[Cin] Fwd: [FFmpeg-devel] qsvenc.c & AV_CODEC_FLAG_INTERLACED_DCT

[Andrew Randrianasulu]

On Mon, Nov 25, 2024 at 6:27 PM Terje J. Hanssen
<terjejhanssen at gmail.com> wrote:
>
>
> Den 25.11.2024 11:20, skrev Mat:
> > On Sun, 24 Nov 2024 23:11:07 +0100
> > "Terje J. Hanssen via Cin" <cin at lists.cinelerra-gg.org> wrote:
> >
> >> Den 24.11.2024 22:22, skrev Andrew Randrianasulu:
> >>>
> >>> вс, 24 нояб. 2024 г., 19:45 Terje J. Hanssen
> >>> <terjejhanssen at gmail.com>:
> > <snip>
> >>>      I can't notice differences at playback with VLC and FFplay
> >>> (other than 16:9 vs 4:3 format as usual). And both visually with
> >>> good qualities in my eyes.
> >>>
> >>>      Cingg Set Format Interlace Mode: Not interlaced
> >>>      did the trick and both hdv and hd could be rendered
> >>>      FFprobe reported it is pgogressiv, while native FFmpeg
> >>> transcoding still say interlaced.
> >>>
> >>>
> >>>
> >>> But do files rendered by cingg set to progressive and ffmpeg from
> >>> same tff source differ visually?
> >> No. It is easy to see during VLC  playback that neither av1_qsv from
> >> Cin/ffmpeg is progressive, but rather interlaced:
> >> Pause during horizontal movements (camcorder panning) shows
> >> interlaced vertical edges. Then shortcut "D" on this still image
> >> swithch it to deinterlaced and smoother edges. This is on a computer
> >> LCD monitor.
> >
> > I've have that problem as well, converting old VHS videos in PAL format
> > to MP4 format. My solution is to use ffmpeg before editing in CinGG,
> > using a de-interlace filter, as follows:
> >
> > ffmpeg -i inputvideo -vf bwdif outputvideo.mp4
> >
> > Using mp4 as output format also reduces the original mpeg file to half
> > the size. Instead of the -vf bwdif you can use the -vf yadif
> > filter, but bwdif gave slightly better results for my videos.
> >
> > MatN
>
> For end-user formats like AV1 and HEVC etc. I don't think interlaced
> video is an issue as mediaplayers handle it simply.
> What I don't understand is why my system ffmpeg 7.1 is capable to
> transcode tff interlaced input video to av1_qsv, while Cingg's internal
> ffmpeg 7.0 error out due to unsupported pixel structure. May something
> have changed here between ffmpeg 7.0 and 7.1?


ffmpeg by default does not add +ildct flag, we do (if input is interlaced)

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