encoding 1080P videos, for example

```
ffmpeg -vaapi_device /dev/dri/renderD128 -s 1920x1080 -f rawvideo -pix_fmt
rgb24 -r 24 -i /dev/zero -t 1 -pix_fmt yuv420p -vf "format=nv12,hwupload"
-c:v hevc_vaapi -b_depth 2 -async_depth 16 -compression_level 13 -qp 28 -y
 v.mp4
```
or simply
```
ffmpeg -vaapi_device /dev/dri/renderD128 -s 1920x1080 -f rawvideo -pix_fmt
rgb24 -r 24 -i /dev/zero -t 1 -pix_fmt yuv420p -vf "format=nv12,hwupload"
-c:v hevc_vaapi -y  v.mp4
```

will generate a video in 1920x1088, with a green(sometimes noise) bar
under, seemingly 8 pixels high.

hevc_vaapi for Intel GPU, and hevc_nvencfor NVidia GPU has no such issue.

sometimes simpler command generates black padding.

encoding 2160 or 720 video has no such issue
1080 = 8 * 3**3 * 5
2160 = 16 * 3**3 * 5
720 = 16 * 3**2 * 5

workarounds:
- pad video to x1088
- crop video to x1072
- stretch to 1088 and set SAR to 16:9

Control: tags -1 moreinfo

Sorry for the delay. This is not something that the Debian maintainers
can realistically handle. Please take this issue upstream if you can
still reproduce the issue with the current versions of ffmpeg in
unstable. The upstream bug tracker is at
https://code.ffmpeg.org/FFmpeg/FFmpeg/

Cheers