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Interlacing and field order

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Learn about the basics of interlaced video and how to set field order in Premiere Pro.

Interlaced video, noninterlaced video, and progressive scanning

Interlaced scanning of interlaced video fields compared with progressive scanning of noninterlaced video frame.

A. For interlaced video, entire upper field (odd-numbered lines) is drawn to screen first, from top to bottom, in one pass. B. Next, entire lower field (even-numbered lines) is drawn to screen, from top to bottom, in one pass. C. For noninterlaced video, entire frame (all lines in counting order) is drawn to screen, from top to bottom, in one pass. 

Interlacing is a technique developed for transmitting television signals using limited bandwidth. In an interlaced system, only half the number of horizontal lines for each frame of video are transmitted at a time. Because of the speed of transmission, the afterglow of displays, and the persistence of vision, the viewer perceives each frame in full resolution. All of the analog television standards use interlacing. Digital television standards include both interlaced and noninterlaced varieties. Typically, interlaced signals are generated from interlaced scanning, whereas noninterlaced signals are generated from progressive scanning.

Chris Pirazzi provides technical details of fields and interlacing on Lurker's Guide to Video website.

Trish and Chris Meyer provide various materials about interlacing, field order, field dominance, field rendering, and separating fields:

  • For information about exporting a PsF (progressive segmented frame) video file from Premiere Pro via Adobe Media Encoder, see this thread on the Premiere Pro user-to-user forum.

  • More about PsF video.

About field dominance and field reversal

Fields in a clip can become reversed from the state in which they were originally acquired in any of the following ways:

  • The video capture card used to capture the footage is set to the field dominance opposite that of the source device,

  • The editing or animation software that last rendered the clip had the field dominance set opposite that of the original clip,

  • The clip is set to play backward.

Create interlaced or non-interlaced clips

Ordinarily, individual interlaced fields aren’t apparent to a viewer. However, playing a clip in slow-motion, creating a freeze frame, or exporting a field as a still image can make a single field distinguishable. For these purposes, it is sometimes preferable to deinterlace the image—that is, replace pairs of consecutive interlaced fields with single non-interlaced frames. Premiere Pro can generate these new non-interlaced frames from the fields in one or two source frames.

One unwanted interlacing artifact arises from a mismatch between the field order of a clip, and that of a sequence. Field order specifies whether the field of odd-numbered lines (the upper field) or the field of even-numbered lines (the lower field) is drawn first. For example, placing a clip with upper field order in a sequence using lower field order could result in jerky playback. You can correct this problem by reversing the field order of the clip so that it matches that of the project. You use the Reverse Field Dominance option to reverse the field order.

  1. Select a clip in a Timeline panel or in the Project panel. Choose Clip > Video Options > Field Options.
  2. Select Reverse Field Dominance to change the order in which the clip fields play back.
  3. For Processing Options, select one of the following choices:

    None

    Doesn’t apply any of the Processing Options. Selecting this option does not disable Reverse Field Dominance, if that option is checked.

    Interlace Consecutive Frames

    Converts each pair of consecutive progressive-scan (non-interlaced) frames into the two interlaced fields of a single frame. This also results in the clip running at twice its original frame rate. This option is useful for interlacing clips created by animation applications not capable of generating interlaced frames. Ideally, you could use it to convert 60-fps progressive-scan animations into 30-fps interlaced video.

    Always Deinterlace

    Converts interlaced fields into non-interlaced, progressive-scan, frames. This option is useful for clips you want to play in slow motion or in freeze frame. This option discards one field (retaining the dominant field specified for the project in the Fields setting in the New Sequence dialog box, General tab). Then it interpolates the missing lines based on the lines of the dominant field.

    Uwaga:

    In a sequence with No Fields (Progressive Scan) selected in the Fields menu, Always Deinterlace retains the upper field. However, in this type of sequence, if you also select Reverse Field Dominance, Always Deinterlace retains the lower field.

    Flicker Removal

    Prevents thin horizontal details in an image from flickering by slightly blurring the two fields together. An object as thin as one scan line flickers because it can appear only in every other field. This option blurs consecutive lines 50%; it does not deinterlace the clip. It is especially useful for graphics containing thin horizontal lines.

  4. Click OK.
    Uwaga:

    To improve the appearance of video when the clip speed is not 100%, turn on frame blending. Choose Clip > Video Options > Frame Blend.

Change the field order of a clip

In the Project panel, you can change the field order of all instances of a clip in all sequences of a project.

  1. In the Project panel, right-click the clip for which you want to change the field order.
  2. Select Modify >Interpret Footage.
  3. Choose the desired Field Order option.
  4. Click OK.

Using multiselection for field options

You can apply the field dominance to multiple clips in the timeline (or project panel). The dialog can be used for any valid clip or valid track items that are not nested sequences or have no closed captioning that are in the timeline. Mixed states are also supported for field dominance. If a selection has mixed states for the field dominance field then then the checkbox displays a mixed state UI. If you press OK without changing it, the selected clip states get maintained. However, mixed states are not supported for the field processing radio buttons. If the Field Processing field has mixed states, Premiere Pro displays the state of the first selected item in the Timeline or Project panel. If you press OK without changing anything, the state gets applied to all valid selected clips, overwriting any previous mixed state.

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