Carl Eugen Hoyos <[email protected]> added the comment:

(You probably need a non-buggy version of lame.)

ffmpeg -i audio-only-speex.flv -vn -ar 44100 test.swf
FFmpeg version SVN-r19519, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --cc=/opt/intel/cce/10.1.023/bin/icc --cpu=core2 --enable-gpl
--extra-cflags=-parallel --extra-ldflags=-parallel --enable-postproc
--enable-avfilter --enable-pthreads --enable-nonfree --enable-version3
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libdirac
--enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame
--extra-cflags='-I/usr/include/openjpeg -I/usr/include/gsm' --enable-libopenjpeg
--enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libx264 --enable-libxvid
  libavutil     50. 3. 0 / 50. 3. 0
  libavcodec    52.32. 0 / 52.32. 0
  libavformat   52.36. 0 / 52.36. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    0. 5. 0 /  0. 5. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Jul 27 2009 20:55:46, gcc: Intel(R) C++ gcc 4.3 mode
[flv @ 0x1369d20]Could not find codec parameters (Video: 0x0000)
Input #0, flv, from 'audio-only-speex.flv':
  Duration: 00:00:03.05, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: libspeex, 16000 Hz, 1 channels, s16
Output #0, swf, to 'test.swf':
    Stream #0.0: Audio: libmp3lame, 44100 Hz, 1 channels, s16, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
Press [q] to stop encoding
size=      26kB time=3.11 bitrate=  67.8kbits/s
video:0kB audio:24kB global headers:0kB muxing overhead 5.862956%

ffmpeg -i audio-only-nellymoser.flv -vn test.swf
FFmpeg version SVN-r19519, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --cc=/opt/intel/cce/10.1.023/bin/icc --cpu=core2 --enable-gpl
--extra-cflags=-parallel --extra-ldflags=-parallel --enable-postproc
--enable-avfilter --enable-pthreads --enable-nonfree --enable-version3
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libdirac
--enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame
--extra-cflags='-I/usr/include/openjpeg -I/usr/include/gsm' --enable-libopenjpeg
--enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libx264 --enable-libxvid
  libavutil     50. 3. 0 / 50. 3. 0
  libavcodec    52.32. 0 / 52.32. 0
  libavformat   52.36. 0 / 52.36. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    0. 5. 0 /  0. 5. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Jul 27 2009 20:55:46, gcc: Intel(R) C++ gcc 4.3 mode
[flv @ 0x1369d20]Could not find codec parameters (Video: 0x0000)
Input #0, flv, from 'audio-only-nellymoser.flv':
  Duration: 00:00:04.96, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: nellymoser, 22050 Hz, 1 channels, s16
Output #0, swf, to 'test.swf':
    Stream #0.0: Audio: libmp3lame, 22050 Hz, 1 channels, s16, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
Press [q] to stop encoding
size=      42kB time=5.07 bitrate=  67.7kbits/s
video:0kB audio:40kB global headers:0kB muxing overhead 5.816191%

----------
status: new -> closed
substatus: new -> works_for_me

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