[TF2] Replace QuickTime 7 with Open-Source software for Replay Editor

[Wadmodder]

Ever since the Replay Update for Team Fortress 2 was released in 2011, players are able to create their own replays in the Replay Editor, but at the cost of requiring QuickTime Player version 7 on Windows and macOS versions prior to Catalina. Since Apple discontinued development of QuickTime Player version 7 for Windows and macOS in 2016 for the former and 2019 for the latter. Also, Apple never released a version of QuickTime Player for Linux, rendering the Replay Editor useless on that platform.

Would it be possible for Valve to replace QuickTime Player with any of the following Open-Source software which are as follows:

• LosslessCut
• Avidemux
• Cinelerra
• Kdenlive
• Natron
• Flowblade
• LiVES
• OpenShot
• Shotcut
• Pitivi
• MPlayer
• SMPlayer
• Kodi
• xine
• GNOME Videos
• VLC
• mpv
• Media Player Classic Home Cinema
• sView
• FFplay/FFMPEG
• Apprentice Video

All this software have more stable APIs, includes more features, and have better active development than QuickTime Player version 7.

I've doubt that Valve would ever replace the QuickTime Player with Open-Source software for TF2's Replay Editor feature.

[Delfite]

I like it when TF2 video creators use the replay system to make cool videos, so making the process of editing those replay files much easier would benefit everyone greatly, hope this gets fixed eventually.

[Ashetf2]

Since BIK has been replaced with WEBM, hopefully quicktime will be replaced too

[Platina6978]

Also worth it to keep https://github.com/ValveSoftware/Source-1-Games/issues/5511 in mind when it comes to considering to replace QuickTime 7.