On 2023-12-14 12:50, Nik Armstrong wrote:
I've encountered a scenario where someone else has programmed an
ffmpeg encoding command with flags that seem puzzling, and I'm having
difficulty understanding their purpose.
The command in question is:
ffmpeg -loglevel info -y -r 29.97 -start_number 0 -i
image_sequence_%4d.png -vcodec dnxhd -vf
format=yuv422p10,colorspace=bt709:iall=bt601-6-625:fast=1 -b:v 220M
-flags +ildct output.mov
I've been struggling to find information on what the addition of ildct
does to the output. It appears to be influencing the media to perceive
it as interlaced, even though it is, in fact, progressive. Using the
flag ildct seems counterintuitive and unproductive.
The ildct flag appears only to be making the output file "think" it is
interlaced, when it is, in fact, progressive. It does not seem to be
doing anything to change the footage (quality-wise and it's still
progressive). Since someone other than myself set the flag on this
command, I am trying to figure out what effect, if any, taking it off
will do to the output.
Regards, Nik
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