Your system information

• Steam client version (build number or date): it says "Steamバージョン: 1738026274"
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes, I checked and update every package and reboot, but issue still persist
• Steam Logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]
• GPU: AMD Radeon 780M (iGPU on Ryzen 9 7940HS)

$ /usr/bin/vainfo
Trying display: wayland
vainfo: VA-API version: 1.22 (libva 2.22.0)
vainfo: Driver version: Mesa Gallium driver 24.3.4-arch1.1 for AMD Radeon 780M (radeonsi, gfx1103_r1, LLVM 19.1.7, DRM 3.59, 6.12.13-1-lts)
vainfo: Supported profile and entrypoints
      VAProfileH264ConstrainedBaseline: VAEntrypointVLD
      VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
      VAProfileH264Main               : VAEntrypointVLD
      VAProfileH264Main               : VAEntrypointEncSlice
      VAProfileH264High               : VAEntrypointVLD
      VAProfileH264High               : VAEntrypointEncSlice
      VAProfileHEVCMain               : VAEntrypointVLD
      VAProfileHEVCMain               : VAEntrypointEncSlice
      VAProfileHEVCMain10             : VAEntrypointVLD
      VAProfileHEVCMain10             : VAEntrypointEncSlice
      VAProfileJPEGBaseline           : VAEntrypointVLD
      VAProfileVP9Profile0            : VAEntrypointVLD
      VAProfileVP9Profile2            : VAEntrypointVLD
      VAProfileAV1Profile0            : VAEntrypointVLD
      VAProfileAV1Profile0            : VAEntrypointEncSlice
      VAProfileNone                   : VAEntrypointVideoProc

Please describe your issue in as much detail as possible:

I tried to export my clip, but none of them are worked:

• Export as video file, using original ("オリジナル") option
• Export as video file, using file size ("ファイルサイズ") option
• Export as video file, using custom ("カスタム") option, while choosing H.265 (HEVC) codec option
  • none of them are worked if codec is H.265:
    • reduce resolution to 720p (from 1080p)
    • reduce frame rate to 30 (from 60)
    • try every bitrate option (including original)
  • but I can export clip if I choose H.264 as a codec
• Copy to clipboard
• Send to my smartphone
• Create Share Link

Note, I could send clip to other PC (but currently my other Windows/Linux machine is not accessible, so I couldn't verify actually clip was sended. but Steam says successfully sent it)

Tried games:

• Shiren the Wanderer https://store.steampowered.com/app/2178480
• Tetris Effect: Connected https://store.steampowered.com/app/1003590

both games are running on Proton 9.0.

console log only shows this:

Starting export of clip clip_2178480_20250209_130052
Exporting/previewing from MPD files /home/user/.local/share/Steam/userdata/347074001/gamerecordings/clips/clip_2178480_20250209_130052/video/bg_2178480_20250209_123922/session.mpd
[export] Starting for file: /home/user/Videos/不思議のダンジョン　風来のシレン６　とぐろ島探検録 - 2025-02-09 22-00-47 (2).mp4
[export] Failed to make initial encoder
Export failed with error code Failure

Steps for reproducing this issue:

1. Enable Steam Game Recording
2. (Maybe Enable H.265/HEVC codec is required, for my case i think its enabled by default)
3. Play some game and create clip from overlay
4. Try to export it