# 3 headless player listener issues: when playing MP4 in Shaka Player in one case; onEnded Called Twice, Position updates reports 0 **URL:** \ **Category:** Bug Reports\ **Created:** [September 29, 2025, 2:03pm UTC](https://community.amazondeveloper.com/t/3-headless-player-listener-issues-when-playing-mp4-in-shaka-player-in-one-case-onended-called-twice-position-updates-reports-0/20442 "2025-09-29T14:03:20Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![MatthewThies](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/matthewthies/32/134_2.png) [@MatthewThies](https://community.amazondeveloper.com/u/MatthewThies)\ **Post date:** [September 29, 2025, 2:03pm UTC](https://community.amazondeveloper.com/t/3-headless-player-listener-issues-when-playing-mp4-in-shaka-player-in-one-case-onended-called-twice-position-updates-reports-0/20442/1 "2025-09-29T14:03:21Z")
* * * # 👉 Bug Description * * * ## 1. Summary 3 headless player listener issues: when playing MP4 in Shaka Player in one case; onEnded Called Twice, Position updates reports 0 **App Name** : [starz.com](http://starz.com) **App Link on Amazon Appstore** (found through Developer Console → Actions column in App List → View on [Amazon.com](http://Amazon.com)): ## 2. Observed Behavior _Explain what actually happened, noting any discrepancies or malfunctions._ ```auto * When using Shaka Player and playing MP4 we do not get a duration update until a seek is performed by the user * onEnded occurs twice at the end of any media played (be it MP4 or DASH-DRM-PROTECTED for us). * position does not report correctly just after a seek and sometimes reports 0 incorrectly ``` ## 3. Environment _Please fill out the fields related to your bug below:_ - **SDK Version:** 0.20.3719 - **App State:** Foregorund - **OS Information** NAME=“OS” * * * This post was requested by our Amazon contact whom I will be sharing vpkg/build directory + relevant logs and video demonstrating these issues. * * * ---
**Author:** ![Ivy](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/ivy/32/5637_2.png) [@Ivy](https://community.amazondeveloper.com/u/Ivy)\ **Post date:** [September 30, 2025, 8:30am UTC](https://community.amazondeveloper.com/t/3-headless-player-listener-issues-when-playing-mp4-in-shaka-player-in-one-case-onended-called-twice-position-updates-reports-0/20442/3 "2025-09-30T08:30:55Z")
Hi @MatthewThies Thanks for reporting this issue. Please share the VPKG files via your Amazon contacts, that will allow us to look into this further. Warm regards, Ivy ---
**Author:** ![Ivy](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/ivy/32/5637_2.png) [@Ivy](https://community.amazondeveloper.com/u/Ivy)\ **Post date:** [October 9, 2025, 9:47am UTC](https://community.amazondeveloper.com/t/3-headless-player-listener-issues-when-playing-mp4-in-shaka-player-in-one-case-onended-called-twice-position-updates-reports-0/20442/4 "2025-10-09T09:47:26Z")
Hi @MatthewThies Can you please share the steps to reproduce the issues? Also, please share the logs if possible. Warm regards, Ivy ---
**Author:** ![Ivy](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/ivy/32/5637_2.png) [@Ivy](https://community.amazondeveloper.com/u/Ivy)\ **Post date:** [November 27, 2025, 8:41am UTC](https://community.amazondeveloper.com/t/3-headless-player-listener-issues-when-playing-mp4-in-shaka-player-in-one-case-onended-called-twice-position-updates-reports-0/20442/5 "2025-11-27T08:41:15Z")
Closing this topic due to inactivity. ---
**Author:** ![Ivy](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/ivy/32/5637_2.png) [@Ivy](https://community.amazondeveloper.com/u/Ivy)\ **Post date:** [November 27, 2025, 8:41am UTC](https://community.amazondeveloper.com/t/3-headless-player-listener-issues-when-playing-mp4-in-shaka-player-in-one-case-onended-called-twice-position-updates-reports-0/20442/6 "2025-11-27T08:41:28Z")