[FFmpeg-trac] #321(undetermined:new): Ffmpeg fails to detect format of piped input on some mp3 files

[FFmpeg]

#321: Ffmpeg fails to detect format of piped input on some mp3 files
--------------------------+--------------------------
 Reporter:  gwg           |        Type:  defect
   Status:  new           |    Priority:  normal
Component:  undetermined  |     Version:  unspecified
 Keywords:                |  Blocked By:
 Blocking:                |  Reproduced:  0
 Analyzed:  0             |
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 I am trying to decode an mp3 to raw wav data over a pipe. Ffmpeg reported
 being unable to detect the format of the input file, and did not transcode
 it (there was no output to the output file).

 Here is the command:

 > cat badmp3file.mp3 | ffmpeg -v 10 -i - output.wav

 And ffmpeg said:


 >FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.1, Copyright (c) 2000-2009
 Fabrice Bellard, et al.
 >  configuration: --extra-version=4:0.5.1-1ubuntu1.1 --prefix=/usr
 --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
 --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-
 libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-
 stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl
 --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
 --enable-shared --disable-static
 >  libavutil     49.15. 0 / 49.15. 0
 >  libavcodec    52.20. 1 / 52.20. 1
 >  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 Mar 31 2011 18:59:37, gcc: 4.4.3
 >pipe:: Unknown format

 However, with the following command, ffmepg is successful:

 > ffmpeg -v 9 -i badmp3file.mp3 outfile.wav

 I will submit badmp3file.mp3 to the ftp server in the folder "gwg".

 Thank you for your work!

 Garth

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/321>
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