Last part of the Speex/RTP patch - fixes #1291

src/audio_output/dec.c

@@ -86,7 +86,12 @@ static aout_input_t * DecNew( vlc_object_t * p_this, aout_instance_t * p_aout,
 
     p_input->b_changed = 0;
     p_input->b_error = 1;
-    aout_FormatPrepare( p_format );
+
+    if ( !p_format->i_bytes_per_frame )
+        aout_FormatPrepare( p_format );
+    else 
+        p_format->i_frame_length = 1;
+
     memcpy( &p_input->input, p_format,
             sizeof(audio_sample_format_t) );
     if( p_replay_gain )