[BUG] VP8 simulcast causes unexpected downscaling on Chromium at low resolutions #2939
Description
Describe the bug.
When using VP8 with simulcast enabled, the transmitted video resolution is unexpectedly downscaled on Chromium-based browsers if the requested resolution is low (likely below 1280x720). This issue does not occur on Firefox.
Conditions:
- Codec: VP8
- Simulcast: Enabled
- Low resolution input (<1280x720)
- Browser: Chromium-based (Chrome, Edge, etc.)
- Firefox: Not affected
Observed behavior:
| Requested resolution | Actual transmitted resolution |
|---|---|
| 320x240 | 80x60 |
| 640x360 | 320x180 |
| 1280x720 | 1280x720 |
The problem consistently appears on Chromium browsers, while Firefox behaves correctly.
Regression:
The issue started occurring after the following commit (Nov 18, 2023):
70b6843
Expected behavior
The transmitted video resolution should match the requested resolution.
For example:
- 320x240 should remain 320x240.
- 640x360 should remain 640x360.
No additional downscaling should be applied when simulcast is enabled with VP8 at low resolutions.
Screenshots
No response
How to Reproduce
- I first did this
- I then did this
- And so on . . .
🥦 Browser
None
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