vlc and encoding opus

[andrew46]

I have compiled the latest git vlc as well as libopus 1.1 and I have been looking for the opus encoder in the gui. It is listed there from the commandline:

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andrew@corinth:~$ cvlc --list | grep opus VLC media player 2.2.0-git Weatherwax (revision 806a5a5) opus Opus audio decoder opus Opus audio encoder

but I cannot see the option in the 'Convert/Save' section of vlc. My apologies for probably missing something very obvious.

[andrew46]

I suspect that I can answer my own question: not all encoders and certainly not all options are available through the gui and Opus encoding is one of these. I put the following commandline together:

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cvlc -vvv --sout \ "#transcode{acodec=opus,ab=96,channels=2,samplerate=44100}:\ std{access=file,mux=ogg,dst=test.opus}" \ luckynight.wav vlc://quit

and this worked well (although I noticed some stuttering at the beginning of the track). Mediainfo reported the resulting file as:

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andrew@corinth:~/Desktop$ mediainfo test.opus General Complete name : test.opus Format : OGG File size : 720 KiB Duration : 1mn 0s Overall bit rate : 97.6 Kbps Writing application : VLC media player Audio ID : 1552885330 (0x5C8F2652) Format : Opus Duration : 1mn 0s Channel count : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz Compression mode : Lossy Writing library : libopus 1.1

The only puzzle being the failure to convert the sampling rate, possibly I have bumped into a requirement of opus files... I shall research a little further.

[Jean-Baptiste Kempf]

Opus mandates 48kHz

[andrew46]

Thanks for confirming this.