I have googled this but not getting a clear answer. As far as i understand FLV container format currently support the following audio formats MP3, ADPCM, Linear
sequencefile
textdocumentproxy
logstash-configuration
azure-migrate
rotational-matrices
numbers
sql-server-job
type-variables
nsprintoperation
couchdb-futon
mongodb-atlas-search
libavcodec
android-resources
batch-request
postgresql-performance
large-title
nike
cvi
regex-replace
custom-widgets
chomsky-normal-form
xargs
amazon-policy
warc
throttling
tumblr-themes
solid-state-drive
kannada
floating
api-security