[FFmpeg-user] ffv1_vulkan issues

[Owen Quinlan]

> ffmpeg -i input.mp4 -init_hw_device vulkan -c:v ffv1_vulkan output.mkv

Hi there sorry for the late reply!

Using your command also doesn't output any video, running it exactly
results in this:

```
Impossible to convert between the formats supported by the filter
'Parsed_null_0' and the filter 'auto_scale_0'
[vf#0:0 @ 0x585d5a68b680] Error reinitializing filters!
[vf#0:0 @ 0x585d5a68b680] Task finished with error code: -38 (Function not
implemented)
[vf#0:0 @ 0x585d5a68b680] Terminating thread with return code -38 (Function
not implemented)
[vost#0:0/ffv1_vulkan @ 0x585d5a5f0640] [enc:ffv1_vulkan @ 0x585d5a7ea6c0]
Could not open encoder before EOF
[vost#0:0/ffv1_vulkan @ 0x585d5a5f0640] Task finished with error code: -22
(Invalid argument)
[vost#0:0/ffv1_vulkan @ 0x585d5a5f0640] Terminating thread with return code
-22 (Invalid argument)
[out#0/matroska @ 0x585d5a86f140] Nothing was written into output file,
because at least one of its streams received no packets.
```