video starts playing from the beginning after, but I think it should start playing from the seeked position after the pre-roll ad.

[REQUIRED] Reproduction steps

You can reproduce this with ExoPlayer demo app.

1. add samples

      {
        "name": "test pre",
        "uri": "https://storage.googleapis.com/exoplayer-test-media-1/mkv/android-screens-lavf-56.36.100-aac-avc-main-1280x720.mkv",
        "ad_tag_uri": "https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/ad_rule_samples&ciu_szs=300x250&ad_rule=1&impl=s&gdfp_req=1&env=vp&output=vmap&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ar%3Dpreonly&cmsid=496&vid=short_onecue&correlator="
      },
      {
        "name": "test pre+mid (does not happen if you seek beyond mid-roll.)",
        "uri": "https://storage.googleapis.com/exoplayer-test-media-1/mkv/android-screens-lavf-56.36.100-aac-avc-main-1280x720.mkv",
        "ad_tag_uri": "https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/ad_rule_samples&ciu_szs=300x250&ad_rule=1&impl=s&gdfp_req=1&env=vp&output=vmap&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ar%3Dpremidpost&cmsid=496&vid=short_onecue&correlator="
      },

2. seek

  private void initializePlayer() {
    ...
//    if (haveStartPosition) {
//      player.seekTo(startWindow, startPosition);
//    }
    player.seekTo(30 * 1000);
    player.prepare(mediaSource, false, false);
    ...
  }

[REQUIRED] Link to test content

• pre-roll ad tag: https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/ad_rule_samples&ciu_szs=300x250&ad_rule=1&impl=s&gdfp_req=1&env=vp&output=vmap&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ar%3Dpreonly&cmsid=496&vid=short_onecue&correlator=

• mid-roll ad tag: https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/ad_rule_samples&ciu_szs=300x250&ad_rule=1&impl=s&gdfp_req=1&env=vp&output=vmap&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ar%3Dpremidpost&cmsid=496&vid=short_onecue&correlator=

(Even though this issue is not specific to this ad tag urls.)

[REQUIRED] A full bug report captured from the device

bugreport-blueline-QPP3.190404.015-2019-07-19-15-31-34.zip

[REQUIRED] Version of ExoPlayer being used

r2.10.3

[REQUIRED] Device(s) and version(s) of Android being used

Pixcel3 (AndroidQ)

[tonihei]

Thanks for reporting! Good news is, we discovered this issue a couple of days ago internally and it's already fixed.

[tonihei]

For future reference and in case you want to try it out: The fix is in 049f3cf.

[TakuSemba]

Great!

[ZhiJia-Zheng]

Hey @tonihei thanks for your fix, after testing I still meet a problem:for a video asset, if purely play it in title page(not full screen) or in full screen directly, the seek position works well after pre-roll, but if play it in title page for a while, exit and then play it by full screen directly, the seek position will still be ignored, vice versa.