[FFmpeg-user] Meaning of ffprobe output

Ulf Zibis Ulf.Zibis at gmx.de
Mon Jan 28 23:52:38 EET 2019

Am 19.01.19 um 17:30 schrieb Moritz Barsnick:
>> Well, but the software player could send 50 frames per second with alternately updating only each 2nd top/bottom line.
> It could. But if the display is anything else than an old CRT, it will first deinterlace internally.
Why should it do this?  There is nothing to deinterlace it the display
is fed with 50 full frames per sec., but with only each 2nd line
alternately updated with new data.

> LEDs and LCDs would give you headaches if they displayed alternating lines, as the "afterglow" effect of CRTs, retaining the line's content, is not present.

If each 2nd line would be empty (black) you may be right, but if the
intermediate lines are filled with the content of the before frame, you
have the "afterglow" effect perfectly simulated also on LCD and LED.


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