Audio channel normalize

[fjhdavid]

Dear Jdobbs,

Do you plan in your next release to add the capability of changing audio gain channel level or apply normalization for DVD (as it is possible with mobile encoding), and delay correction?

DVD audio level are not always the same and you have to tweak the DVD player....

thanks
Francois

PS: I see two way to implement it:

1- access to Besweet which is free and very efficient (around 10mn to normalize a total film .ac3 file and which can find the best maximum gain automatically (two pass ac3 transcoding and NOT re-encoding))

2- allow the use of avisynth audio command on the .ac3 file

In both case the demux and final mux is already done with the DVD-RB soft

[steptoe]

Do you mean this :

http://avisynth.org/mediawiki/Normalize

But the snag is it still needs manual effort by you, but I know what you mean

I believe it is on the wishlist thats slowly being worked on, but isn't that much of a priority, but you are not the only one that complains how quiet the audio tracks on on the majority of DVDs

Maybe they do it so low, so then people won't moan that the audio is clipping and distorted on xxxxx DVD player, more a case of being over cautious by the DVD producers

[jdobbs]

Dear Jdobbs,

Do you plan in your next release to add the capability of changing audio gain channel level or apply normalization for DVD (as it is possible with mobile encoding), and delay correction?

DVD audio level are not always the same and you have to tweak the DVD player....

thanks
Francois

PS: I see two way to implement it:

1- access to Besweet which is free and very efficient (around 10mn to normalize a total film .ac3 file and which can find the best maximum gain automatically (two pass ac3 transcoding and NOT re-encoding))

2- allow the use of avisynth audio command on the .ac3 file

In both case the demux and final mux is already done with the DVD-RB soft Right now DVD-RB doesn't reencode audio at all. It is kept intact and reintegrated during REBUILD. So there really is no opportunity to normalize or amplify without a lot of code rewrites.

As an interesting aside, this is one of those things I've always found amusing about people's preconceived idea of sound. I've gotten problem reports from people before that says they didn't like the way the audio had degraded in the REBUILD... even though it was the exact same bit-for-bit audio that was on the original disc. One guy even told me he was an "audio expert" and didn't believe me. I had him demux both from the copy and original and do a compare. They matched of course. I see the same discussions related to DD compared to DTS, and 448Kbs compared to 640Kbs today. People always hear what they want to hear... regardless of the facts. :)

[fjhdavid]

Jdobbs I agree with you completely, in fact when I recorded my DVDs I made a mistake and my sound is 10 dB lower as it should be for my hundreds of DVD ! I know that the sound is left intact.

Is there a way to find the .ac3 and.d2v files somewhere on the hard drive after DVD-RB demux and encode, then I will be able to work on the .ac3 file with Besweet and re-author the whole thing with rejig without to have to demux everything from the beginning?

Thanks

[jdobbs]

It isn't extracted. It is read directly from the original VOB files and multiplexed back into the output VOB along with the new video.

[blutach]

I know it's low priority, especially when compared to getting BDRB finalised, but some DVDs have just atrociuos audio tracks which do need some manipulation. The answer, fjhdavid, is to do some "preprocessing" (I know it is bad, but what's a guy to do?). Demux from the original rip, process in BeSweet or whatever, remux and feed that to DVDRB. I am sure this is what you do anyway.

Regards