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[bug] Codec H264 on Android Screen-share non-functional

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#383 2 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
dart, flutter
Domain
audio-video-rtc, mobile-dev

Research direction

Start by reproducing the issue in the example demo app with H264 selected, Android screen sharing as the publisher, and a remote participant viewing the track; compare with VP8. Then trace the Android screen-share publishing and H264 handling paths to find where remote video stops rendering. Done means remote participants render Android H264 screen-share video, while local rendering continues to work.

Written by the indexing model from the issue text.

Description

Describe the bug
When using H264 with Android screen-share, the local participant will see the video rendered correctly in their local UI viewer. However, other remote participants instead see no video rendered/produced. Remote participants are notified of the new track being publish/subscribed, but the VideoTrackRenderer does not render any video.

VP8 is not impacted by this bug and works as intended.
iOS/Browsers are not impacted by this H264 bug when they are the publisher of screen-sharing.
Other OSs not tested.

To Reproduce
Switch the default codec to H264 within the example demo app. Try to share your screen on Android. I have also independently verified this bug behavior within my own private application.

Expected behavior
Android screen-share video should be rendered by remote participants, and not just the local participant.

Platform information

  • Flutter version:
[√] Flutter (Channel stable, 3.13.5, on Microsoft Windows [Version 10.0.22621.2283], locale en-US)
    • Flutter version 3.13.5 on channel stable at C:\flutter
    • Upstream repository https://github.com/flutter/flutter
    • Framework revision 12fccda598 (3 weeks ago), 2023-09-19 13:56:11 -0700
    • Engine revision bd986c5ed2
    • Dart version 3.1.2
    • DevTools version 2.25.0

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at C:\Users\alden\AppData\Local\Android\sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-b2043.56-10027231)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Build Tools 2019 16.11.29)
    • Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools
    • Visual Studio Build Tools 2019 version 16.11.33927.289
    • Windows 10 SDK version 10.0.19041.0

[√] Android Studio (version 2022.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-b2043.56-10027231)

[√] VS Code (version 1.83.0)
    • VS Code at C:\Users\alden\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.74.0

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22621.2283]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 117.0.5938.150
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 117.0.2045.47

[√] Network resources
    • All expected network resources are available.

• No issues found!
  • Plugin version: ref: main
  • Flutter target OS: `Android (physical Pixel 6 Pro)
  • Flutter target OS version: Android 13
  • Flutter console log: Very long, trust me.

Screenshots
Screenshot_20231010-180918
LiveKit Flutter Example - Google Chrome 10_10_2023 6_09_22 PM

Dominant language
Dart
Stars
421
Forks
260
Avg merge
3d 9h
Merged PRs (30d)
11

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