Hi there. I'm doing some experiments related to changing subtitle
contents with variable-size boxes.
Images related: http://imgur.com/a/IGKnm
I've made a subtitle file in .ass format with the box outline mode and
put it into a video with a green background with the following line:
ffmpeg -loop 1 -framerate 29.970 -i "Background.png" -y -c:v rawvideo -t
00:00:40 -vf subtitles=SUBS.BOXBORDER.ASS Export\SAMPLE.CROMA1.AVI
The result is a clean and crispy bordered image, as the latter one in
the link. Here the tricky part: Now I'm trying to keep a small part of a
video enclosed in the white part, so after changing the original video
from yuv420i to bgr24 (Just to be certain) I'm using filter_complex:
ffmpeg -i "ORIGINAL.M1V" -i "Export\SAMPLE.CROMA1.AVI" -y
"[out]" -c:v rawvideo -pix_fmt bgr24 Export\SAMPLE.FINALCROMA.AVI
FFmpeg does enter the original video under the croma one, but the
borders are not crispy and perfect, as the first image in the link
shows. Now, I've read a bit about yuv420 and yuv444, and that yuv420 has
the tendency of blurring the edges.
I need clean edges for the chroma vid as I'll latter use this croma
image against another video with chromakey, that way, there won't be any
outer borders showing up in the finished product. But I haven't been
able to find the way to keep things crisp, even when forcing the pix_fmt.
Can anyone help me out? Thank you for your time.
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