ffmpeg mp3 conversion

was to convert several thousand MP3 files, and get this for some files: ffmpeg -t 45 -i "my_mp3.mp3" -y "new_mp3.mp3"

FFmpeg version 0.5-svn17737+3:0.svn20090303-开发者_JAVA技巧1ubuntu6, Copyright (c) 2000-2009 Fabrice Bellard, et al.

configuration: --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --extra-version=svn17737+3:0.svn20090303-1ubuntu6 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --disable-stripping --disable-vhook --enable-libdc1394 --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-armvfp --disable-neon --disable-altivec --disable-vis --enable-shared --disable-static libavutil 49.15. 0 / 49.15. 0

libavcodec 52.20. 0 / 52.20. 0

libavformat 52.31. 0 / 52.31. 0

libavdevice 52. 1. 0 / 52. 1. 0

libavfilter 0. 4. 0 / 0. 4. 0

libswscale 0. 7. 1 / 0. 7. 1

libpostproc 51. 2. 0 / 51. 2. 0

built on Apr 10 2009 23:18:41, gcc: 4.3.3

my_mp3.mp3: could not find codec parameters

what could be the problem?

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problem was solved with adding -f mp3

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Sounds that there are some files, which are not actually MP3 files, but just have the extension, and that they are not actually audio files or use a codec not understood by ffmpg.

Have you checked the files in question?