Editing Audio on a DVD and re-encoding (muxman gives an error)

[Hulkmanche]

Hi,

I'm trying to edit the audio in a particular scene on a movie I have. I did some research and figured out how to do what I wanted, but got stuck when I ran into an error with Muxman.

Here's what I've done so far:

1. Used PGCDemux to remove the audio from the video. This gave me an AC3 file.
2. Used BeSweet (with BeSweetGUI) to convert the AC3 to WAV.
3. Used Audacity to open the 6-channel WAV file and edit the audio in the part I wanted to.
4. Saved them out as 6 individual WAV files for each channel.
5. Used BeSweet (with BeSweetGUI) to convert the 6 WAV files back into an AC3 file.

Now, I have the same video file that PGCDemux created and a new AC3 file.

I tried to use Muxman to combine the new audio with the old video, but I'm getting an error saying that the bitrate is not 48kHz. I can't remember the exact error as I'm at work at the moment, but just wondering if any of you have an idea about what I might be doing wrong.

Edit: here's the exact error from Muxman's log file in c:\muxman.log:

MuxMan version 0.16.6
AC3 not 48K samples/second

Thanks for any help you can provide!

[minidv2dvd]

was besweet set to 41.1 or 48khz when you re-encoded the audio? it also has a bad rep for making non-compliant ac3 files anyway.

[manono]

Yeah, apparently in the process of converting either from AC3 to WAV or from WAV back to AC3 you changed the sample rate. DVD requires that it be 48 kHz.

[poisondeathray]

The audacity beta can edit and export AC3 directly, you just have to set it up in the preferences (ffmpeg) , but I would use avisynth+aften for slightly better quality and complete compatibility

[borax]

And audacity converts the bitrate automatically during exporting to the current active project bit rate.

[Hulkmanche]

Thanks for the tips - it does seem that my AC3 file was 44.1 kHz. I used ImagoMPEG-Muxer to remux the files and it seemed to work. I've now got my .VOB files again segmented in 1GB pieces. Playing the .VOB files in Media Player Classic seems to work and the edited audio is there! Do I need to go back and re-edit the WAV files to be 48KHz.... or does the fact that it plays correctly in the .VOB file mean that everything is okay? Will it play fine on my dvd player (my PS3)?

Also, I now have a VIDEO_TS folder with a bunch of .VOB, .BUP and .IFO files. The files add up to 7.8GB. So, do I need to go buy a Dual-Layer DVD-R to burn this? I would rather not use DVDShrink to reduce the size because of quality concerns... will I notice the quality difference?

Thanks for helping out a newbie everyone!

Edit: removed question about my dvd burner... I found out that it supports dual-layer burning.

[manono]

Do I need to go back and re-edit the WAV files to be 48KHz.... or does the fact that it plays correctly in the .VOB file mean that everything is okay?

Imago is an MPEG muxer, and not a DVD muxer. The fact that it muxed and plays doesn't mean it's DVD compliant. If you want it compliant so it plays in all players then, yes, you should go back and convert the audio to 48 kHz. And then use a real DVD muxer, one such as Muxman. It never would have accepted your 44.1 kHz AC3 audio file. I don't know how it'll do in the PS3. Maybe it'll play, I don't know.

So, do I need to go buy a Dual-Layer DVD-R to burn this?

Yes. But I think it's the Verbatim dual layer +Rs that are recommended. Someone else can elaborate or correct me if need be.

I would rather not use DVDShrink to reduce the size because of quality concerns... will I notice the quality difference?

That might depend on the quality of your TV set. On a good HDTV, you'll probably be able to tell the difference. If you want to shrink it down to DVD5 size, use an encoder and not a transcoder like DVD Shrink. DVD-Rebuilder can do the job well.