how 25p is converted into 50i

[pmsf]

I am encoding one movie from Blu-Ray source. The source is H264 1080i. I used mediainfo to check the source and found its 25 fps. I also used eac3to to check it and found it is 50i. I tried add seperatefield() in the avs, and found the pattern that one field is always replicated once. It is not a pure interlace. what kind of interlace is it? and what kind of filter should I use?

I tried to encode a small part of this movie without deinterlace filter. The result seems fine, no ghost or interlaced pattern. Does that mean I dont need a deinterlace filter to encode it?

[hanfrunz]

You have progressive material. You don't need to deinterlace. I think there is no 1080p for BR, so you have to put you progressive material in a interlaced video, like it's always done on dvd or SD-television broadcast.

[2Bdecided]

You can have 1080p24 but not 1080p25 on BluRay, so you have 1080p25-in-1080i50. You don't need to do anything special with it.

Cheers,
David.

[smok3]

I tried to encode a small part of this movie without deinterlace filter
if it is a film (movie) material then you can in most cases conclude that 2 fields are the same, so no deinterlace needed.

[pmsf]

thanks for all your response. Now I can be sure I didnt make mistakes.