Re: AAC Constant Bit Rate coding ("John O'Connell" )


Subject: Re: AAC Constant Bit Rate coding
From:    "John O'Connell"  <johngerardoconnell@xxxxxxxx>
Date:    Tue, 15 Nov 2011 16:44:25 +0100
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

--bcaec5016151a8172b04b1c7dccb Content-Type: text/plain; charset=UTF-8 Hi, You could try ffmpeg: www.ffmpeg.org Open source and handles pretty much anything you throw at it. This line should convert a wav to aac. ffmpeg -i file.wav -ab 128k -acodec libfaac test.mp4 It seems to ignore the audio bit-rate flag though (-ab 128k) - perhaps for reasons mentioned previously This is what I get inside test.mp4: Audio: aac, 44100 Hz, stereo, s16, 141 kb/s Cheers, John 2011/11/15 Warren Bakay <warren@xxxxxxxx> > I use xld to encode to aac. It uses core audio to do the encoding. > > > On Tue, Nov 15, 2011 at 1:07 PM, fabien gouyon <fgouyon@xxxxxxxx>wrote: > >> Dear list, >> >> Could somebody recommend a free software, or even better some >> open-source code, for converting audio from WAV to AAC with *constant* >> bit rate (and not variable bit rate). >> >> Any help would be much appreciated. >> Best, >> >> -- >> Fabien Gouyon, PhD >> Senior Research Scientist, INESC Porto >> Invited Assistant Professor, Engineering Faculty, University of Porto >> http://www.inescporto.pt/~fgouyon >> http://smc.inescporto.pt/ >> >> > --bcaec5016151a8172b04b1c7dccb Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi,<br><br>You could try ffmpeg: <a href=3D"http://www.ffmpeg.org">www.ffmp= eg.org</a><br><br>Open source and handles pretty much anything you throw at= it.<br><br>This line should convert a wav to aac. <br><br>ffmpeg -i file.w= av -ab 128k -acodec libfaac test.mp4<br> <br>It seems to ignore the audio bit-rate flag though (-ab 128k) - perhaps = for reasons mentioned previously <br><br>This is what I get inside test.mp4= : Audio: aac, 44100 Hz, stereo, s16, 141 kb/s<br><br>Cheers,<br><br>John<br= > <br><div class=3D"gmail_quote">2011/11/15 Warren Bakay <span dir=3D"ltr">&l= t;<a href=3D"mailto:warren@xxxxxxxx">warren@xxxxxxxx</a>&gt;</span><br><blo= ckquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c= cc solid;padding-left:1ex;"> I use xld to encode to aac. It uses core audio to do the encoding.<div clas= s=3D"HOEnZb"><div class=3D"h5"><br><br><div class=3D"gmail_quote">On Tue, N= ov 15, 2011 at 1:07 PM, fabien gouyon <span dir=3D"ltr">&lt;<a href=3D"mail= to:fgouyon@xxxxxxxx" target=3D"_blank">fgouyon@xxxxxxxx</a>&gt;</= span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex">Dear list,<br> <br> Could somebody recommend a free software, or even better some<br> open-source code, for converting audio from WAV to AAC with *constant*<br> bit rate (and not variable bit rate).<br> <br> Any help would be much appreciated.<br> Best,<br> <font color=3D"#888888"><br> --<br> Fabien Gouyon, PhD<br> Senior Research Scientist, INESC Porto<br> Invited Assistant Professor, Engineering Faculty, University of Porto<br> <a href=3D"http://www.inescporto.pt/%7Efgouyon" target=3D"_blank">http://ww= w.inescporto.pt/~fgouyon</a><br> <a href=3D"http://smc.inescporto.pt/" target=3D"_blank">http://smc.inescpor= to.pt/</a><br> <br> </font></blockquote></div><br> </div></div></blockquote></div><br> --bcaec5016151a8172b04b1c7dccb--


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