Why is my ogg bigger than my m4a?

Posted by acidzombie24 on Super User See other posts from Super User or by acidzombie24
Published on 2010-03-25T20:03:35Z Indexed on 2010/03/25 20:23 UTC
Read the original article Hit count: 404

Filed under:

vorbis

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ogg

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m4a

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codec

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ffmpeg

I am using the following commands to encode an audio file to m4a & ogg formats:

ffmpeg.exe -i 0123456789 -ab 192k out.m4a
ffmpeg.exe -i 0123456789 -f wav - | oggenc2.exe - -r -q 6 -o out.ogg

(0123456789 has no extension.)

My m4a output is 14,608kB while my ogg output is 19,809kB.

Why? AFAIK -q 6 is roughly 192kbps. So it should be about even. I could see one file being 1-3MB bigger than the other, but 5MB is pretty large. The m4a is almost 75% of the ogg! Why is this?

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