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Top Forums Shell Programming and Scripting How to run feeding each other processes simultaneously? Post 303031978 by Corona688 on Friday 8th of March 2019 10:46:31 AM
Old 03-08-2019
Probably because your commands aren't written to work that way.

wget must write to a pipe, not a file, second command must read from pipe, not file, etc, etc, etc.

For wget, that means -O - to make it write to standard output. not sure what that means for ffmpeg, etc. If - doesn't work as an input/output filenames, /dev/stdin and /dev/stdout might.

Last edited by Corona688; 03-08-2019 at 12:29 PM..
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pfsoutffmpeg(1) 					      General Commands Manual						   pfsoutffmpeg(1)

NAME
pfsoutffmpeg - Read pfs frames from stdin and forward them to ffmpeg program SYNOPSIS
pfsoutffmpeg [--help] <ffmpeg options> output_file DESCRIPTION
This command is a wrapper for ffmpeg program and can be used to write pfs frames to a compressed video. Check the examples section to for sample usage and see manual of ffmpeg for further information. Note that the usage of '-f' switch (input format specifier) and '-i' switch (input file specifier) of the ffmpeg program is implemented inside the script and is therefore not allowed. EXAMPLES
pfsinrgbe frame%04d.hdr --frames 100:2:200 | pfstmo_reinhard02 -s | pfsgamma -g 1.7 | pfsoutffmpeg -qscale 4 test.avi 1. Read HDR frames in RGBE format with the following names: frame0100.hdr, frame0102.hdr, frame0104.hdr,... frame0200.hdr 2. Apply local tone mapping operator to each frame (Reinhard2002 model, part of the PFSTMO package) 3. Apply gamma correction to each tone mapped frame 4. Compress frames to test.avi animation SEE ALSO
ffmpeg(1) pfsin(1) pfstmo_reinhard02(1) pfsgamma(1) BUGS
Frames smaller than 512x384 can cause broken pipe error, due to bug in ppm pipe reading routine in ffmpeg. Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de> or Grzegorz Krawczyk <krawczyk@mpi-sb.mpg.de>. pfsoutffmpeg(1)
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