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Audio Count : 280 Count of stream of this kind : 1 Kind of stream : Audio Kind of stream : Audio Stream identifier : 0 StreamOrder : 1 ID : 2 ID : 2 Unique ID : 2 Format : Opus Format : Opus Format/Url : http://opus-codec.org/ Commercial name : Opus Internet media type : audio/opus Codec ID : A_OPUS Codec ID/Url : http://opus-codec.org Duration : 485541.000000 Duration : 8 min 5 s Duration : 8 min 5 s 541 ms Duration : 8 min 5 s Duration : 00:08:05.541 Duration : 00:08:05.541 Channel(s) : 2 Channel(s) : 2 channels Channel positions : Front: L R Channel positions : 2/0/0 Channel layout : L R Sampling rate : 48000 Sampling rate : 48.0 kHz Samples count : 23305968 Bit depth : 32 Bit depth : 32 bits Compression mode : Lossy Compression mode : Lossy Delay : 0 Delay : 00:00:00.000 Delay, origin : Container Delay, origin : Container Language : en Language : English Language : English Language : en Language : eng Language : en Default : Yes Default : Yes Forced : No Forced : No Details of subtitle: General Count : 331 Count of stream of this kind : 1 Kind of stream : General Kind of stream : General Stream identifier : 0 Complete name : sub.srt File name extension : sub.srt File name : sub File extension : srt File size : 11202 File size : 10.9 KiB File size : 11 KiB File size : 11 KiB File size : 10.9 KiB File size : 10.94 KiB Stream size : 11202 Stream size : 10.9 KiB (100%) Stream size : 11 KiB Stream size : 11 KiB Stream size : 10.9 KiB Stream size : 10.94 KiB Stream size : 10.9 KiB (100%) Proportion of this stream : 1.00000 File last modification date : UTC 2021-03-29 16:20:39 File last modification date (local) : 2021-03-29 20:50:39 ```
Recommend taking a look at SUBTITLES sections 3.5 and 4.3.4.1 of https://tools.ietf.org/html/rfc8216. I can see how multi-language could get messy with the FFmpeg implementation, but it is relatively new functionality.
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