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main_window: skip embedded preview stop() when popout is open

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behavior change: _on_video_stream no longer calls stop() on the
embedded preview's mpv when the popout is the visible target. The
embedded preview is hidden and idle — the synchronous command('stop')
round-trip was wasting ~50-100ms on the click-to-first-frame critical
path with no visible benefit. loadfile("replace") in the popout's
play_file handles the media swap atomically.
This commit is contained in:
pax 2026-04-09 20:51:06 -05:00
parent 82e7c77251
commit 510b423327
1 changed files with 12 additions and 8 deletions
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20
booru_viewer/gui/main_window.py
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@ -1461,21 +1461,25 @@ class BooruApp(QMainWindow):
flag in that closure so it doesn't re-call set_media with
the local path mid-playback (which would interrupt mpv and
reset position to 0).
When the popout is open, the embedded preview's mpv is not
stopped — it's hidden and idle, and the synchronous stop()
call would waste critical-path time for no visible benefit.
"""
# Stop any video player currently active in the embedded
# preview before swapping it out — mirrors the close-old-mpv
# discipline of `_update_fullscreen`.
self._preview._video_player.stop()
if self._fullscreen_window and self._fullscreen_window.isVisible():
# Popout open — only stream there, keep embedded preview clear.
# Popout is the visible target — leave the embedded preview's
# mpv alone. It's hidden and idle; stopping it here wastes
# synchronous time on the critical path (command('stop') is a
# round-trip into mpv's command queue). loadfile("replace") in
# the popout's play_file handles the media swap atomically.
self._preview._info_label.setText(info)
self._preview._current_path = url
self._fullscreen_window.set_media(url, info, width=width, height=height)
self._update_fullscreen_state()
else:
# Embedded preview's set_media doesn't take width/height
# (it's in a docked panel and doesn't fit-to-content) so
# the pre-fit hint goes nowhere here. Just hand it the URL.
# Embedded preview is the visible target — stop any active
# playback before handing it the new URL.
self._preview._video_player.stop()
self._preview.set_media(url, info)
self._status.showMessage(f"Streaming #{Path(url.split('?')[0]).name}...")
# Note: no `_update_fullscreen_state()` call when popout is