#!/usr/bin/env python2 import sys, subprocess if len(sys.argv) > 1: ifile = sys.argv[1] encopt = sys.argv[2:-1] ofile = sys.argv[-1] else: print 'usage: %s <input> [encode_options] <output>' % sys.argv[0] sys.exit(1) analysis_cmd = 'ffprobe -v error -of compact=p=0:nk=1 ' analysis_cmd += '-show_entries frame_tags=lavfi.r128.I -f lavfi ' analysis_cmd += "amovie='%s',ebur128=metadata=1" % ifile try: probe_out = subprocess.check_output(analysis_cmd, shell=True) except subprocess.CalledProcessError, e: sys.exit(e.returncode) loudness = ref = -23 for line in probe_out.splitlines(): sline = line.rstrip() if sline: loudness = sline adjust = ref - float(loudness) if abs(adjust) < 0.0001: print 'No normalization needed for ' + ifile else: print "Adjust %s by %.1fdB" % (ifile, adjust) norm_cmd = ['ffmpeg', '-i', ifile, '-af', 'volume=%fdB' % adjust] norm_cmd += encopt + [ofile] print ' => %s' % ' '.join(norm_cmd) subprocess.call(norm_cmd)