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    <p>You must set some additional settings for <code>AVCodecContext</code> before you call <code>avcodec_open2</code>.</p> <p>I usually set these required settings (variables beginning with 'k' mean predefined constatns):</p> <pre><code>avCtx-&gt;strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; avCtx-&gt;codec_type = AVMEDIA_TYPE_AUDIO; avCtx-&gt;channels = kChannelsCount; // for example, 2 avCtx-&gt;sample_fmt = kSampleFmt; // AV_SAMPLE_FMT_S16 avCtx-&gt;sample_rate = kSampleRate; // 44100 avCtx-&gt;channel_layout = kSampleLayout; // 3 const AVRational timeBase = {1, avCtx-&gt;sample_rate}; avCtx-&gt;time_base = timeBase; </code></pre> <p><strong>UPD</strong></p> <p>I'm sorry, I wrote the parameters that must be set for audio <em>encoding</em>. For audio decoding usually sufficient to set <code>avCtx-&gt;channels</code>, <code>ctx-&gt;sample_rate</code> or set <code>avCtx-&gt;extrdata</code> and <code>avCtx-&gt;extradata_size</code>.</p> <p>To find the cause of the error, try to see the ffmpeg output. If on the device is difficult to do, you can redirect the ffmpeg output and perform logging by own callback. Example:</p> <pre><code> // initialize: ::av_log_set_callback(&amp;my_ffmpeg_log); // callback void my_ffmpeg_log(void *ptr, int level, const char *fmt, va_list vl) { /// Here you can set a more detailed level if (level &lt; AV_LOG_VERBOSE) { static char message[8192]; const char *module = NULL; if (ptr) { AVClass *avc = *(AVClass**) ptr; if (avc-&gt;item_name) module = avc-&gt;item_name(ptr); } vsnprintf(message, sizeof message, fmt, vl); // you can set own function here, for example LOGI, as you have in your example std::cout &lt;&lt; "ffmpeg message : " &lt;&lt; module &lt;&lt; " " &lt;&lt; level &lt;&lt; " " &lt;&lt; message; } } </code></pre>
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    1. PODecode AAC to PCM with ffmpeg on android
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    1. COThanks for the info. I tried this, but I get the same error :( Do you have any other suggestions?
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    2. COSee update to my answer
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    3. COThanks for the code to get the logs out - the only log is an error "channel element 0.0 not allocated". Unfortunately setting the attribs you mentioned doesn't help. The aac I'm decoding is in a m4a container (which shouldn't matter). The ffmpeg docs say that extradata can contain the global headers, but they can also be in the bytestream, which they are :(
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