Write first_audio correctly.

diff --git a/src/lib/ffmpeg_content.cc b/src/lib/ffmpeg_content.cc
index bacc3183cafe909a459c2f213737fcbdbaf8a7f1..487325d71b152245af66534e19537812bae950bd 100644 (file)
--- a/src/lib/ffmpeg_content.cc
+++ b/src/lib/ffmpeg_content.cc
@@ -311,7 +311,7 @@ FFmpegAudioStream::as_xml (xmlpp::Node* root) const
        root->add_child("FrameRate")->add_child_text (lexical_cast<string> (frame_rate));
        root->add_child("Channels")->add_child_text (lexical_cast<string> (channels));
        if (first_audio) {
-               root->add_child("FirstAudio")->add_child_text (lexical_cast<string> (first_audio));
+               root->add_child("FirstAudio")->add_child_text (lexical_cast<string> (first_audio.get ()));
        }
        mapping.as_xml (root->add_child("Mapping"));
 }