I had separate bug 883749 into two bugs
https://bugzilla.mozilla.org/show_bug.cgi?id=883749 (Vobis)
https://bugzilla.mozilla.org/show_bug.cgi?id=884162 (MP3)

1. Vobis encoder:
For audio only encoding, I think we do not really need to support Vobis, at 
least for this moment. Take video encoding into account, we need vobis for 
"VP8/Vobis/WebM" video format. 

2. H.264/AAC/MP4
>From performance/ power consumption perspective, "H.264/AAC/MP4" is still the 
>best choice for B2G, for now, since HW codec is wildly supported on most 
>devices. 
In video encoder, I think the priority could be
On B2G/ Android:
"H.264/AAC/MP4" > "VP8/Vobis/WebM"/"VP9/Opus/WebM"
On all the other platform 
"VP8/Vobis/WebM"/"VP9/Opus/WebM" > "H.264/AAC/MP4"

3. mp3 or m4a, or none of them
With "H.264/AAC/MP4" supported, suppose m4a should take zero implementation 
effort. Unless we do has real mp3 user story, I think we should put mp3 at 
lowest priority of audio encoder support. Like Ralph said, we may choose to 
support mp3 after it become royalty-free format.
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