Error running ffmpeg, output is: on Arch Linux about superview HOT 3 CLOSED

ffmpeg version: 4.1.6-1~deb10u1
Hardware accelerators: vdpau,vaapi,drm
H.264 encoders: libx264,libx264rgb,h264_omx,h264_v4l2m2m,h264_vaapi
H.265/HEVC encoders: libx265,hevc_v4l2m2m,hevc_vaapi
Scaling input file /convert/output/DJIG0001_stabilized.mp4 (codec: h264, duration: 19 secs) from 960*720 to 1280*720 using superview scaling. Squeeze: false
Filter files generated
Re-encoding video with h264_vaapi encoder at 29 MB/s bitrate
2020/08/07 21:14:16 Error running ffmpeg, output is:
&{%!s(*os.file=&{{{1 0 0} -1 {0} <nil> 0 0 true true true} |0 <nil> true false false})}