Letter P appear on the thumbnails

Why does the letter P appear on the thumbnails in the ShotCut editor?
And on the quest log, this is:

ffmpeg version n6.1.1-16-g33efa50fa4 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
  configuration: --prefix=/d/a/shotcut/shotcut/build/Shotcut --disable-static --disable-doc --enable-gpl --enable-version3 --enable-shared --enable-runtime-cpudetect --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libvpx --enable-libopus --enable-libvpl --enable-libdav1d --enable-libaom --disable-decoder=libaom_av1 --enable-libwebp --disable-vulkan --disable-vaapi --enable-libzimg --enable-libvmaf --disable-w32threads

The clip is using a proxy.

Why do you need a proxy?
How can I make it not exist?

Thanks for the information provided.

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