[Bug 282862] Recoding a video using multimedia/ffmpeg + vaapi creates too large files

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282862

            Bug ID: 282862
           Summary: Recoding a video using multimedia/ffmpeg + vaapi
                    creates too large files
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: multimedia@FreeBSD.org
          Reporter: shamaz.mazum@gmail.com
             Flags: maintainer-feedback?(multimedia@FreeBSD.org)
          Assignee: multimedia@FreeBSD.org

Hi. When recoding a video with GPU acceleration, an output has too big size
despite quality settings (about 1 GB per minute), but the video itself is OK.
How to reproduce (be sure not to run to completion!):

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128
-hwaccel_output_format -i input.mp4 -c:a copy -c:v hevc_vaapi -qp 20 output.mp4

hevc_vaapi can be replaced with h264_vaapi as well.

System info:
FreeBSD 14.1-RELEASE-p6
sway 1.10
ffmpeg 6.1.2_5,1
mesa-dri/-libs/-gallium-va 24.1.7
libva(-utils) 2.22.0

Video card:
AMD Radeon RX 6600 XT
drm-61-kmod 6.1.92_2
gpu-firmware-amd-kmod-dimgrey-cavefish 20230625_2

vainfo output:
vasily@vonbraun:~ % vainfo
Trying display: wayland
libva info: VA-API version 1.22.0
libva info: Trying to open /usr/local/lib/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_22
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.22 (libva 2.22.0)
vainfo: Driver version: Mesa Gallium driver 24.1.7 for AMD Radeon RX 6600 XT
(radeonsi, navi23, LLVM 15.0.7, DRM 3.49, 14.1-RELEASE-p6)
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileVC1Simple              : VAEntrypointVLD
      VAProfileVC1Main                : VAEntrypointVLD
      VAProfileVC1Advanced            : VAEntrypointVLD
      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
      VAProfileNone                   : VAEntrypointVideoProc

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