# Mp3 doesn't start playing until is fully downloaded **URL:** \ **Category:** Bug Reports\ **Tags:** vega-media-player\ **Created:** [September 16, 2025, 9:46am UTC](https://community.amazondeveloper.com/t/mp3-doesnt-start-playing-until-is-fully-downloaded/20326 "2025-09-16T09:46:37Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![David\_Mitjana\_Castro](https://avatars.discourse-cdn.com/v4/letter/d/aca169/32.png) [@David\_Mitjana\_Castro](https://community.amazondeveloper.com/u/David_Mitjana_Castro)\ **Post date:** [September 16, 2025, 9:46am UTC](https://community.amazondeveloper.com/t/mp3-doesnt-start-playing-until-is-fully-downloaded/20326/1 "2025-09-16T09:46:37Z")
# 👉 Bug Description * * * ## 1. Summary We have some very large mp3 files of \>3MB and \>60mins long, and they don’t start playing until the whole mp3 is fully downloaded, and this can take 15s-20s. **Bug Severity** Select one that applies - Impacts operation of app - Blocks current development - Improvement suggestion - Issue with documentation (If selected, please share the doc link and describe the issue) - Other ## 2. Steps to Reproduce - Play a large mp3 content (3MB-4MB / ~60mins long) using Kepler’s native `AudioPlayer` component (we can provide the large mp3 if required) - Playback starts after 15s-20s. ## 3. Observed Behavior It takes 15s-20s to start playing - more or less the same time it takes to download the full mp3. We see a big gap (~15s) between the first `durationchange` event and the `loadstart` event. ## 4. Expected Behavior Playback starts almost immediately while the mp3 is being downloaded. ### 4.a Possible Root Cause & Temporary Workaround Looks like the mp3 doesn’t start playing until it’s fully downloaded. ## 5. Logs or crash report We can provide if needed, but this is also reproducible in the Kepler Video sample app. ## 6. Environment _Please fill out the fields related to your bug below:_ - **SDK Version:** _Output of `kepler --version`_ - **App State:** `[Foreground/Background]` - **OS Information** Please ssh into the device via `kepler exec vda shell`and copy the output from `cat /etc/os-release`into the answer section below. _Note, if you don’t have a simulator running or device attached `kepler exec vda shell` will respond with `vda: no devices/emulators found`_ * * * ## 👉 Playback Issues * * * ```auto We have some very large mp3 files of >3MB and >60mins long, and they don’t start playing until the whole mp3 is fully downloaded, and this can take 15s-20s. ``` Please share the following details in addition:\_ - **Player SDK:** `N/A` - **Player SDK Version:** `N/A` - **Audio Codecs:** `N/A` - **Video Codecs:** `N/A` - **Manifest Types:** `N/A` **Q: Would you like to be contacted to share your latest VPKG compiled with latest SDK:** ```auto [Y/N] [Share privately with your Amazon contact] ``` **Q: VPN or Login needed to verify functionality in VPKG?** ```auto [Y/N] [Share privately with your Amazon contact] ``` **Q: If applicable, please provide your media/content url** _If this is created dynamically, tokenized, etc please provide a way for us to access it_ ```auto [N/A or Content / Media Url for testing] [Share privately with your Amazon contact] ``` **Q: Are there any special headers required to reproduce the issue you are facing?** ```auto [N/A or Insert Headers] ``` **Additionally please provide the following if possible** _Provide Screenshots / Screengrabs / Logs. Please include as much information as you can that will help debug._ ```auto ``` * * * ## 👉 Additional Context * * * **Any Additional Context you would like to provide?** _Add any other relevant information, such as recent updates to the SDK, dependencies, or device OS that may affect the bug._ ```auto ``` ---
**Author:** ![Amz\_Rsk](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/amz_rsk/32/499_2.png) [@Amz\_Rsk](https://community.amazondeveloper.com/u/Amz_Rsk)\ **Post date:** [September 16, 2025, 5:57pm UTC](https://community.amazondeveloper.com/t/mp3-doesnt-start-playing-until-is-fully-downloaded/20326/3 "2025-09-16T17:57:02Z")
Hi @David_Mitjana_Castro , This has been reported to out internal team. Thanks, Rohit ---
**Author:** ![Amz\_Rsk](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/amz_rsk/32/499_2.png) [@Amz\_Rsk](https://community.amazondeveloper.com/u/Amz_Rsk)\ **Post date:** [September 18, 2025, 6:13pm UTC](https://community.amazondeveloper.com/t/mp3-doesnt-start-playing-until-is-fully-downloaded/20326/4 "2025-09-18T18:13:20Z")
Hi @David_Mitjana_Castro , Our team is trying to reproduce the issue, can you please share the below information with us? 1. Is it happening only with this content? or for other contents as well. 2. Could you please share the app vpkg with your Amazon POC.? Thanks, Rohit ---
**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:** [December 4, 2025, 11:40am UTC](https://community.amazondeveloper.com/t/mp3-doesnt-start-playing-until-is-fully-downloaded/20326/5 "2025-12-04T11:40:21Z")
Closing topic due to inactivity. @David_Mitjana_Castro if you are still facing this issue, please create a new topic. Happy to help! ---
**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:** [December 4, 2025, 11:40am UTC](https://community.amazondeveloper.com/t/mp3-doesnt-start-playing-until-is-fully-downloaded/20326/6 "2025-12-04T11:40:24Z")