The tagged_stream_mux is an example of this kind of block. As Andrej points out, you need to make sure every input signal is actually a tagged stream.
Cheers, M On 04/20/2016 03:12 PM, Andrej Rode wrote: > Hello Jenny, > > I can try to help you, but I'm not quite sure if I am right. If I am wrong I > will be corrected soon. > >>>> Generating: "/home/jenny/Tutorials/rx_ofdm.py" >>>> Executing: "/home/jenny/Tutorials/rx_ofdm.py" >>>> Using Volk machine: sse4_2_64_orc >>>> gr::log :FATAL: geese_vcvc0 - Missing a required length tag on port 1 at >>>> item #0 >>>> thread[thread-per-block[46]: <block geese_vcvc (1)>]: Missing length tag. > > This error tells you that your block is missing a length tag in one of his > inputs. A Stream Tag on the first sample is a requirement for a tagged stream > block. This Stream Tag has to provide information about how much input data > your block has to process. > I assume you don't have an tagged stream on each of your inputs and this > causes a problem for your tagged stream block. > > Best you provide a screenshot of your example flowgraph (the relevant parts). > Based on the error it is nothing inside of your block but the way you are > trying to feed it with samples. > > Best Regards, > Andrej > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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