Abnormal behavior in playback speed in iOS devices

[Ravi-79]

Have you read the FAQ and checked for duplicate open issues?
I tried, but I couldn't find any.

If the problem is related to FairPlay, have you read the tutorial?

No, It's not.

What version of Shaka Player are you using?

I found it on 4.12.5 and also able to repro in 4.12.7(Uncompiled) .

Can you reproduce the issue with our latest release version?
Yes

Can you reproduce the issue with the latest code from main?
I haven't tried that.

Are you using the demo app or your own custom app?
Custom app

If custom app, can you reproduce the issue using our demo app?
Yes.

What browser and OS are you using?
iOS 18.2
Safari

For embedded devices (smart TVs, etc.), what model and firmware version are you using?
NA

What are the manifest and license server URIs?

I am using shaka demo content only.
https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;assetBase64=eyJuYW1lIjoiTGl2ZSBzaW0gKDJzIHNlZ21lbnRzKSIsInNob3J0TmFtZSI6IiIsImljb25VcmkiOiJodHRwczovL3N0b3JhZ2UuZ29vZ2xlYXBpcy5jb20vc2hha2EtYXNzZXQtaWNvbnMvZGFzaF9pZl90ZXN0X3BhdHRlcm4ucG5nIiwibWFuaWZlc3RVcmkiOiJodHRwczovL2xpdmVzaW0yLmRhc2hpZi5vcmcvbGl2ZXNpbTIvdXRjX2hlYWQvdGVzdHBpY18ycy9NYW5pZmVzdC5tcGQiLCJzb3VyY2UiOiJEQVNILUlGIiwiZm9jdXMiOmZhbHNlLCJkaXNhYmxlZCI6ZmFsc2UsImV4dHJhVGV4dCI6W10sImV4dHJhVGh1bWJuYWlsIjpbXSwiZXh0cmFDaGFwdGVyIjpbXSwiY2VydGlmaWNhdGVVcmkiOm51bGwsImRlc2NyaXB0aW9uIjpudWxsLCJpc0ZlYXR1cmVkIjpmYWxzZSwiZHJtIjpbIk5vIERSTSBwcm90ZWN0aW9uIl0sImZlYXR1cmVzIjpbIkRBU0giLCJMaXZlIiwiTVA0Il0sImxpY2Vuc2VTZXJ2ZXJzIjp7Il9fdHlwZV9fIjoibWFwIn0sIm9mZmxpbmVMaWNlbnNlU2VydmVycyI6eyJfX3R5cGVfXyI6Im1hcCJ9LCJsaWNlbnNlUmVxdWVzdEhlYWRlcnMiOnsiX190eXBlX18iOiJtYXAifSwicmVxdWVzdEZpbHRlciI6bnVsbCwicmVzcG9uc2VGaWx0ZXIiOm51bGwsImNsZWFyS2V5cyI6eyJfX3R5cGVfXyI6Im1hcCJ9LCJleHRyYUNvbmZpZyI6bnVsbCwiZXh0cmFVaUNvbmZpZyI6bnVsbCwiYWRUYWdVcmkiOm51bGwsImltYVZpZGVvSWQiOm51bGwsImltYUFzc2V0S2V5IjpudWxsLCJpbWFDb250ZW50U3JjSWQiOm51bGwsImltYU1hbmlmZXN0VHlwZSI6bnVsbCwibWVkaWFUYWlsb3JVcmwiOm51bGwsIm1lZGlhVGFpbG9yQWRzUGFyYW1zIjpudWxsLCJ1c2VJTUEiOnRydWUsIm1pbWVUeXBlIjpudWxsfQ==;panel=ALL_CONTENT;panelData=LIVE;build=uncompiled

What configuration are you using? What is the output of player.getNonDefaultConfiguration()?

{preferredAudioLanguage: "en-US", preferredTextLanguage: "en-US"}

What did you do?

Step 1: Open any Live player in Shaka demo content in iOS device. Preferably iOS 18 and above. (https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;assetBase64=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;panel=ALL_CONTENT;panelData=LIVE;build=uncompiled)
Step 2: Keep the player behind the live for at least 30 seconds to start testing the playback speed.
Step 3: Make sure the the current playback speed is 1x and enter into Fullscreen mode which will open the Native player.
Step 4: Change the playback speed to 2x from the native player controls and exit the Fullscreen mode. Now the player is again in the inline player mode with the changed playback speed rate at 2x.
Step 5: Pause the video for few seconds and make sure the video is still in the 2x. Then click the play and click the 1x button from playback speed menu, this will automatically select the 2x itself even though the 1x is being pressed.(Happened in 4.12.5 and sometimes in 4.12.7 as well.)
Step 6: If it's not happening like I mentioned in the step 5 skip the step 5 and after coming back from Fullscreen keep the video in 2x as it's selected in native player and make sure the video is behind live edge and click the negative timer (shaka Timer control) from bottom controls to go to the live edge. This should automatically change the playback speed to 1x and the video should be live as well. But the playback is still at 2x and also clicking the 1x will automatically select 2x.(Constantly reproable in v4.12.7)
What did you expect to happen?
The player should not have weird playback speed controls when coming back from iOS native player.
The playback speed options should be selectable based on the timeline we're in the live edge.

What actually happened?

I think when the player comes back from Fullscreen mode aka native iOS player, it considers the recent playback speed (2x) from native player as default playback speed. So whenever I tried to click the previous default playback speed from Shaka (1x), It automatically selects the new default (2x). As I mentioned this can be reproable up to v4.12.5. But in latest version the similar process which is clicking the Current Time control to go live edge is also doing same behavior.

iOS_playback_speed_issue.mp4

Are you planning to send a PR to fix it?
No, I am expecting some expert help on this.

[tykus160]

I've tried to reproduce it on Mac Safari but it seems it doesn't have native rate controls for live.

[avelad]

I've reproduced the issue described here, but I think it's a buggy behavior of Safari. When you change the playback rate in full screen, they internally change defaultPlaybackRate as well, so if it was initially 1, and you now choose 2, that value is now 2, when it shouldn't have changed.

[shaka-bot]

Closing due to inactivity. If this is still an issue for you or if you have further questions, the OP can ask shaka-bot to reopen it by including @shaka-bot reopen in a comment.

[Ravi-79]

I've reproduced the issue described here, but I think it's a buggy behavior of Safari. When you change the playback rate in full screen, they internally change defaultPlaybackRate as well, so if it was initially 1, and you now choose 2, that value is now 2, when it shouldn't have changed.

So, just want to confirm, there is nothing we can do it from Shaka player side or is it will be resolved in upcoming releases?
@avelad