Avoiding Audio Recompression

santiam wrote on 3/28/2014, 1:40 PM
I'm trying to prevent DVDA from recompressing audio. My video has AC3 256 kbps, 48 khz audio. I'm editing in MS 13 and sending it to DVDA.

I set the audio properties in DVDA to 256 kbps, but it keeps trying to recompress the audio. If I take the raw, unedited video clip and put it in DVDA, no audio recompression is required. So I think it has something to do with the settings in MS.

In MS, I used DVD Architect Template and included the audio stream (stereo 256kbps, 48 khz) in MS.

When rendering the AC3 audio stream separately, it looks like 192 kbps is the only option (it won't allow me to customize template).

Is there something else I'm missing?

Comments

vkmast wrote on 3/28/2014, 3:08 PM
>>>When rendering the AC3 audio stream separately, it looks like 192 kbps is the only option (it won't allow me to customize template).<<<
That's correct in Movie Studio.
Pls read the short rule of thumb advised by [I]musicvid[/i] here
"No, the steps are simple:"
Just tested this with your file and DVD A Studio did not recompress.
santiam wrote on 3/30/2014, 8:27 AM
So even if I include the audio at 256 kbps with the DVD-compliant video file in MS, DVDA will not recognize this as DVD-compliant AC3 audio? The only way to export DVD-compliant AC3 audio from MS to DVDA is a separate AC3 audio stream at 192 kbps. Is this correct?

If so, do you think it's better to downgrade the audio to 192 or try to maintain 256 with recompression? Thanks again.
Steve Mann wrote on 3/30/2014, 10:45 AM
If you send DVD compliant files to DVDA, it won't need to recompress. More specifically, if DVDA does recompress, then you have a mistake further upstream that DVDA is trying to fix for you.

That means MPEG2 video and AC3 audio in separate files.

If you include the audio in the video file (multiplexed), then DVDA has to demultiplex it then recomress it.
musicvid10 wrote on 3/30/2014, 11:45 AM
Santium,
I bet you didn't know about the Sony Knowledgebase:
http://www.custcenter.com/app/answers/detail/a_id/84/

There are a number of good reasons for requiring a separate compliant audio stream; having multiple audio tracks in your DVD being just one of them.

Best of luck.