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fifos are not for saving or reading more than once. You may find tee better suited to your goals.

Untested guess at what you want(split a network stream):

mkfifo myfifo1 myfifo2 && curl -s http://192.168.1.27:8554 | tee myfifo1 > myfifo2;

Other guess at what you want(display and save on rpi):

raspistill --fullpreview --output - >> jpgs.dat

or using more than one file in a loop

raspistill --fullpreview --output $(date +%Y%M%dT%H%m%S).jpg

or using raspivid

raspivid -fps 1 --timeout 0 --fullscreen --output $(date +%Y%M%dT%H%m%S).h264

Note that you can set the fps on raspivid and with it's temporal compression it may be better than looping raspistill in some conditions.

fifos are not for saving or reading more than once. You may find tee better suited to your goals.

Untested guess at what you want(split a network stream):

mkfifo myfifo1 myfifo2 && curl -s http://192.168.1.27:8554 | tee myfifo1 > myfifo2;

Other guess at what you want(display and save on rpi):

raspistill --fullpreview --output - >> jpgs.dat

or using more than one file in a loop

raspistill --fullpreview --output $(date +%Y%M%dT%H%m%S).jpg

or using raspivid

raspivid -fps 2 --timeout 0 --fullscreen --output $(date +%Y%M%dT%H%m%S).h264

Note that you can set the fps on raspivid and with it's temporal compression it may be better than looping raspistill in some conditions.

fifos are not for saving or reading more than once. You may find tee better suited to your goals.

Untested guess at what you want:

mkfifo myfifo1 myfifo2 && curl -s http://192.168.1.27:8554 | tee myfifo1 > myfifo2;

Then read the 2 files with vlc and omxplayer, or do the things with the now duplicated data stream.

Note that you can set the fps on raspivid and with it's temporal compression it may be better than looping raspistill in some conditions.

fifos are not for saving or reading more than once. You may find tee better suited to your goals.

Untested guess at what you want(split a network stream):

mkfifo myfifo1 myfifo2 && curl -s http://192.168.1.27:8554 | tee myfifo1 > myfifo2;

Other guess at what you want(display and save on rpi):

raspistill --fullpreview --output - >> jpgs.dat

or using more than one file in a loop

raspistill --fullpreview --output $(date +%Y%M%dT%H%m%S).jpg

or using raspivid

raspivid -fps 1 --timeout 0 --fullscreen --output $(date +%Y%M%dT%H%m%S).h264

Note that you can set the fps on raspivid and with it's temporal compression it may be better than looping raspistill in some conditions.

fifos are not for saving or reading more than once. You may find tee better suited to your goals.

fifos are not for saving or reading more than once. You may find tee better suited to your goals.

Untested guess at what you want:

mkfifo myfifo1 myfifo2 && curl -s http://192.168.1.27:8554 | tee myfifo1 > myfifo2;

Then read the 2 files with vlc and omxplayer, or do the things with the now duplicated data stream.

Note that you can set the fps on raspivid and with it's temporal compression it may be better than looping raspistill in some conditions.