How to convert wma to ogg

How can I convert all *.wma to *.ogg in one directory?
I first tried the approved ffmeg. That one helped me many times with good results.

Version 1:

find -name '*wma' -exec ffmpeg -i {} -acodec vorbis -ab 128k {}.ogg \;
rename 's/\.wma//' *\.wma\.ogg
(Test the renameing: rename --no-act --verbose 's/\.wma//' *\.wma\.ogg)

or

Version 2:

for i in *.wma; do ffmpeg -i "$i" -vn -acodec vorbis -ab 128k "${i/.wma}".ogg; done

# ffmpeg: -vn => novideo, -acodec vorbis => ogg-encoder, -ab set audio bitrate to 128k (64 is standard. That option doesn't seem to work with ogg :-(
# ${i/.wma} is cutting the filename $i from ".wma"

The quality gets really worse.

Best quality with version 3:

1. Step: Convert wma to flac with ffmeg

ffmpeg -i input.wma -vn -acodec flac output.flac

2. Step: Convert flac to ogg with oggenc

oggenc input.flac -q2 -o output.ogg

# -q quality 2 (1 bad .. 10 excellent)
# -o output-file

Or all in one line to convert the whole directory:

for i in *.wma; do ffmpeg -i "$i" -vn -acodec flac -y tmp.flac; oggenc tmp.flac -q2 -o "${i/.wma}".ogg; done; rm -f tmp.flac

# -y Overwrite output files.
# rm -f delete without further questions