Add Wayland support for --screencast (xdg-desktop-portal + PipeWire + GStreamer)#484

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brycesub:wayland

Commits on Jun 20, 2026

feat(wayland): add session detection and ffmpeg pipewiregrab probe
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feat(stream): allow ffmpeg to inherit fds via pass_fds
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feat(wayland): emit pipewiregrab input for Wayland screencast
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feat(wayland): implement xdg-desktop-portal ScreenCast handshake
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fix(wayland): time out portal handshake instead of hanging forever
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feat(wayland): route --screencast through the portal on Wayland
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harden(wayland): guard portal fd, explicit failure returns, _flask_init tests

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fix(wayland): switch screencast capture from ffmpeg pipewiregrab to GStreamer

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fix(wayland): build portal options as native dicts, not pre-wrapped Variants

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fix(wayland): force 4:2:0/High profile and scale for Chromecast compatibility

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docs(changelog): note Wayland --screencast support

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fix(wayland): make PyGObject import lazy for non-screencast video casts

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fix(cast): wait for media session before issuing play()

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fix(wayland): mint a fresh PipeWire fd per /stream request

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