DV field based or frame based

[yup]

Hi folk!
Simple question. If i have DV footage (ordinary interlaced) this frame or field based? How work hardware DV encoder in mini DV camera encoded frame or field?
With kind regards yup.

[Video Dude]

It is field based.

To be specific it is bff (bottom field first).

[bb]

It depends - there's frame based DV, too. But there aren't many camcorders available that support progressive scan. Mine supports interlaced and progressive, so I can record field based and frame based video.

bb

[yup]

Video Dude and bb thanx for reply.
I want know how encode DV interlaced source by field or by frame? Encoder separate frame to field before DCT or no?
yup.

[HighInBC]

I find that the following avisynth line deinterlaces my cam's footage fine:

Telecide(order=0,guide=0,post=4,vthresh=29)

you may have to adjust vthresh, and/or set post to 2 if you don't get the desired effects...

[bb]

Telecide is not the appropriate filter to deinterlace DV video. You should use it to remove a phase-shift in progressive material, but the only real deinterlacing you get with this filter is in post-processing - but that's not intended to be used for deinterlacing in the first place.

Use deinterlacers like KernelDeint, FieldDeinterlaced, TomsMoComp, etc.

bb

[bb]

Back to yup's original question:

Unlike most MJPEG codecs DV is encoded on a frame basis. DV can use 4x8 blocks besides the common 8x8 blocks to improve interlaced encoding.

Read more here: http://www.adamwilt.com/DVvsMJPEG.html

bb

[HighInBC]

Originally posted by bb
Telecide is not the appropriate filter to deinterlace DV video. You should use it to remove a phase-shift in progressive material, but the only real deinterlacing you get with this filter is in post-processing - but that's not intended to be used for deinterlacing in the first place.

Use deinterlacers like KernelDeint, FieldDeinterlaced, TomsMoComp, etc.

bb

Thank you, I will try those...

[hendrix]

be careful when shoot in "Frame" mode - it's usually used for capturing stills from DV - it's not for making your footage look like "film". If you want to deinterlace your DV footage make sure your shutter speed is set to 1/60(NTSC) or 1/50(PAL) or you'll get ghosting

[bb]

hendrix,

there's "progressive photo shot" and "progressive scan". The first is for shooting photos only, which are written as a few seconds of frame based DV onto tape, whereas the latter is for shooting progressive video.

bb

[hendrix]

Originally posted by bb
hendrix,

there's "progressive photo shot" and "progressive scan". The first is for shooting photos only, which are written as a few seconds of frame based DV onto tape, whereas the latter is for shooting progressive video.

bb
ya i know - progressive scan or 30p was really designed to help reporters or techs in ENG environments to pull out stills from video, you can shoot the video and not worry about interlaced combing if your video is progressive - it's easier to record 30p and pick out the shots later than to press the shot key and hope you got the timing right - 30p is choppy and doesn't look like film (you'd have to drop out every fourth frame for 30p to 24p conversion) where as for 30i all you have to do is do a 3:2 pulldown removal.

[bb]

That may be true for NTSC, I don't know. But for PAL there's no need for dropping frames: you record at 25 fps, and playback is at 25 fps, too.
(Once again I'm glad that I live in PAL land :) )

bb

[hendrix]

Originally posted by bb
That may be true for NTSC, I don't know. But for PAL there's no need for dropping frames: you record at 25 fps, and playback is at 25 fps, too.
(Once again I'm glad that I live in PAL land :) )

bb
ya that's the one nice thing about PAL - no need for pulldown - but NTSC has one thing i like - you dont have to slow down the video to get film frame rate thus keeping the sound pitch intact