For the GUI version, in the options menu I have selected "hint for rtp / rtsp". Then, on the Mux tab, I added a mp4 file with an add button. After that, click the Mux button in the lower right corner.
It creates a multiplex version in the same directory path of your mp4 file. You can use save as for another location.
A recently created file worked for me and did not throw a PVMFErrContentInvalidForProgressivePlayback error.
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