Unable to convert .mp3 to .m4a using ffmpeg -

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i aware legal constraints in using libfaac testing purpose.

i have compiled ffmpeg faac enabled. when tried convert .mp3 .m4a here error getting. please provide resolution problem. tried on 2 different sources of .mp3, still getting same error.

[user@ip-10-161-13-26 ~]$ ffmpeg  -i kalimba.mp3 -c:a libfaac kalimba.m4a ffmpeg version 0.11.1 copyright (c) 2000-2012 ffmpeg developers   built on may  4 2013 09:33:27 gcc 4.4.6 20120305 (red hat 4.4.6-4)   configuration: --enable-libfaac --enable-nonfree --disable-yasm   libavutil      51. 54.100 / 51. 54.100   libavcodec     54. 23.100 / 54. 23.100   libavformat    54.  6.100 / 54.  6.100   libavdevice    54.  0.100 / 54.  0.100   libavfilter     2. 77.100 /  2. 77.100   libswscale      2.  1.100 /  2.  1.100   libswresample   0. 15.100 /  0. 15.100 [mp3 @ 0x2464680] header missing [mp3 @ 0x2463100] max_analyze_duration 5000000 reached @ 5015510 [mp3 @ 0x2463100] estimating duration bitrate, may inaccurate input #0, mp3, 'kalimba.mp3':   metadata:     publisher       : ninja tune     track           : 1     album           : ninja tuna     artist          : mr. scruff     album_artist    : mr. scruff     title           : kalimba     genre           : electronic     composer        : a. carthy , a. kingslow     date            : 2008   duration: 00:05:50.60, start: 0.000000, bitrate: 191 kb/s     stream #0:0: audio: mp3, 44100 hz, stereo, s16, 192 kb/s     stream #0:1: video: mjpeg, yuvj420p, 512x512, 90k tbr, 90k tbn, 90k tbc     metadata:       title           : thumbnail       comment         : cover (front) output #0, ipod, 'kalimba.m4a':   metadata:     publisher       : ninja tune     track           : 1     album           : ninja tuna     artist          : mr. scruff     album_artist    : mr. scruff     title           : kalimba     genre           : electronic     composer        : a. carthy , a. kingslow     date            : 2008     stream #0:0: video: none, q=2-31, 128 kb/s, 90k tbn     metadata:       title           : thumbnail       comment         : cover (front)     stream #0:1: audio: none, 0 channels, 128 kb/s stream mapping:   stream #0:1 -> #0:0 (mjpeg -> ?)   stream #0:0 -> #0:1 (mp3 -> libfaac) encoder (codec none) not found output stream #0:0

mp3 file @ http://db.tt/htpebpfu

also while using faac independently weird error file. 

freeware advanced audio coder faac 1.28  couldn't open input file sample.mp3

the problem input contains album artwork, ffmpeg parses video.

stream #0:0: audio: mp3, 44100 hz, stereo, s16, 192 kb/s stream #0:1: video: mjpeg, yuvj420p, 512x512, 90k tbr, 90k tbn, 90k tbc

it tries convert video, doesn't find valid output codec mpeg-4 format (m4a name). because compiled ffmpeg without libx264, ffmpeg needs in case, doesn't have native h.264 encoder.

anyway, need prevent trying convert artwork/video. add -vn options:

ffmpeg  -i kalimba.mp3 -c:a libfaac -vn kalimba.m4a

some tips:

  • with faac should use -q:a option control vbr quality – values range 10 500, 100 default.
  • in ffmpeg, best quality aac encoder libfdk_aac, followed libfaac. don't know licensing here, it's worth try well. see aac encoding guide more info.
  • encoding .aac works because output format cannot contain video, ffmpeg won't try convert video/artwork stream in first place.

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