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<p>Hey, <br>
</p>
<p>I am decoding an OGG video (theora & vorbis as codecs) and
want to show it on the screen (using Ogre 3D) while playing its
sound. I can decode the image stream just fine and the video
plays perfectly with the correct frame rate, etc.</p>
<p>However, I cannot get the sound to play at all with OpenAL. </p>
<p>Here is how I decode audio packets (in a background thread, the
equivalent works just fine for the image stream of the video
file):</p>
<pre style="" class="lang-cpp prettyprint prettyprinted"><code><span class="com">//------------------------------------------------------------------------------</span><span class="pln">
</span><span class="typ">int</span><span class="pln"> decodeAudioPacket</span><span class="pun">(</span><span class="pln"> </span><span class="typ">AVPacket</span><span class="pun">&</span><span class="pln"> p_packet</span><span class="pun">,</span><span class="pln"> </span><span class="typ">AVCodecContext</span><span class="pun">*</span><span class="pln"> p_audioCodecContext</span><span class="pun">,</span><span class="pln"> </span><span class="typ">AVFrame</span><span class="pun">*</span><span class="pln"> p_frame</span><span class="pun">,</span><span class="pln">
</span><span class="typ">FFmpegVideoPlayer</span><span class="pun">*</span><span class="pln"> p_player</span><span class="pun">,</span><span class="pln"> </span><span class="typ">VideoInfo</span><span class="pun">&</span><span class="pln"> p_videoInfo</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
</span><span class="com">// Decode audio frame</span><span class="pln">
</span><span class="typ">int</span><span class="pln"> got_frame </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln">
</span><span class="typ">int</span><span class="pln"> decoded </span><span class="pun">=</span><span class="pln"> avcodec_decode_audio4</span><span class="pun">(</span><span class="pln">p_audioCodecContext</span><span class="pun">,</span><span class="pln"> p_frame</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">got_frame</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">p_packet</span><span class="pun">);</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">decoded </span><span class="pun"><</span><span class="pln"> </span><span class="lit">0</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
p_videoInfo</span><span class="pun">.</span><span class="pln">error </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Error decoding audio frame."</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">return</span><span class="pln"> decoded</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="com">// Frame is complete, store it in audio frame queue</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">got_frame</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
</span><span class="typ">int</span><span class="pln"> bufferSize </span><span class="pun">=</span><span class="pln"> av_samples_get_buffer_size</span><span class="pun">(</span><span class="pln">NULL</span><span class="pun">,</span><span class="pln"> p_audioCodecContext</span><span class="pun">-></span><span class="pln">channels</span><span class="pun">,</span><span class="pln"> p_frame</span><span class="pun">-></span><span class="pln">nb_samples</span><span class="pun">,</span><span class="pln">
p_audioCodecContext</span><span class="pun">-></span><span class="pln">sample_fmt</span><span class="pun">,</span><span class="pln"> </span><span class="lit">0</span><span class="pun">);</span><span class="pln">
</span><span class="typ">int64_t</span><span class="pln"> duration </span><span class="pun">=</span><span class="pln"> p_frame</span><span class="pun">-></span><span class="pln">pkt_duration</span><span class="pun">;</span><span class="pln">
</span><span class="typ">int64_t</span><span class="pln"> dts </span><span class="pun">=</span><span class="pln"> p_frame</span><span class="pun">-></span><span class="pln">pkt_dts</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">staticOgreLog</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
staticOgreLog</span><span class="pun">-></span><span class="pln">logMessage</span><span class="pun">(</span><span class="str">"Audio frame bufferSize / duration / dts: "</span><span class="pln">
</span><span class="pun">+</span><span class="pln"> boost</span><span class="pun">::</span><span class="pln">lexical_cast</span><span class="pun"><</span><span class="pln">std</span><span class="pun">::</span><span class="pln">string</span><span class="pun">>(</span><span class="pln">bufferSize</span><span class="pun">)</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" / "</span><span class="pln">
</span><span class="pun">+</span><span class="pln"> boost</span><span class="pun">::</span><span class="pln">lexical_cast</span><span class="pun"><</span><span class="pln">std</span><span class="pun">::</span><span class="pln">string</span><span class="pun">>(</span><span class="pln">duration</span><span class="pun">)</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" / "</span><span class="pln">
</span><span class="pun">+</span><span class="pln"> boost</span><span class="pun">::</span><span class="pln">lexical_cast</span><span class="pun"><</span><span class="pln">std</span><span class="pun">::</span><span class="pln">string</span><span class="pun">>(</span><span class="pln">dts</span><span class="pun">),</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="pln">LML_NORMAL</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="com">// Create the audio frame</span><span class="pln">
</span><span class="typ">AudioFrame</span><span class="pun">*</span><span class="pln"> frame </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">AudioFrame</span><span class="pun">();</span><span class="pln">
frame</span><span class="pun">-></span><span class="pln">dataSize </span><span class="pun">=</span><span class="pln"> bufferSize</span><span class="pun">;</span><span class="pln">
frame</span><span class="pun">-></span><span class="pln">data </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">uint8_t</span><span class="pun">[</span><span class="pln">bufferSize</span><span class="pun">];</span><span class="pln">
memcpy</span><span class="pun">(</span><span class="pln">frame</span><span class="pun">-></span><span class="pln">data</span><span class="pun">,</span><span class="pln"> p_frame</span><span class="pun">-></span><span class="pln">data</span><span class="pun">,</span><span class="pln"> bufferSize</span><span class="pun">);</span><span class="pln">
</span><span class="kwd">double</span><span class="pln"> timeBase </span><span class="pun">=</span><span class="pln"> </span><span class="pun">((</span><span class="kwd">double</span><span class="pun">)</span><span class="pln">p_audioCodecContext</span><span class="pun">-></span><span class="pln">time_base</span><span class="pun">.</span><span class="pln">num</span><span class="pun">)</span><span class="pln"> </span><span class="pun">/</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">double</span><span class="pun">)</span><span class="pln">p_audioCodecContext</span><span class="pun">-></span><span class="pln">time_base</span><span class="pun">.</span><span class="pln">den</span><span class="pun">;</span><span class="pln">
frame</span><span class="pun">-></span><span class="pln">lifeTime </span><span class="pun">=</span><span class="pln"> duration </span><span class="pun">*</span><span class="pln"> timeBase</span><span class="pun">;</span><span class="pln">
p_player</span><span class="pun">-></span><span class="pln">addAudioFrame</span><span class="pun">(</span><span class="pln">frame</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="kwd">return</span><span class="pln"> decoded</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}
</span></code></pre>
<p>So, as you can see, I decode the frame, memcpy it to my own
struct, AudioFrame. Now, when the sound is played, I use these
audio frame like this:
</p>
<pre style="" class="lang-cpp prettyprint prettyprinted"><code><span class="com">//------------------------------------------------------------------------------</span></code><code><span class="typ">
int</span><span class="pln"> numBuffers </span><span class="pun">=</span><span class="pln"> </span><span class="lit">4</span><span class="pun">;</span><span class="pln">
</span><span class="typ">ALuint</span><span class="pln"> buffers</span><span class="pun">[</span><span class="lit">4</span><span class="pun">];</span><span class="pln">
alGenBuffers</span><span class="pun">(</span><span class="pln">numBuffers</span><span class="pun">,</span><span class="pln"> buffers</span><span class="pun">);</span><span class="pln">
</span><span class="typ">ALenum</span><span class="pln"> success </span><span class="pun">=</span><span class="pln"> alGetError</span><span class="pun">();</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">success </span><span class="pun">!=</span><span class="pln"> AL_NO_ERROR</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
CONSOLE_LOG</span><span class="pun">(</span><span class="str">"Error on alGenBuffers : "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">)</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> alGetString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">));</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="com">// Fill a number of data buffers with audio from the stream</span><span class="pln">
std</span><span class="pun">::</span><span class="typ">vector</span><span class="pun"><</span><span class="typ">AudioFrame</span><span class="pun">*></span><span class="pln"> audioBuffers</span><span class="pun">;</span><span class="pln">
std</span><span class="pun">::</span><span class="typ">vector</span><span class="pun"><</span><span class="kwd">unsigned</span><span class="pln"> </span><span class="typ">int</span><span class="pun">></span><span class="pln"> audioBufferSizes</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">unsigned</span><span class="pln"> </span><span class="typ">int</span><span class="pln"> numReturned </span><span class="pun">=</span><span class="pln"> FFMPEG_PLAYER</span><span class="pun">-></span><span class="pln">getDecodedAudioFrames</span><span class="pun">(</span><span class="pln">numBuffers</span><span class="pun">,</span><span class="pln"> audioBuffers</span><span class="pun">,</span><span class="pln"> audioBufferSizes</span><span class="pun">);</span><span class="pln">
</span><span class="com">// Assign the data buffers to the OpenAL buffers</span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">unsigned</span><span class="pln"> </span><span class="typ">int</span><span class="pln"> i </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i </span><span class="pun"><</span><span class="pln"> numReturned</span><span class="pun">;</span><span class="pln"> </span><span class="pun">++</span><span class="pln">i</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
alBufferData</span><span class="pun">(</span><span class="pln">buffers</span><span class="pun">[</span><span class="pln">i</span><span class="pun">],</span><span class="pln"> _streamingFormat</span><span class="pun">,</span><span class="pln"> audioBuffers</span><span class="pun">[</span><span class="pln">i</span><span class="pun">],</span><span class="pln"> audioBufferSizes</span><span class="pun">[</span><span class="pln">i</span><span class="pun">],</span><span class="pln"> _streamingFrequency</span><span class="pun">);</span><span class="pln">
success </span><span class="pun">=</span><span class="pln"> alGetError</span><span class="pun">();</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">success </span><span class="pun">!=</span><span class="pln"> AL_NO_ERROR</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
CONSOLE_LOG</span><span class="pun">(</span><span class="str">"Error on alBufferData : "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">)</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> alGetString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">)</span><span class="pln">
</span><span class="pun">+</span><span class="pln"> </span><span class="str">" size: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">audioBufferSizes</span><span class="pun">[</span><span class="pln">i</span><span class="pun">]));</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="com">// Queue the buffers into OpenAL</span><span class="pln">
alSourceQueueBuffers</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">,</span><span class="pln"> numReturned</span><span class="pun">,</span><span class="pln"> buffers</span><span class="pun">);</span><span class="pln">
success </span><span class="pun">=</span><span class="pln"> alGetError</span><span class="pun">();</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">success </span><span class="pun">!=</span><span class="pln"> AL_NO_ERROR</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
CONSOLE_LOG</span><span class="pun">(</span><span class="str">"Error queuing streaming buffers: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">)</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> alGetString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">));</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
alSourcePlay</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">);</span></code>
</pre>
<p>The format and frequency I give to OpenAL are
AL_FORMAT_STEREO16 (it is a stereo sound stream) and 48000
(which is the sample rate of the AVCodecContext of the audio
stream).</p>
<p>And during playback, I do the following to refill OpenAL's
buffers:
</p>
<pre style="" class="lang-cpp prettyprint prettyprinted"><code><span class="com">//------------------------------------------------------------------------------</span></code><code><span class="typ"></span></code><code><span class="typ">
ALint</span><span class="pln"> numBuffersProcessed</span><span class="pun">;</span><span class="pln">
</span><span class="com">// Check if OpenAL is done with any of the queued buffers</span><span class="pln">
alGetSourcei</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">,</span><span class="pln"> AL_BUFFERS_PROCESSED</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">numBuffersProcessed</span><span class="pun">);</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">numBuffersProcessed </span><span class="pun"><=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="com">// Fill a number of data buffers with audio from the stream</span><span class="pln">
std</span><span class="pun">::</span><span class="typ">vector</span><span class="pun"><</span><span class="typ">AudiFrame</span><span class="pun">*></span><span class="pln"> audioBuffers</span><span class="pun">;</span><span class="pln">
std</span><span class="pun">::</span><span class="typ">vector</span><span class="pun"><</span><span class="kwd">unsigned</span><span class="pln"> </span><span class="typ">int</span><span class="pun">></span><span class="pln"> audioBufferSizes</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">unsigned</span><span class="pln"> </span><span class="typ">int</span><span class="pln"> numFilled </span><span class="pun">=</span><span class="pln"> FFMPEG_PLAYER</span><span class="pun">-></span><span class="pln">getDecodedAudioFrames</span><span class="pun">(</span><span class="pln">numBuffersProcessed</span><span class="pun">,</span><span class="pln"> audioBuffers</span><span class="pun">,</span><span class="pln"> audioBufferSizes</span><span class="pun">);</span><span class="pln">
</span><span class="com">// Assign the data buffers to the OpenAL buffers</span><span class="pln">
</span><span class="typ">ALuint</span><span class="pln"> buffer</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">unsigned</span><span class="pln"> </span><span class="typ">int</span><span class="pln"> i </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i </span><span class="pun"><</span><span class="pln"> numFilled</span><span class="pun">;</span><span class="pln"> </span><span class="pun">++</span><span class="pln">i</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
</span><span class="com">// Pop the oldest queued buffer from the source, </span><span class="pln">
</span><span class="com">// fill it with the new data, then re-queue it</span><span class="pln">
alSourceUnqueueBuffers</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">,</span><span class="pln"> </span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">buffer</span><span class="pun">);</span><span class="pln">
</span><span class="typ">ALenum</span><span class="pln"> success </span><span class="pun">=</span><span class="pln"> alGetError</span><span class="pun">();</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">success </span><span class="pun">!=</span><span class="pln"> AL_NO_ERROR</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
CONSOLE_LOG</span><span class="pun">(</span><span class="str">"Error Unqueuing streaming buffers: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">));</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
alBufferData</span><span class="pun">(</span><span class="pln">buffer</span><span class="pun">,</span><span class="pln"> _streamingFormat</span><span class="pun">,</span><span class="pln"> audioBuffers</span><span class="pun">[</span><span class="pln">i</span><span class="pun">],</span><span class="pln"> audioBufferSizes</span><span class="pun">[</span><span class="pln">i</span><span class="pun">],</span><span class="pln"> _streamingFrequency</span><span class="pun">);</span><span class="pln">
success </span><span class="pun">=</span><span class="pln"> alGetError</span><span class="pun">();</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">success </span><span class="pun">!=</span><span class="pln"> AL_NO_ERROR</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
CONSOLE_LOG</span><span class="pun">(</span><span class="str">"Error on re- alBufferData: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">));</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
alSourceQueueBuffers</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">,</span><span class="pln"> </span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">buffer</span><span class="pun">);</span><span class="pln">
success </span><span class="pun">=</span><span class="pln"> alGetError</span><span class="pun">();</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">success </span><span class="pun">!=</span><span class="pln"> AL_NO_ERROR</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
CONSOLE_LOG</span><span class="pun">(</span><span class="str">"Error re-queuing streaming buffers: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="typ">Ogre</span><span class="pun">::</span><span class="typ">StringConverter</span><span class="pun">::</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">)</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" "</span><span class="pln">
</span><span class="pun">+</span><span class="pln"> alGetString</span><span class="pun">(</span><span class="pln">success</span><span class="pun">));</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="com">// Make sure the source is still playing, </span><span class="pln">
</span><span class="com">// and restart it if needed.</span><span class="pln">
</span><span class="typ">ALint</span><span class="pln"> playStatus</span><span class="pun">;</span><span class="pln">
alGetSourcei</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">,</span><span class="pln"> AL_SOURCE_STATE</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">playStatus</span><span class="pun">);</span><span class="pln">
</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">playStatus </span><span class="pun">!=</span><span class="pln"> AL_PLAYING</span><span class="pun">)</span><span class="pln">
alSourcePlay</span><span class="pun">(</span><span class="pln">_source</span><span class="pun">);</span></code>
</pre>
<p>As you can see, I do quite heavy error checking. But I do not
get any errors. But the only thing that plays is a constant
clicking noise. </p>
<p>The video itself is not broken, it can be played fine on any
player. OpenAL can also play *.way files just fine in the same
application, so it is also working.</p>
<p>Any ideas what could be wrong here or how to do this correctly?</p>
<p>My only guess is that somehow, FFmpeg's decode function does
not produce data OpenGL can read. But this is as far as the
FFmpeg decode example goes, so I don't know what's missing. As I
understand it, the decode_audio4 function decodes the frame to
raw data. And OpenAL should be able to work with RAW data (or
rather, doesn't work with anything else).</p>
</div>
<br>
P.S: You can also find this question on StackOverflow, figured it
wouldn't hurt to ask on multiple places:<br>
<a class="moz-txt-link-freetext" href="http://stackoverflow.com/questions/21386135/ffmpeg-openal-playback-streaming-sound-from-video-wont-work">http://stackoverflow.com/questions/21386135/ffmpeg-openal-playback-streaming-sound-from-video-wont-work</a><br>
<br>
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