[FFmpeg-devel] Bug with ffmpeg? Clipping/poor audio in converted sound (Nellymoser to MP3)

Mel Brand bighype
Tue Mar 4 05:24:01 CET 2008

Hi all,

I've run into some issues with ffmpeg clipping audio when converting
from Nellymoser flv file.

I have the audio files here so you can test (audio recorded by my
husband with Red5 through his laptop's mic):


I'm using the latest ffmpeg, compiled from svn along with libmp3lame.

Command I used is this:

ffmpeg -i nellymoser-test.flv -acodec libmp3lame ffmpeg-test.mp3

Take a listen please... why does MP3 sound so much worse? Is there
anything i can do to improve the conversion process?

Thank you!


PS: Complete output of the command:
$ ffmpeg -i nick-03-02-2008.flv -acodec libmp3lame nick-ffmpeg.mp3
FFmpeg version SVN-r12310, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-liba52
--disable-debug --enable-libmp3lame --enable-libfaad --enable-libfaac
--enable-pthreads --disable-vhook
  libavutil version: 49.6.0
  libavcodec version: 51.50.1
  libavformat version: 52.7.0
  libavdevice version: 52.0.0
  built on Mar  4 2008 03:44:41, gcc: 4.1.3 20070929 (prerelease)
(Ubuntu 4.1.2-16ubuntu2)
[flv @ 0x78b620]Unsupported audio codec (ffffffff)
[flv @ 0x78b620]Unsupported video codec (ffffffff)
[flv @ 0x78b620]Could not find codec parameters (Video: 0xffffffff)
Input #0, flv, from 'nick-03-02-2008.flv':
  Duration: 00:00:00.0, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: 0xffffffff, 1000.00 tb(r)
    Stream #0.1: Audio: nellymoser, 8000 Hz, mono
File 'nick-ffmpeg.mp3' already exists. Overwrite ? [y/N] y
Output #0, mp3, to 'nick-ffmpeg.mp3':
    Stream #0.0: Audio: libmp3lame, 8000 Hz, mono, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
Press [q] to stop encoding
size=      34kB time=4.3 bitrate=  64.1kbits/s
video:0kB audio:34kB global headers:0kB muxing overhead 0.089699%

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