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

[Terje J. Hanssen]

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?