[FFmpeg-devel] qsvenc.c & AV_CODEC_FLAG_INTERLACED_DCT

[Wang, Fei W]

On Thu, 2024-11-21 at 11:50 +0300, Andrew Randrianasulu wrote:
> Hello.
> 
> 
> Recently I teached cinelerra-gg to use qsv encoders in ffmpeg
> (libavcodec)
> and some test were working but some not.
> 
> We nailed it down to top-field first  material, like HDV files. bff
> files
> like consumer version of DV and progressive worked fine.
> 
> I looked at source and ... I thought condition at
> 
> http://git.ffmpeg.org/gitweb/ffmpeg.git/blob/HEAD:/libavcodec/qsvenc.c#l852
> 
> 
> must contain case for bff, but I tried this and it was reportedly not
> helping?
> 
> 
> We currently set flags = ildct+ilme on interlaced streams, I hope to
> avoid
> special-casing qsv encoders, but may be we have no other choice?
> 
> I asked user (Terje) to add +ildct flag to his normal system ffmpeg
> line
> and it started to fail too:
> 
> https://lists.cinelerra-gg.org/pipermail/cin/2024-November/009123.html

AV1 doesn't support interlaced frame. You may add deinterlace filter
before encoder after apply this patch:
https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=13372

cmd:
ffmpeg -hide_banner -qsv_device /dev/dri/renderD128 -
hwaccel_output_format qsv -i input.mp4 -pix_fmt nv12 -vf
vpp_qsv=deinterlace=advanced -c:v av1_qsv -f null -

Thanks
Fei

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