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copied!<p>First of all have a look at this <a href="https://trac.ffmpeg.org/wiki/GuidelinesHighQualityAudio" rel="nofollow">document:</a></p> <p>Dolby Digital: ac3</p> <p>Dolby Digital Plus: eac3</p> <p>MP2: libtwolame, mp2</p> <p>Windows Media Audio 1: wmav1</p> <p>Windows Media Audio 2: wmav2</p> <p>LC-AAC: libfdk_aac, libfaac, aac, libvo_aacenc</p> <p><strong>HE-AAC: libfdk_aac, libaacplus</strong></p> <p>Vorbis: libvorbis, vorbis</p> <p>MP3: libmp3lame, libshine</p> <p>Opus: libopus</p> <p>from the above reading it will be clear to you that in order to encode audio in HE-AAC/ HE-AAC-V2 you have to use libfdk_aac or libaacplus.</p> <p>I will explain how you can do it using libfdk_aac:</p> <p>first make sure you configure ffmpeg along with following options:</p> <p>--enable-libfdk_aac --enable-nonfree</p> <p>now build ffmpeg and try to run the following command and see if it works:</p> <p>$ ffmpeg -i -vcodec copy -acodec libfdk_aac -profile:a aac_he </p> <p>if this works it means libav is linked with libfdk_aac.</p> <p>now in order to use it in the code:</p> <p>open the encoder using the following instructions:</p> <pre><code>AVCodecContext *encoder_ctx; encoder_ctx->codec_id = AV_CODEC_ID_AAC; encoder_ctx->sample_fmt = AV_SAMPLE_FMT_S16; encoder_ctx->profile = FF_PROFILE_AAC_HE; encoder = avcodec_find_encoder_by_name("libfdk_aac"); // if you still try to open it using avcodec_find_encoder it will open libfaac only. avcodec_open2(encoder_ctx, encoder, NULL); </code></pre> <p>Here we go, you have libfdk_aac encoder open ! The profiles which you can use are as given in this <a href="http://ffmpeg.org/doxygen/trunk/libfdk-aacenc_8c_source.html" rel="nofollow">source</a></p>

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