When the Android client uses H264 encoding, the video resolution is lower than the published resolution, causing a green screen problem.

[boolw]

Describe the bug
When making a video call using LiveKit Example.apk, set the video encoding to H264 and the publishing resolution to 720x1280. When the actual video resolution is lower than this value, a green screen phenomenon will appear at the bottom part of the video.

Server

• livekit-server version 1.6.0

Client

• LiveKit Example
• Android

Steps to reproduce

1. Open LiveKit Example.
2. Set the video encoding to H264 and the publishing resolution to 720x1280.
3. Publish a video stream with an actual resolution lower than 720x1280.
4. Observe the video display on the receiving end.

Expected behavior
The video should display normally regardless of whether the actual resolution is lower than the set publishing resolution.

actual behavior
When the actual resolution of the video is lower than 720x1280, a green screen appears on the bottom part of the video.

Screenshots

[cnderrauber]

Did you enable simulcast? The server will not touch video data if simulcast is disabled, you can check the encoding frame is correct when publisher encoder scales down the resolution, or the subscriber render frame has issue.

[boolw]

I just tried it. There is a green screen when simulcast is turned on or off. I adjusted the resolution from 1280720 to 640480 and the green screen still appears. The phone with the problem is: HONOR 9x

[cnderrauber]

It sounds like a device encoder issue, are you using hardware encoder or software?