Playback of chained Opus files is unsupported
Sample: https://jmvalin.ca/misc_stuff/chain_works.opus
Expected result (generated with opusdec from https://git.xiph.org/?p=opus-tools.git):
http://people.videolan.org/~tmatth/chain_works.wav
My guess is that this is an ogg demuxer limitation but the Opus decoder may need to be adapted as well.