特定格式视频缩略图无法通过ffmpeg生成

[qdljerry]

Describe the bug
在配置好ffmpeg环境中加载mkv格式的视频缩略图时出现错误

To Reproduce

1. 生成mkv格式视频缩略图

Log

[0.51ms]  UPDATE "files" SET "metadata" = '{"thumb_status":"not_available"}'  WHERE "files"."deleted_at" IS NULL AND "files"."id" = 425
[1 rows affected or returned ]
enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      58. 13.101 / 58. 13.101
  libavcodec     60. 21.100 / 60. 21.100
  libavformat    60.  9.100 / 60.  9.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  8.102 /  9.  8.102
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
[in#0 @ 00000283e95ba140] Unknown input format: 'mkv'

[Warning] 2023-07-02 16:42:01 Failed to invoke ffmpeg: ffmpeg version 2023-06-27-git-9b6d191a66-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers

Desktop (please complete the following information):

• OS: Windows11
• Browser: Edge

Additional context
In pkg/thumb/ffmpeg.go line 71

	cmd := exec.CommandContext(ctx,
		ffmpegOpts["thumb_ffmpeg_path"], "-ss", ffmpegOpts["thumb_ffmpeg_seek"], "-f", inputFormat, "-i", tempInputPath,
		"-vf", scaleOpt, "-vframes", "1", tempOutputPath)

We can see that a -f option is added to ffmpeg which caused this error, however, this option is not necessary.
Is it possible to remove the the -f option?