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https://en.wikipedia.org/wiki/Interlaced_video
Interlaced video is designed to be captured, stored, transmitted, and displayed in the same interlaced format. Because each interlaced video frame is two fields captured at different moments in time, interlaced video frames can exhibit motion artifacts known as interlacing effects, or combing, if recorded objects move fast enough to be in different positions when each individual field is captured.
https://forum.videohelp.com/threads/390264-Unsure-whether-my-Motion-JPEG-video-is-progressive-or-interlaced
Sep 22, 2018 · Most of MJPEG codecs works as progressive i.e. interlaced frame (made form both fields) is compressed as progressive frame - this lead to unavoidable artefacts (Gibbs effect) - MJPEG is not the best choice. You may try to encode fields with MJPEG to avoid issues (separate fields and later combine them).
https://www.sony.com/electronics/support/articles/00032537
Interlaced Video: Video sources that are listed with the letter i are called interlaced. An example of this would be 480i or 1080i. Interlaced video displays even and odd scan lines as separate fields. The even scan lines are drawn on the screen, then the odd scan lines are drawn on the screen.
http://www.ffmpeg-archive.org/Interlaced-frames-not-recognized-as-such-td4664930.html
Interlaced frames not recognized as such Summary: Frames from an interlaced file created using ffmpeg's tinterlace and fieldorder filters are not recognized as interlaced by ffmpeg. Now I wonder if I used the wrong CL for creating the file or if interlaced detection fails in this case.
https://forum.kodi.tv/showthread.php?tid=81834
Dec 24, 2010 · To start, the current frame is written to the frame buffer. After the first vertical sync (either field 1 or 2 has just been displayed) the top field of the future frame (field 3) is written over the top field in the frame buffer (field 1) leaving the bottom field untouched (field 2).5/5(1)
http://www.ffmpeg-archive.org/Interlaced-x264-td4675482.html
For MBAFF, this disadvantage may not exist but the "interlaced" output would still be progressive because the input was progressive. If you use progressive encoding for interlaced input you need a (very) much higher bitrate to get acceptable quality.
https://www.videoconverterfactory.com/tips/interlaced-video.html
Most modern displays, such as LCD, DLP and plasma displays, only work in deinterlace mode, because they are fixed-resolution displays and only support progressive scan. In order to display interlaced signal on such displays, the two interlaced fields must be combined into one progressive frame with...
http://www.infognition.com/tutorials/rip_guides/interlaced.html
Always remember that in an interlace video, every frame will be interlaced. If the video cotain a mix of interlaced and progressive frames, it's usually a telecined video and should not be deinterlaced, but IVTC in order to restore the progressive frames. First, one should always verify that an interlaced video has the correct field order.
https://lurkertech.com/lg/fields/
You might think that you could generate synthetic video by taking the output of a frame-based renderer at 30M frames per second and pulling two fields out of each frame image. This will not work well: the motion in the resulting sequence on an interlaced video monitor will noticeably stutter, due to the fact that the two fields are scanned out at different times, yet represent an image from a single time.
http://www.mir.com/DMG/interl.html
It just sees a stream of alternating upper and lower fields. Keep in mind that two interlaced fields do not make a progressive frame! The scanlines of a single progressive frame are all sampled starting at the single point in time. Interlaced fields are sampled starting at different points in time. In the above figure, you can see that the red ball moves downward between fields.
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