How do I reassemble Mpeg1 video to audio without recompressing the video?

Hi! Is there a way I could reassemble video and audio from a Mpeg1 that I now have separate in .m1v and .m1a files without recompressing video and loosing one "generation"? I had to change the audio in a Mpeg1 file, so I demuxed it, worked with the audio, and now I am looking to get the Mpeg1 again (could use Cleaner or Compressor) but I think these are going to recompress the video in order to tie it to the audio... Please help! 😱

So... there is really no way to add an audio track to my "silent" mpeg1 without having to recompress the video part again? Come on, guys! 🙂

... no way at all? 🙁 (last try)