Unexpected behavior of lame encoding plugin

[Benjamin Delagoutte]

I compared different mp3 encoding methods, and figured out that mp3 files encoded with gst-lame and with lame using the same settings match different file sizes.

-rw-r--r-- 1 bdelagoutte bdelagoutte 6,6M 2007-11-26 17:59 the_sea_gst.mp3 -> produced with gstreamer
-rw-r--r-- 1 bdelagoutte bdelagoutte 9,9M 2007-11-26 17:59 the_sea_lame.mp3 -> produced with lame
-rw-r--r-- 1 bdelagoutte bdelagoutte 59M 2007-11-26 17:40 the_sea.wav -> original wav file

Step to reproduce :
1. Rip a CD track into one wav file foo.wav
2. Encode this file into mp3 using gstreamer-lame
$ gst-launch-0.10 filesrc location=foo.wav ! wavparse ! audioconvert ! lame preset=1002 ! filesink location=foo_gst.mp3
3. Encode this file into mp3 using command line lame
$ lame --preset extreme foo.wav foo_lame.mp3
4. Compare file size of foo_lame.mp3 and foo_gst.mp3

Note: this behavior can be reproduce with others presets (standard / 1001) and with normal switches as well (-V0 --vbr-new / vbr=4 vbr-quality=0)

[Benjamin Delagoutte (benjamin-delagoutte)]

$ dpkg -l gstreamer0.10-plugins-ugly-multiverse
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Nom Version Description
+++-=============================-=============================-==========================================================================
ii gstreamer0.10-plugins-ugly-mu 0.10.6-0ubuntu1 GStreamer plugins from the "ugly" set (Multiverse Variant)

Using up-to-date Gutsy.

[Eddy Pronk (epronk)]

I noticed the same from python-gst. I played the mp3 with with xmms and noticed the bitrate never jumps to 224kbps or higher)

from python:
encoder = gst.element_factory_make('lame', 'mp3-encoder')
encoder.set_property('preset', 1001) # standard

[Eddy Pronk (epronk)]

see http://bugzilla.gnome.org/show_bug.cgi?id=498004

[Daniel T Chen (crimsun)]

Is this symptom still reproducible in 8.10?

[Onkar Shinde (onkarshinde)]

The fix from upstream is included in 0.10.12 version, which is available in karmic.