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fix(call): do not downscale screenshare on Firefox#18747

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fix/2199/firefox-munge-sdp
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fix(call): do not downscale screenshare on Firefox#18747
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fix/2199/firefox-munge-sdp

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@Antreesy Antreesy commented Jul 22, 2026

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☑️ Resolves

  • Ref Screen share quality 3440x1440 (UW-QHD) #2199 ; was noticed while closing:
  • Firefox defaults the VP8/VP9 "max-fs" to ~QHD (~2560×1440 px):
    a=fmtp:120 max-fs=12288;max-fr=60
  • Raising it lets Firefox encode up to 4K (3840×2160 px):
    a=fmtp:120 max-fs=36864;max-fr=60

AI (if applicable)

  • The content of this PR was partly or fully generated using AI

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🏚️ Before 🏡 After
2026-07-22_12h57_43 2026-07-22_12h53_37
2026-07-22_13h02_09 2026-07-22_13h00_18

🏁 Checklist

  • 🌏 Tested with different browsers / clients:
    • Chromium (Chrome / Edge / Opera / Brave)
    • Firefox
    • Safari
    • Talk Desktop
    • Integrations with Files sidebar and other apps
    • Not risky to browser differences / client
  • 🖌️ Design was reviewed, approved or inspired by the design team
  • ⛑️ Tests are included or not possible
  • 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

@Antreesy
fix(call): do not downscale screenshare on Firefox
f3de5e5 
- Firefox defaults the VP8/VP9 "max-fs" to ~QHD (~2560×1440 px):
- a=fmtp:120 max-fs=12288;max-fr=60
- Raising it lets Firefox encode up to 4K (3840×2160 px):
- a=fmtp:120 max-fs=36864;max-fr=60

Assisted-by: ClaudeCode:claude-opus-4-8
Signed-off-by: Maksim Sukharev <antreesy.web@gmail.com>
@Antreesy Antreesy added this to the ⛅ Next Major (35) milestone Jul 22, 2026
@Antreesy
Antreesy requested a review from danxuliu July 22, 2026 12:58
@Antreesy Antreesy self-assigned this Jul 22, 2026
@Antreesy Antreesy added bug feature: frontend 🖌️ "Web UI" client feature: call 📹 Voice and video calls AI assisted This PR contains AI-assisted commits labels Jul 22, 2026
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