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POaac-eld decoding in Linux
 

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    <p>I was in Vietnam and tried to learn Vietnamese.</p> <p>The difficult thing is to learn the pronunciation and I made an Android App to record voices. Vietnamese people are very nice and I collected more than 500 sound files.</p> <p>Now I'm trying to make a language learning app. To do that I try to reduce noise and normalize volume.</p> <p>I have chosen the following settings:</p> <pre><code>this.recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); this.recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC_ELD); this.recorder.setAudioEncodingBitRate(96000); this.recorder.setAudioSamplingRate(44100); </code></pre> <p>(cordova AudioPlayer.java - default settings are crap)</p> <p>Now I have a problem. I'm not able to open the files with Audacity or FFmpeg.</p> <pre><code>./ffmpeg -i /tmp/speaker__ualp__x%E1%BA%A5u.mp4 /tmp/uu.wav ffmpeg version 1.1.2 Copyright (c) 2000-2013 the FFmpeg developers built on Feb 20 2013 10:50:54 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration: --enable-libfdk-aac libavutil 52. 13.100 / 52. 13.100 libavcodec 54. 86.100 / 54. 86.100 libavformat 54. 59.106 / 54. 59.106 libavdevice 54. 3.102 / 54. 3.102 libavfilter 3. 32.100 / 3. 32.100 libswscale 2. 1.103 / 2. 1.103 libswresample 0. 17.102 / 0. 17.102 [aac @ 0xaada980] Audio object type 39 is not supported. Last message repeated 1 times Guessed Channel Layout for Input Stream #0.0 : mono Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/speaker__ualp__x%E1%BA%A5u.mp4': Metadata: major_brand : isom minor_version : 0 compatible_brands: isom3gp4 creation_time : 2013-01-29 15:53:11 Duration: 00:00:01.21, start: 0.000000, bitrate: 116 kb/s Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s Metadata: creation_time : 2013-01-29 15:53:11 handler_name : SoundHandle [aac @ 0xaada980] Audio object type 39 is not supported. Output #0, wav, to '/tmp/uu.wav': Metadata: major_brand : isom minor_version : 0 compatible_brands: isom3gp4 Stream #0:0(eng): Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s Metadata: creation_time : 2013-01-29 15:53:11 handler_name : SoundHandle Stream mapping: Stream #0:0 -&gt; #0:0 (aac -&gt; pcm_s16le) Error while opening decoder for input stream #0:0 </code></pre> <p>What can I do?</p>
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    1. COHere an example soundfile: http://datenkueche.com/viet/sounds/audio.mp4
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    2. COI am able to playback audio.mp4 from audacity - checkout mediainfo which probes a file and displays format related info
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    3. CODo you use audacity on Linux? Mediainfo shows: Format : ER AAC ELD Format/Info : Advanced Audio Codec Codec ID : 40 Bit rate mode : Constant Bit rate : 96.0 Kbps Channel(s) : 1 channel Channel positions : Front: C Sampling rate : 44.1 KHz Compression mode : Lossy Stream size : 29.4 KiB (91%)
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