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Maybe it's something to do with volume metadata. I know very little about opus, but I know the gain is supposed to be saved to the opus header, and maybe your TV has expectations regarding gain metadata, and maybe it reduces the volume when there aint none. Something like the way Dialnorm works for AC3.
Until an opus expert comes along (edit: tebasuna51 posted before I submitted mine, so there's an expert here now), have a look to see if there's any gain info saved (I checked with MediaInfo in debug mode).
00009 Frame (19 bytes)
000009 Identification (19 bytes)
000009 opus_codec_id: OpusHead
000011 opus_version_id: 1 (0x01)
000012 channel_count: 2 (0x02)
000013 preskip: 312 (0x0138)
000015 rate: 44100 (0x0000AC44)
000019 ouput_gain: 0 (0x0000)
00001B channel_map: 0 (0x00)
It's possible without a gain value, players are supposed to make an assumption, and the volume is reduced as a result of that assumption. Or maybe that's complete bollocks. I don't know.
Last edited by hello_hello; 1st March 2021 at 15:09.
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