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.
-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?