Is there a way to download metadata (duration) for all MediaItems in a playlist?

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When loading/playing a playlist using the new playlist api introduced in 2.12.0, only data for the first item is loaded up until a few seconds before the transition to the next item happens. Window.durationMs from the second item stays C.TIME_UNSET until this point.

While this is perfectly fine for most applications, I do need the duration of all MediaItems in the playlist upon loading.

This leads me to the question if there is any way to configure the loading behaviour of a playlist to include the duration (manifest?) of all items right at the beginning?

[marcbaechinger]

I created a playlist with 4 items. With the default configuration the first two items are prepared initially (the media is quite short that’s why the second item is prepared as well). But then it waits until playback advances to prepare the third and fourth item.

The third item is prepared after about 69 seconds:

timeline [eventTime=69.18, mediaPos=68.14, window=0, period=0, periodCount=4, windowCount=4, reason=SOURCE_UPDATE

When setting useLazyPreparation to false, all media sources are prepared immediately as expected:

mediaItem [eventTime=0.01, mediaPos=0.00, window=0, reason=PLAYLIST_CHANGED]
timeline [eventTime=0.23, mediaPos=0.00, window=0, periodCount=4, windowCount=4, reason=SOURCE_UPDATE
timeline [eventTime=0.24, mediaPos=0.00, window=0, period=0, periodCount=4, windowCount=4, reason=SOURCE_UPDATE
timeline [eventTime=0.28, mediaPos=0.00, window=0, period=0, periodCount=4, windowCount=4, reason=SOURCE_UPDATE
timeline [eventTime=0.77, mediaPos=0.00, window=0, period=0, periodCount=4, windowCount=4, reason=SOURCE_UPDATE
  period [128.27]
  period [135.65]
  period [59.30]
  ...
  window [128.27, true, false]
  window [135.50, true, false]
  window [59.18, true, false]

The logs (printed by EventLogger) show that all four SOURCE_UPDATEs arrived after 0.77 seconds when the media position is still on 0.0. The list of windows in the log is kept at a max of 3 but it shows that the durations are available already.

If you see a different behaviour, can you add the EventLogger to your app and do a bug report when you prepare your player and the upload this here so I can investigate?

[strangesource]

Thanks @marcbaechinger, this helped me out a lot. The workaround propposed in the issue might work for us as well. 👍