Re: which package in etch can convert high-quality mp3 to low quality mp3?
On Mon, Apr 13, 2009 at 08:18:51 +1000, Adrian Levi (adrian.levi@gmail.com) wrote:
> 2009/4/13 Long Wind <longwind2009@gmail.com>:
> > Thank Bob, but your command does not work.
> >
> > Below is output of your command:
>
> > Output #0, mp2, to 'real128.mp3':
> > Stream #0.0: Audio: mp2, 48000 Hz, stereo, 128000 kb/s
> > Stream mapping:
> > Stream #0.0 -> #0.0
> > [mp2 @ 0xb7ec5f08]bitrate 128000 is not allowed in mp2
> > Error while opening codec for output stream #0.0 - maybe incorrect
> > parameters such as bit_rate, rate, width or height
>
> Perhaps look for a switch in the man page to force output to mp3
> rather than mp2?
Indeed. Note the '--enable-libmp3lame' below:
$ ffmpeg -ab 128000 -i testfile-320kbps.mp3 testfile-128kbps.mp3
FFmpeg version SVN-r18242, Copyright (c) 2000-2009 Fabrice Bellard, et
al.
configuration: --prefix=/usr --extra-cflags=-Wall -g -fPIC -DPIC
--cc=ccache cc --libdir=${prefix}/lib --shlibdir=${prefix}/lib
--bindir=${prefix}/bin --incdir=${prefix}/include/ffmpeg --enable-shared
--enable-libmp3lame --enable-gpl --enable-libfaad
--mandir=${prefix}/share/man --enable-libvorbis --enable-pthreads
--enable-libfaac --enable-libxvid --enable-postproc --enable-libamr-nb
--enable-libamr-wb --enable-x11grab --enable-libgsm --enable-libx264
--enable-libtheora --enable-libdc1394 --enable-nonfree
--disable-stripping --enable-avfilter --enable-libdirac
--disable-decoder=libdirac --enable-libschroedinger
--disable-encoder=libschroedinger --enable-libspeex
--enable-avfilter-lavf --disable-mmx --disable-altivec --disable-armv5te
--disable-armv6 --disable-vis
libavutil 50. 2. 0 / 50. 2. 0
libavcodec 52.22. 3 / 52.22. 3
libavformat 52.32. 0 / 52.32. 0
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 5. 0 / 0. 5. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Mar 30 2009 10:47:04, gcc: 4.3.3
Input #0, mp3, from 'testfile-320kbps.mp3':
Duration: 00:00:39.49, start: 0.000000, bitrate: 320 kb/s
Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 320 kb/s
Output #0, mp3, to 'testfile-128kbps.mp3':
Stream #0.0: Audio: libmp3lame, 44100 Hz, stereo, s16, 128 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
size= 618kB time=39.55 bitrate= 128.0kbits/s
video:0kB audio:618kB global headers:0kB muxing overhead 0.005057%
$ ls -la | grep testfile
-rw-r--r-- 1 bob bob 632822 2009-04-13 10:00 testfile-128kbps.mp3
-rw-r--r-- 1 bob bob 1580929 2009-04-13 09:59 testfile-320kbps.mp3
BUT - as noted elsewhere in this thread, simply using the 'lame' command
is easier. I have just tried:
lame testfile-320kbps.mp3 testfile-128kbps.mp3
and it worked exactly the same (but was a bit quicker).
--
Bob Cox. Stoke Gifford, near Bristol, UK.
Please reply to the list only. Do NOT send copies directly to me.
Debian on the NSLU2: http://bobcox.com/slug/
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