[FFmpeg-trac] #10576(ffmpeg:new): qsv does not deinterlace properly

[FFmpeg]

#10576: qsv does not deinterlace properly
-------------------------------------+-------------------------------------
             Reporter:  s170361683   |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  ffmpeg
              Version:  unspecified  |               Resolution:
             Keywords:  vpp_qsv qsv  |               Blocked By:
  VPP_QSV deinterlace                |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by s170361683):

 * keywords:   => vpp_qsv qsv VPP_QSV deinterlace


Old description:

> (a sample is attached)
>
> using 50i source, **DXVA** for decoding, and **qsv** for encoding, I
> thought by specifying {{{rate=field}}} and {{{deinterlace=bob}}} in
> {{{vpp_qsv}}} filter that each field would be transformed to a frame in a
> 50p output. But the result was just a non-smooth 50p file that feels like
> 25p with frames being doubled.
>
> **yadif** with {{{yadif=send_field}}} produced the desired smooth 50p
> output
>

> {{{
> ffmpeg ^
>     -hwaccel dxva2 ^
>     -hwaccel_output_format dxva2_vld ^
>     -i "50i_sample.m2v" ^
>     -c:v h264_qsv ^
>     -vf "hwmap=derive_device=qsv,vpp_qsv=rate=field:deinterlace=bob" ^
>     -y output.mp4
> }}}
>
> {{{
> ffmpeg version git-2023-09-18-fa20f5c-ffmpeg-windows-build-helpers
> Copyright (c) 2000-2023 the FFmpeg developers
>   built with gcc 10.2.0 (GCC)
> }}}

New description:

 (a sample is attached)

 using 50i source, **DXVA** for decoding, and **qsv** for encoding, I
 thought by specifying {{{rate=field}}} and {{{deinterlace=bob}}} in
 {{{vpp_qsv}}} filter that each field would be transformed to a frame in a
 50p output. But the result was just a non-smooth 50p file that feels like
 25p with frames being doubled.

 **yadif** with {{{yadif=send_field}}} produced the desired smooth 50p
 output


 {{{
 ffmpeg ^
     -hwaccel dxva2 ^
     -hwaccel_output_format dxva2_vld ^
     -i "50i_sample.m2v" ^
     -c:v h264_qsv ^
     -vf "hwmap=derive_device=qsv,vpp_qsv=rate=field:deinterlace=bob" ^
     -y output.mp4
 }}}

 {{{
 ffmpeg version git-2023-09-18-fa20f5c-ffmpeg-windows-build-helpers
 Copyright (c) 2000-2023 the FFmpeg developers
   built with gcc 10.2.0 (GCC)
 }}}

 wenbin.chen at intel.com

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Ticket URL: <https://trac.ffmpeg.org/ticket/10576#comment:2>
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