<div dir="ltr"><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Hi,</span></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"> </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">“I am

trying to generate a minimal ffmpeg build with support for just some of

audio/video decoders (like AVC, HEVC, AAC-LATM, AAC, & AC-3). In order to

do so, I am trimming down the ffmpeg dependencies via the following

representative configuration options:</span></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">./configure</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--disable-debug</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--disable-doc</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--disable-ffplay</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-shared</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-avresample</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-gpl</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libmp3lame</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libvpx</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libwebp</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libxvid</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libx264</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-nonfree</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-openssl</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libfdk_aac</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-postproc</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-small</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-version3</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libzmq</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--extra-libs=-ldl</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--prefix=</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(163,21,21)">"</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">${PREFIX}</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(163,21,21)">"</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--enable-libopenjpeg</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black">        </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:rgb(0,16,128)">--extra-libs=-lpthread</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"> </span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:blue">\</span></i><i><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas;color:black"></span></i></p>

<p class="MsoNormal" style="line-height:14.25pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:11pt"> </span><br></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">The

specific ffmpeg libraries I want to link my application against, are  “-lavcodec -lavdevice -lavfilter -lavformat -lavutil -lavresample -lm -lpthread -lswscale -lstdc++”.

However, in this configuration I observe that a call to <b><i>av_parser_init()</i></b>

fails to return a parser for any of the codec IDs like AVC or AAC. </span></p><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:11pt"><br></span></p><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:11pt">A call to </span><b style="font-size:11pt"><i>avcodec_find_decoder()</i></b><span style="font-size:11pt">

with an AVC or AAC codec ID however, seems to work fine. </span><br></p><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><br></span></p><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Is there a dependency

on any other library like <i>“freetype”</i> etc. that I need to enable in my

configuration above, in order for <i>av_parser_init</i>() to succeed?</span></p><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><br></span></p><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Thanks in advance!</span></p></div>