Recompress audio; why?

Dennyboy wrote on 3/15/2009, 10:03 AM

I loaded an uncompressed NTSC AVI file, 48k stereo 16-bit audio into DVD Architect 5.0 and chose PCM audio for the project settings (in all locations). When I went to Optimize, I noticed a message that said the audio would be recompressed because it did not match the required settings for the disc (SD DVD). Any idea if this is a bogus message or why DVD-A would want to recompress the audio, which is in excatly the right format?
I went ahead and ran the job, then when I looked at the VOB file for the movie, Vegas said both the audio and video were MPEG2 - so I really can't tell what is going on.
Thanks for any help.
Dennis

Comments

bStro wrote on 3/15/2009, 1:11 PM

DVDA likes to get the audio as a separate file. If you give it an AVI with the audio muxed in, it has to de-mux the file and re-encode the audio even if it matches the final output format. Go back to Vegas and render the audio to its own WAV file. Then replace the audio stream in DVDA with that file (for example, but deleting it from the DVDA timeline and dragging the new WAV file there.

I went ahead and ran the job, then when I looked at the VOB file for the movie, Vegas said both the audio and video were MPEG2 - so I really can't tell what is going on.

Vegas must be mistaken. DVD Architect cannot and will not output MPEG audio. The resulting VOB contains either Dolby Digital AC3 or PCM wave audio.

Rob

Dennyboy wrote on 3/18/2009, 8:40 PM

Thanks for the help. I usually use Vegas to make my AC3 files so I have the extra parameters (turning off attenuation, for example), if going that route. But I get it that I have to use a separate WAV file for PCM.
thanks again.
D.