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+# Can the tools use FIFOs, pipes or standard output/standard input for reading/writing?
+
+## The problem
+
+Use cases include uploading or playing a file while muxing is still in progress.
+
+## The answer
+
+No. All of the tools in the MKVToolNix package rely on their input and output files being fully seekable. FIFOs, pipes and standard input/output are not. Therefore they cannot be used.
+
+At the moment there are no proper error messages if you try to use a FIFO as an input or output file. However, the resulting files are most likely cut off or incorrect.
+
+Categories: [merging](Category-merging)