Zitat von Torquil Macdonald Sørensen <[EMAIL PROTECTED]>: > On Tuesday 22 January 2008, Oliver Bandel wrote: > > Zitat von Torquil Macdonald Sørensen <[EMAIL PROTECTED]>: > > > Hello, sorry to ask so many questions... I am trying to get > plplot to > > > rewrite > > > the plot to the same file several times (part of my quest to > write to > > > a pipe > > > into ffmpeg). In between plots (plbop().....pleop()) I delete the > > > file > > > > [...] > > > > > > When you give the outputfile the name "-" > > plplot-lib will write to stdout!!! > > > > You can make your executable that writes > > a stream to stdout and then redirect the output of > > your file into the fifo! > > > > $ my-stream-generator > my_fifo > > > > > > But at the other end of the fifo, > > then you maybe have to cut the stream into seperated files... > > ...depends on your reading process / program, if it can read > > plplot-lib's output directly. > > Hello Oliver, thanks for your suggestion and explanation about how > plbop() > works with the JPG-driver. I had already tried using the STDOUT > instead of an > ordinary file in plplot, but it didn't work to use the data that > plplot wrote > to stdout as input to ffmpeg. From what I could understand it was not > equivalent to "cat *.jpg | ffmpeg_command". I ended ut with only one > frame in > the ffmpeg-generated video. > > But I have managed to find a workaround for now (it works but is a > bit > inefficient). I start and stop plplot between each plot page with > plinit() > and plend(). Between each plot I then send the newly created > "file.jpg" into > an ofstream that is really a FIFO-file "fifo.mjpeg" (which is > equivalent to > STDOUT, but nicer, I think). [...]
Yes, sending the data directly to the FIFO makes sense. I think that is the best way to do it. I should have had that idea, and earlier also. ;-) Ciao, Oliver ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Plplot-general mailing list Plplot-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-general
