I know Jitsi supports many codecs, and that VOIP uses many low-bitrate codecs.
So since I´m looking for a low-bitrate solution with Java support, I´m
asking here.. in the interest that this mesage might be indexed by
search engines and that this question (and any answers I get) might
help other people in the future.
Please, before anyone complains that this has nothing to do with
Jitsi, please read up until the end... it is slightly related
So after the introduction:
1. I´m looking for some low-bitrate codec to reduce the size of some
very long (think 4-5+ hrs of voice conversation each) person-to-person
interviews, which as Windows Media Audio (WMA), 32k bitrate, mono
encoding, end up as 50 to 60 MB .wma files. My idea is to find some
command line encoder (if possible for win32) to re-compress the files,
and then use a Java based solution (an applet would be just fine) to
reproduce these low-bitrate audio files from a web page.
2. I have found several low-bitrate codecs, namely g.729, and another
open source one dubbed "Codec2". I wasn´t able to find a command line,
win32 encoder for these... much less a java player applet solution
that I can embed on web pages.
a. Codec2, at http://www.voiptoday.org/index.php?option=com_content&view=article&id=512:codec2-low-bit-rate-open-source-speech-codec-v01-alpha-released&catid=53:general&Itemid=101
and http://freetel.svn.sourceforge.net/viewvc/freetel/codec2/ still
offers only "tarballs"
b. g.729: I was able to find a command-line, win32 DECODER able to
turn g.729 back to PCM wavs... http://www.voiceage.com/media/G729.zip
However, for a win32 g.729 ENCODER... all references point to a file
that was "wav2g729.rar" and was hosted at
However, the domain "archived-mails.info" has expired and all the
content associated with it is gone. And guess what? The content was
NEVER indexed by www.archive.org
c. However, I found something about JITSI and g.729 here:
DTMF with RTP and G.729
GSoC Student: Romain Philibert - France
Primary Mentor: Lubomir Marinov - Bulgaria
Develop a JMF codec for g.729
Integrate the codec in SIP Communicator
Implement a way that would allow users to download (via http) and
install the codec after SIP Communicator has been installed
I´d like to know if this was developed, if so I´m thinking of using
this codec from my own Java command-line tool to encode other file
formats (think WAV) to g.729.
Thanks for your time, and if you feel this semi-OT discussion does not
belong here, please answer privately.
Thanks in advance.