[MPlayer-users] No MP3 encoder in LAVC??

[Giacomo Comes]

On Thu, Nov 17, 2005 at 10:25:08PM -0500, The Wanderer wrote:
> I could have sworn that this was not the case just a week or two ago,
> and possibly even just yesterday evening before the power flicker and
> resulting computer reboot, but currently I get the following behaviour
> (with any input file I've tried - this is a much stripped-down version
> of the option set I initially saw the problem with):
> 
> ==
> mencoder /home/pub/video/Music\ Videos/Indifferent\ Productions\ -\ 
> Stop\ The\ Rock\?.avi -o /dev/null -oac lavc -ovc copy -lavcopts acodec=mp3
> MEncoder dev-CVS-051117-01:54-3.3.5 (C) 2000-2005 MPlayer Team
> CPU: Advanced Micro Devices Sempron/Athlon MP/XP Thoroughbred; Duron 
> Applebred (Family: 6, Stepping: 0)
> CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
> Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE
> 
> success: format: 0  data: 0x0 - 0x392e000
> AVI file format detected.
> VIDEO:  [DIVX]  480x352  24bpp  29.970 fps  1993.2 kbps (243.3 kbyte/s)
> [V] filefmt:3  fourcc:0x58564944  size:480x352  fps:29.97  ftime:=0.0334
> ==========================================================================
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> AUDIO: 44100 Hz, 2 ch, s16le, 160.0 kbit/11.34% (ratio: 20000->176400)
> Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
> ==========================================================================
> videocodec: framecopy (480x352 24bpp fourcc=58564944)
> Building audio filter chain for 44100Hz/2ch/s16le -> 0Hz/0ch/??...
> Audio LAVC, couldn't find encoder for codec mp3
> 
> Exiting...
> ==
> 
> (Verbose output not provided because it doesn't appear to produce any
> more messages from libavcodec, which is where the problem would be.)
> 
> configure.log does in fact report successful detection of libavcodec, so
> that isn't the problem. -ac ffmp3 works just fine for audio decoding, so
> there is some form of libavcodec-based MP3 support in there. 'ffmpeg
> -formats' from a CVS updated pretty much the same time reports 'mp3' as
> one of the recognized codecs, and the same copy of ffmpeg is capable of
> encoding MP3 audio, so my system does have everything necessary for
> libavcodec to do MP3 encoding.
> 
> 'mp3' is listed as one of the valid arguments to '-lavcopts acodec' in
> the man page; I've tried 'mp2', which is also listed and is the default,
> and that does not produce this problem.
> 
> Any clue what's going on, or where I could look to find out more?

libavcodec does not include a native mp3 encoder. It needs lame installed.
Do you have lame (or lame-devel) installed?

Giacomo