My first post here - please let me know if I do something wrong.
Question:
How does 'convert' respond to named pipes? I've tried various
invocations like the following, but get no output (on my FreeBSD box)
from convert no matter what command line I try. .
mkfifo stream.yuv
mplayer -vo yuv4mpeg deepforest01.asf &
convert -size 640x480 stream.yuv deepforest.png
jpegtools in the above command line writes to the named pipe
./stream.yuv by default, and the mjpegtools use the same default. The
following is clipped from the mplayer man page, concerning it's yuv4mpeg
output option:
"yuv4mpeg
Transforms the video stream into a sequence of uncompressed YUV 4:2:0
images
and stores it in a file (default: ./stream.yuv). The format is the
same as
the one employed by mjpegtools, so this is useful if you want to
process the
video with the mjpegtools suite. It supports the YV12, RGB (24 bpp)
and BGR
(24 bpp) format. "
My goal is to extract frames from a cheap DV camera (ASF format) and
process them with Magick tools before muxing back to a DVD format.
What am I missing?
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