[FFmpeg-trac] #10492(undetermined:new): scale_vt does not seems to work correctly

[FFmpeg]

#10492: scale_vt does not seems to work correctly
-------------------------------------+-------------------------------------
             Reporter:  Paul         |                    Owner:  (none)
  Pacifico                           |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by Paul Pacifico:

Old description:

> I've just compiled the latest git version of FFmpeg to use the
> ''scale_vt'' filter.
>

> **When using:**
>
> {{{
> ffmpeg -hwaccel videotoolbox -hwaccel_output_format videotoolbox_vld -i
> input.mov -c:v hevc_videotoolbox -b:v 5M
> -vf scale_vt=640:360 -an -tag:v hvc1 ouput.mp4
> }}}
>
> It does not scale the output.
>

> **But if I add hwdownload,format=nv12:**
>
> {{{
> ffmpeg -hwaccel videotoolbox -hwaccel_output_format videotoolbox_vld -i
> input.mov -c:v hevc_videotoolbox -b:v 5M
> -vf scale_vt=640:360,hwdownload,format=nv12 -an -tag:v hvc1 ouput.mp4
> }}}
>
> The image is cropped to a 640x360 scale.
>
> I've tried using various input file (8bit or 10bit) same result.
>
> Tested on a Mac Mini M1.
>
> Paul.

New description:

 I've just compiled the latest git version of FFmpeg to use the
 ''scale_vt'' filter.


 **When using:**

 {{{
 ffmpeg -hwaccel videotoolbox -hwaccel_output_format videotoolbox_vld -i
 input.mov -c:v hevc_videotoolbox -b:v 5M
 -vf scale_vt=640:360 -an -tag:v hvc1 ouput.mp4
 }}}

 It does not scale the output.


 **But if I add hwdownload,format=nv12:**

 {{{
 ffmpeg -hwaccel videotoolbox -hwaccel_output_format videotoolbox_vld -i
 input.mov -c:v hevc_videotoolbox -b:v 5M
 -vf scale_vt=640:360,hwdownload,format=nv12 -an -tag:v hvc1 ouput.mp4
 }}}

 The image is cropped to a 640x360 scale.

 I've tried using various input files (8bit or 10bit) same result.

 Tested on a Mac Mini M1.

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Ticket URL: <https://trac.ffmpeg.org/ticket/10492#comment:2>
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