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

[Terje J. Hanssen]

Den 24.11.2024 23:30, skrev Andrew Randrianasulu:
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> пн, 25 нояб. 2024 г., 01:11 Terje J. Hanssen <terjejhanssen at gmail.com>:
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>     Den 24.11.2024 22:22, skrev Andrew Randrianasulu:
>>
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>>     вс, 24 нояб. 2024 г., 19:45 Terje J. Hanssen
>>     <terjejhanssen at gmail.com>:
>>
>>
>>         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 rendered also with global_quality=25 (switched on in Cingg
>     preset), which then gives higher bitrate and quality comparable
>     with the output from the native ffmpeg 7.1.
>
>
>
> Hm. Then I guess I have no other way but to disable autoadding this 
> flag especially for qsv(av1/h264/vp9).
>
> You can try to make other qsv profiles with "format set to progressive 
> hack" in the meantime. (there should also be mjpeg and mpeg2 encoders 
> - not most useful but it will be interesting to know if they share 
> same chocke-on-ildct behavior with av1/h264/vp9.)
>
>
I have  not found other interlaced test files, and I think 1080i hdv as 
already tested are the main source for interlaced mpeg2.
The other mpeg2 video files I have prepared for dvd via ffmpeg and dvde, 
are all progressive.

 From the url below I have tested a few mjpeg clips. Mediainfo doesn't 
report  any scan type about them, so I think they are not field 
interlaced but frame based, as they also render ok with av1_qsv. Else 
they seems to be faulty possibly with regards to timing, as the playback 
speed seemingly is all too fast
https://filesamples.com/formats/mjpeg?utm_content=cmp-true




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