#!/usr/bin/env bash

if [[ $# -ne 2 ]]; then
	echo usage: $0 file multiplier
	exit 1
fi

original=$(ffprobe -v error -select_streams a -of default=noprint_wrappers=1:nokey=1 -show_entries stream=sample_rate "$1")
desired=$(bc <<< "$original*$2")

ffplay -loop 0 -af "asetrate=$desired" "$1"