Interlaced video features fast motion, particularly lateral motion, exhibiting combing where the presence of individual fields becomes noticeable and detracts from the clip.
Interlaced footage is used primarily in analog formats and is not as widely used in digital video production. In progressive video, each frame is its own image. This means every second of video shot at 24 frames per second contains 24 individual frames.
Interlaced footage utilizes two fields, one containing all the even pixels in a frame, one field containing all the odd pixels, captured at different times. A video captured at 50i displays even and odd frame lines 25 times each for a total of 50 fields per second. Shutterstock currently accepts both interlaced and progressive footage, but interlacing cannot be distracting within a clip. This interlacing issue detracts from the clip and is not acceptable. Footage exhibits blurring due to frame blending.
Action within the video is superimposed or doubled, creating inconsistent, blurry movement. Interlacing can cause issues, though, trying to deliver that feed to a progressive source due to the differences in presentation between the two.
Unlike interlaced content, progressive video is a video track that consists of complete frames. There is a slight asterix to this statement as techniques like interframe can be used to compress video content to remove redundancies from frame to frame read more about the interframe process. Even including this technique, progressive video content will not alternate fields and will present a full keyframe that you will never find in interlaced content.
Consumers will be familiar with this terminology due to its proliferation in HD content. Many playback methods, like computer monitors or modern HD TVs, do not support interlacing. So even if interlacing provided better looking content, a broadcaster would still want to go with progressive delivery due to support for this method.
Otherwise, the broadcaster would be displaying interlaced video in a progressive format. Sometimes a broadcaster needs to use an interlaced source for streaming. In other words, taking an interlaced source and make it progressive or watching it in a progressive medium, like a computer monitor. This need can range from wanting to use an older broadcast to using an analogue camera that supports interlacing.
Converting the video involves combining the two fields, that were created as part of the interlacing process, into a single frame. By default, this process creates a rather ugly artifact on high motion in the video track. The motion between fields can cause visible tearing when displayed as progressive video. Essentially, the video track shows two different line fields where the fast motion is occurring, creating a staggered line appearance as seen in the image below on the figure to the left.
Left: Interlaced video shown in a progressive format. Right: Deinterlaced video more on this later. A lot of analogue cameras, for example, are setup to deliver video in an interlaced manner. Even some modern digital cameras still offer interlaced mode. One method to tell if your camera was setup for interlaced content or not is in the specs. While some will be overt, describing that the camera outputs in interlaced mode, others will state it in their mentioned resolution.
For example, we already discussed that p is an HD feed that is progressive. Chances are good that someone has seen p content much more frequently than the interlaced version. Most modern analogue cameras, if they are interlaced, should mention it either directly or with the resolution. Be kind and respectful, give credit to the original source of content, and search for duplicates before posting.
Learn more. Jump to latest reply. Steve Griffiths. It will be de-interlaced in this sequence. However you are effectively losing half your vertical resolution by deinterlacing. Ann Bens. I would drop the interlaced footage in an interlaced sequence and export to progressive. Post Reply. Troubleshooting PC hardware. Troubleshooting Mac Hardware. Troubleshooting Premiere Pro Software. Premiere Pro Troubleshooting Documents. Video Hardware Forum.
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