[HELP] Converting 25p to 25i using Low Pass Filter in ffmpeg

[jan2ooo]

Hey.

Regarding FFMPEGs "interlace" Filter I would like to create an 25i prores422hq file from an 25p source with correct metadata (Interlaced, TFF). No frame interpolation, one frame should result in two fields. But I don't know how to handle the parameters  

Frame (25p): (1), (2), (3), (4), ...
Frame (25i Fields): (11), (22), (33), (44), ...

Thank you!

[Selur]

you probably want something like:

ffmpeg -i "F:\TestClips&Co\files\test.avi" -vcodec prores_ks -profile:v 3 -vf tinterlace=4 -flags +ildct+ilme -vtag apch -f mov "E:\Output\test.mov"

where:

-vf tinterlace=4

converts the content to tff interlaced (see: https://www.ffmpeg.org/ffmpeg-all.html#tinterlace)
( '-vf interlace=scan=tff' should also work; see: https://www.ffmpeg.org/ffmpeg-all.html#interlace)
and

-flags +ildct+ilme

makes sure the output is flagged as interlaced (see: https://www.ffmpeg.org/ffmpeg-all.html#t...ec-Options)

Cu Selur

[jan2ooo]

Thank you! Buw how to setup the flag (complex_filter, cvlpf)? A simple copy/paste of

ffmpeg -i "F:\TestClips&Co\files\test.avi" -vcodec prores_ks -profile:v 3 -vf tinterlace=4 -flags +ildct+ilme -vtag apch -f mov "E:\Output\test.mov"

will result in a 12,5fps Quicktime with separate odd and even fields in one frame.

https://ibb.co/hMqrk04

[Selur]

will result in a 12,5fps Quicktime with separate odd and even fields in one frame.

oh, I overlooked that you wanted 25i.
try adding "-r 25"

Buw how to setup the flag (complex_filter, cvlpf)?

Assuming you are referring to tinterlace:

-vf tinterlace=mode=4:flags=cvlpf

Cu Selur

Ps.: if that doesn't work you probably have to 1st convert 25p to 50p and then convert it to 25i.

[jan2ooo]

try adding "-r 25"

Sorry, where? I am a ffmpeg noob

[Selur]

I am a ffmpeg noob

somewhere behind the input

[jan2ooo]

if that doesn't work you probably have to 1st convert 25p to 50p and then convert it to 25i.

Sorry, I was off for three days. I will try your suggestions asap. Thanks a lot!