Using the MUX option with subtitles?

[Alexius]

Let's say I demuxed a MKV file into a .264 file (H.264), a .OGG audio track, and a .ASS subtitle track. Through the options menu in ffmpegx, there is an option to MUX a file, yet no ability to mux in a subtitles track? Is there another way to do this?

Edit: Heh. I think I see a solution; is it possible to mux the audio and video together (to DVD, but not author it yet), and then author that file with the subtitles track? The only problem I'm getting however, is during the muxing process:

FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
  configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
  libavutil version: 49.0.0
  libavcodec version: 51.9.0
  libavformat version: 50.4.0
  built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
Input #0, ogg, from '/Volumes/Resonance/Videos/Conversion Outputs/01.ogg':
  Duration: 00:23:44.7, start: 0.000000, bitrate: 114 kb/s
  Stream #0.0: Audio: vorbis, 48000 Hz, stereo, 128 kb/s
Output #0, mp2, to '/Volumes/Resonance/Videos/Conversion Outputs/01.ogg.mp2':
  Stream #0.0: Audio: mp2, 48000 Hz, stereo, 224 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
video:0kB audio:38960kB global headers:0kB muxing overhead 0.000000%
   INFO: [mplex] mplex version 1.9.0 (2.2.7 $Date: 2006/02/01 22:23:01 $)
**ERROR: [mplex] File /Volumes/Resonance/Videos/Conversion Outputs/01.h264 unrecogniseable!
   INFO: [mplex] File /Volumes/Resonance/Videos/Conversion Outputs/01.ogg.mp2 looks like an MPEG Audio stream.
**ERROR: [mplex] Unrecogniseable file(s)... exiting.

Any ideas why it isn't identifying the h.264 file?

~Alexius

[Case]

To mux for DVD, you will first have to have DVD compliant elementary streams, which .h264 and .ogg are not.
> .m1v or .m2v with .ac3 or .mp2.