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From the tshark.c source code:

if (print_packet_counts) {
    /* We're printing packet counts. */
    if (packet_count != 0) {
        fprintf(stderr, "\r%u ", packet_count);
        /* stderr could be line buffered */
        fflush(stderr);
    }
}

Since the packet count is written to stderr, you should be able to redirect it to /dev/null to suppress it, e.g.:

tshark -i eth1 > packet.log 2> /dev/null &