Data: Note third-party codecs in AppImage FFmpeg

data/resources/thirdparty.html

@@ -1559,7 +1559,22 @@ DEALINGS IN THE SOFTWARE.</pre>
 <h3>FFmpeg - https://www.ffmpeg.org/</h3>
 <p>
     Build instructions for distributed FFmpeg can be found at <a href="https://github.com/stenzek/duckstation/tree/master/scripts/deps">https://github.com/stenzek/duckstation/tree/master/scripts/deps</a>.<br />
-    FFmpeg sources can be downloaded from <a href="https://www.ffmpeg.org/download.html">https://www.ffmpeg.org/download.html</a>
+    FFmpeg sources can be downloaded from <a href="https://www.ffmpeg.org/download.html">https://www.ffmpeg.org/download.html</a><br />
+    AppImage FFmpeg build is bundled with the following third-party libraries:
+    <ul>
+        <li>LAME (LGPL): <a href="https://lame.sourceforge.io/">https://lame.sourceforge.io/</a></li>
+        <li>libvpx (BSD 3-Clause): <a href="https://www.webmproject.org/tools/">https://www.webmproject.org/tools/</a></li>
+        <li>FDK-AAC (Custom): <a href="https://gitlab.freedesktop.org/wtaymans/fdk-aac-stripped/">https://gitlab.freedesktop.org/wtaymans/fdk-aac-stripped/</a></li>
+        <li>libaom (BSD 2-Clause): <a href="https://aomedia.googlesource.com/aom/">https://aomedia.googlesource.com/aom/</a></li>
+        <li>libogg (BSD 3-Clause): <a href="https://xiph.org/downloads/">https://xiph.org/downloads/</a></li>
+        <li>libvorbis (BSD 3-Clause): <a href="https://xiph.org/vorbis/">https://xiph.org/vorbis/</a></li>
+        <li>libtheora (BSD 3-Clause): <a href="https://xiph.org/downloads/">https://xiph.org/downloads/</a></li>
+        <li>libopus (BSD 3-Clause): <a href="https://opus-codec.org/">https://opus-codec.org/</a></li>
+        <li>FLAC (BSD 3-Clause): <a href="https://xiph.org/flac/index.html">https://xiph.org/flac/index.html</a></li>
+        <li>speex (BSD 3-Clause): <a href="https://www.speex.org/">https://www.speex.org/</a></li>
+        <li>AMF Headers (MIT): <a href="https://github.com/GPUOpen-LibrariesAndSDKs/AMF">https://github.com/GPUOpen-LibrariesAndSDKs/AMF</a></li>
+        <li>SVT-AV1: (BSD 3-Clause): <a href="https://gitlab.com/AOMediaCodec/SVT-AV1/">https://gitlab.com/AOMediaCodec/SVT-AV1/</a></li>
+    </ul>
 </p>
 <pre>
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