Sorry for replying so late. I've been using pipes with file sources and sinks. One trick you have to do is start the consumer before the producer. For some reason if the writing on the pipes starts before the reading, things get messed up. Try starting the transmitter reading the pipe before you start the process that writes to the pipes. That did the trick for me.
Charles On Mon, Mar 7, 2011 at 20:34, Marcus D. Leech <[email protected]> wrote: > ** > > On Mon, Mar 7, 2011 at 2:45 AM, Tom Hendrick <[email protected]> wrote: > >> Thanks Tom, >> >> I'm a beginner still with linux/GNURadio so I couldn't really find any >> information that makes sense as to how gr-atsc handles the fifo piping. >> >> I had seen an example online of someone that had done a transmission using >> the USRP and piping. They had piped the output of gstreamer using mkfifo >> like I had tried but I can't get any output on the USRP when I read from the >> file created by mkfifo. >> >> http://wiki.oz9aec.net/index.php/Simple_DVB_with_Gstreamer_and_GNU_Radio >> >> -Tom >> > > Hi tom, > > Maybe the program you use for writing the video to the file uses some > operations that only work on regular files? You may compare it to > gnuradio/core/src/lib/io/gr_file_sink.cc which works well with named pipes. > Also note that applications that use named pipes are frozen until both ends > of the pipe are open. So if both applications are running then the "pipe > connection" should be OK and the problem could be data type mismatch or > something like that. > > Alex > > So, you have to make sure that your "producer" isn't buffering really > large amounts of data. Also, stupid question, are you producer and > consumer processes both executing at the same time, and if so, how are > you arranging that? > > > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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