Letter P appear on the thumbnails

[AraVoskan]

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

[shotcut]

The clip is using a proxy.

[AraVoskan]

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

[MusicalBox]

Proxy Editing

Introduction Proxy editing is the process of creating and using low resolution videos and images in places of the original or optimized (Convert to Edit-friendly) files. This provides the advantage that your computer has less work to do in realtime while editing: decoding, scaling, and effects. This is, quite simply, because there are less pixels to compute. Then, when you are ready to export, it will use the original (or optimized) files for full quality. Performance is optimal when the pre…

[AraVoskan]

@Proxy Editing

Introduction Proxy editing is the process of creating and using low resolution videos and images in places of the original or optimized (Convert to Edit-friendly) files. This provides the advantage that your computer has less work to do in realtime while editing: decoding, scaling, and effects. This is, quite simply, because there are less pixels to compute. Then, when you are ready to export, it will use the original (or optimized) files for full quality. Performance is optimal when the pre…

Thanks for the information provided.