Provide ways to avoid projection for live streams in a playlist

[apptrash]

I'm using HLS event-playlists. There are always two MediaItem's in a playlist. I wish to have seamless transition, but sometimes ExoPlayer doesn't play next item from beginning (it skips around 6-30 seconds and start from this position).

What I do is:

override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
    if (reason == MEDIA_ITEM_TRANSITION_REASON_AUTO) {
        Log.d(TAG, "position: ${player.getCurrentPosition()}") // <-- NOT ZERO !!!
        player.moveMediaItem(1, 0)
        player.removeMediaItem(1)
        player.addMediaItem(nextMediaItem)
    }
}

Can you help me? Am i doing something wrong?

All of HLS playlists looks the same:

#EXTM3U
#EXT-X-TARGETDURATION:10
#EXT-X-VERSION:3
#EXT-X-START:TIME-OFFSET=0
#EXT-X-MEDIA-SEQUENCE:26992
#EXT-X-PLAYLIST-TYPE:EVENT
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T15:34:53.706Z
2021-06-09/15/segment_153453706_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T15:35:03.960Z
2021-06-09/15/segment_153503960_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T15:35:13.953Z
2021-06-09/15/segment_153513953_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T15:35:23.654Z
2021-06-09/15/segment_153523654_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T15:35:34.034Z
2021-06-09/15/segment_153534034_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T15:35:44.006Z
2021-06-09/15/segment_153544006_010080.ts
...
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T16:26:17.988Z
2021-06-09/16/segment_162617988_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T16:26:28.364Z
2021-06-09/16/segment_162628364_010080.ts
#EXTINF:10.08000
#EXT-X-PROGRAM-DATE-TIME:2021-06-09T16:26:38.226Z
2021-06-09/16/segment_162638226_010080.ts

ExoPlayer version r2.14.0

[claincly]

Not sure if I understand, if your playlist contains two media items, ExoPlayer will handle the transition for you, you don't have to manually do transition.

[apptrash]

override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
    if (reason == MEDIA_ITEM_TRANSITION_REASON_AUTO) {
        Log.d(TAG, "position: ${player.getCurrentPosition()}") // <-- NOT ZERO !!!
        player.addMediaItem(nextMediaItem)
    }
}

I deleted unnecessary lines player.moveMediaItem(1, 0) / player.removeMediaItem(1)
And it doesn't change anything. After transition new item position still != 0

[apptrash]

I'm adding new item when current item is ended (this is just a logic of an app). Maybe I should do it in some other place/callback?

[apptrash]

As you can see Log.d() print position before player.addMediaItem(nextMediaItem). So I think that it's not a reason.

[apptrash]

mediaItem [eventTime=218.51, mediaPos=28.52, window=1, period=1, reason=AUTO]
positionDiscontinuity [eventTime=218.51, mediaPos=28.52, window=1, period=1, reason=AUTO_TRANSITION, PositionInfo:old [window=0, period=0, pos=907200], PositionInfo:new [window=1, period=1, pos=28399]]

There are a couple of logs from 'EventLogger': as you can see mediaPos=28.52 and reason=AUTO_TRANSITION

[apptrash]

I've also notice next log on transition:

droppedFrames [eventTime=64.83, mediaPos=30.24, window=1, period=1, 2]

[apptrash]

I've created sample application to reproduce this issue: https://github.com/apptrash/ExoBugSandbox

[apptrash]

I do think that it's a bug rather than question

[apptrash]

@claincly can you help me with this issue?