Transcoding with mux = ts results in black video

trying to transcode with the options "@":sout=#transcode{venc={module=avcodec{codec=h264_videotoolbox}, vcodec=h264},venc={module=vpx{quality-mode=2},vcodec=VP80},samplerate=44100}:file{dst='%@',mux=ts}"

outputs a black video

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