How to use ffmpeg to encode ogg audio files?

Question

I want to convert the following simple oggenc command to use ffmpeg instead:

oggenc -b 8 input.wav -o out.ogg

From the ffmpeg libvorbis wrapper doc, it says,

The following options are supported by the libvorbis wrapper. The oggenc-equivalent of the options are listed in parentheses.

  b (-b)

Set bitrate expressed in bits/s for ABR. oggenc -b is expressed in kilobits/s.

But I just don't know how to apply it to ffmpeg, I've tried,

ffmpeg -i input.aac -c:a libvorbis -b 8 out.ogg
ffmpeg -i input.aac -c:a libvorbis b 8 out.ogg
ffmpeg -i input.aac -c:a libvorbis=b:8 out.ogg

but none is working as expected.

UPDATE: What I want to know is how to "translate" the options listed in ffmpeg (libvorbis wrapper) doc into ffmpeg command. I can get away with -ab switch to do the transcode, but I don't think it is the libvorbis wrapper specific options. So if you provide the answer, please provide the demo specifying all the following options as well.

b (-b)

q (-q)

minrate (-m)

maxrate (-M)

iblock

Solution 1

The answer is in your question:

oggenc option    corresponding ffmpeg option
-b               -b:a
-q               -q:a
-m               -minrate
-M               -maxrate

Example command

ffmpeg -i input.aac -c:a libvorbis -b:a 8k output.oga

If your desired value of 8k fails then use a higher bitrate or lower your audio sampling rate with -ar, such as -ar 8000.

Encoder and muxer info

You can see additional info and the single private option that is specific to this encoder with:

ffmpeg -h encoder=libvorbis

You can also get info about the muxer/output container format:

ffmpeg -h muxer=ogg

Solution 2

This works for me:

ffmpeg -i test.aac -c:a libvorbis -b:a 64k test.ogg

I don't think 8kb/s is a valid value, but I could be wrong. :-)

Comments

[xpt]

8kb/s is a valid value for vorbis/oggenc. that's why I'm using it, and your answer is not. Welcome abroad, BTW.

[Elisa Cha Cha]

Consider adding -c:a libvorbis to your example, otherwise the flac encoder may be chosen by default instead (if you choose .oga which is typically for audio only).

[xpt]

Sorry I wasn't clear on what I want to know. OP updated.

[xpt]

Thanks. It'd be great if a full example of command-line is provided. And BTW, the answer is not in my question, as I don't know how you know minrate (-m) is just -minrate, not -minrate:a whereas b (-b) somehow magically becomes -b:a. Neither ffmpeg -h encoder=libvorbis, nor ffmpeg -h muxer=ogg, or the online-doc provide that info.

[Elisa Cha Cha]

The documentation was probably written before some options got the ability to use stream specifiers. If you just use -b then ffmpeg will tell you to use -b:a instead.

[Avatar]

Use 32k or 64k because "8k" won't work and throw: "encoder setup failed Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height"