| #!/usr/bin/env python2 |
| |
| import sys, subprocess |
| |
| if len(sys.argv) > 2: |
| 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) |
