Wrong length of output video

[Levelleor]

I have 5555 images in png image sequence. I have tried to create video via avidemux 2.6.x version applying framerate filter up to 30(I rendered to make it 30 fps) but the output is around 6 minutes. Can not understand why. Like 5555/30/60=3.086 minutes, as I need to make...

Also tried to make same thing with older versions of avidemux, the 2.5.1 one. But here, when i set the Video->Framerate up to 29.99 it makes loop of the video for 15 minutes!

I have tried several codecs like MPEG-4 ASP (lavc), Huffyuv (avcodec) and few popular in the newer version like H.264, can not remember the other one...

What am I doing wrong?
Any questions or screenshots or other stuff are welcome to solve the problem.

Thank you for attention!

[Jan Gruuthuse]

Test with 15 fps? Some kind of issue with interleaved or progressive perhaps?

Interlaced: 1080i
Full frame: 720p, 1080p

interlaced: plays back at 50/60 frames per second, actually broadcast is 25/30 frames per second.
1/2 frame shown in (50^th/60^th) second
- 1st pass is 1.920x540 even scan line field.
- 2nd pass is 1.920x540 odd scan line field.

progressive: drawn line after line, so they're not interlaced.
full frame shown in (25^th/30^th) of a second