Input #0, ogg, from '1.ogg':
Duration: 00:00:01.76, start: 0.006500, bitrate: 65 kb/s
Stream #0:0: Audio: opus, 48000 Hz, mono, fltp
Metadata:
encoder : Lavf57.56.100
Input #0, ogg, from '2.ogg':
Duration: 00:00:02.23, start: 0.000000, bitrate: 61 kb/s
Stream #0:0: Audio: vorbis, 48000 Hz, mono, fltp, 80 kb/s
Metadata:
encoder : Lavc61.31.101 libvorbis
