Allow seamless switching between different audio tracks (e.g. in MKV)

[minhjirachi]

Hi

I have test the demo application with the local file with multiple audio in the MKV container. The problem I get stuck is the Exoplayer switching audio. It causes 2 or 3 seconds to change to another audio track. So is there anyway to fix this problem?

And with each video, I want it play the seconds track as default. So which class I need to customize for meet that requirement?

Thank you.

[minhjirachi]

I have tested on the android box and playing the video via Wifi connection. When switching audio, it cause about 5 - 6 seconds. If I connect it via LAN connection, it cause about 2 - 3 seconds to switching audio.

If I seperate the original .mkv video file into 2 files: .mkv (video only) and .mka (audio only). Then the switching function happened is pretty fast. But it can not synchronized to the video.

[minhjirachi]

I have tested on the previous version v1.5.16. Switching audio is very fast. But I don't know why on this version, switching audio so ***. Till now I really need a helping hand.

[ojw28]

There is a trade-off between memory consumption and switching speed. In V1 we buffered all tracks in memory and so could switch to them quickly (although the implementation is technically not quite right). In V2 we buffer only the tracks that are enabled, which saves memory but results in slower switching.

This was done intentionally, although we are revisiting this decision currently. It could be that we revert back to how we did things in V1, although in a technically correct way.

[minhjirachi]

Thank you for your answer.

In V1, switching audio function is pretty good (comparing with V2). But it does not have the FFMPEG Audio Decoder. LibVP9 is not work too. I have to modified some classes. Some functions on the V2 do not exist on the old onces. But in V2, both libs work like a charm. But switching audio is not really good as V1.

Memory of android devices were rised up day by day. So please bring it back on next version of Exoplayer.

Thank you.

[ojw28]

Memory of android devices were rised up day by day.

Citation needed (particularly for low end Android devices) ;).

[ojw28]

We're going to revert back to allowing seamless switching between multiple audio tracks. It's still incorrect to state that memory of Android devices is increasing much, however, particularly at the low end.

[ojw28]

This is fixed in dev-v2.

[minhjirachi]

Thank you so much. I have waited this good news for a long time.